Journal of Advanced Ceramics最新文献_第2页

Tailoring sulfur/nitrogen co-doping configuration in MXene nanoribbon/nanosheet composite for high-performance electromagnetic wave absorption 在MXene纳米带/纳米片复合材料中定制硫/氮共掺杂配置，用于高性能电磁波吸收

Journal of Advanced Ceramics Pub Date : 2025-11-14 DOI: 10.26599/jac.2025.9221209

Zhenrong Cui, Xufeng Li, Haoying Zhang, Guanyu Han, Ming Fang, Yan Wang, Xinyu Fang, Yan Lu, Qi Yan, Ronghai Yu, Jianglan Shui, Xiaofang Liu

{"title":"Tailoring sulfur/nitrogen co-doping configuration in MXene nanoribbon/nanosheet composite for high-performance electromagnetic wave absorption","authors":"Zhenrong Cui, Xufeng Li, Haoying Zhang, Guanyu Han, Ming Fang, Yan Wang, Xinyu Fang, Yan Lu, Qi Yan, Ronghai Yu, Jianglan Shui, Xiaofang Liu","doi":"10.26599/jac.2025.9221209","DOIUrl":"https://doi.org/10.26599/jac.2025.9221209","url":null,"abstract":"Transition metal carbides (MXenes) as electromagnetic wave absorption materials face two critical challenges of impedance mismatch caused by high conductivity and the easy restacking and agglomeration of ultrathin nanosheets. To address these issues, this study proposes the construction of a sulfur/nitrogen (S/N) co-doped MXene nanoribbon/nanosheet composite structure. An alkali-assisted chemical scissor strategy was used to successfully prepare a nanoribbon/nanosheet hybrid, which effectively suppressed nanosheet stacking and significantly increased active interfaces and defect sites. By controlling the doping temperature, precise regulation of the doping configurations of S and N elements in MXene is achieved, including lattice substitution (LS), functional group substitution (FS) and surface absorption (SA). With increasing doping temperature, the configuration of S/N dopants evolves from a combination of FS-type N and LS-type S to a coexistence of SA- and LS-type species. The former synergistically enhances conductive loss and polarization loss, while the latter suppresses electron transport and consequently reduces the complex permittivity of the material. The optimized composite exhibits considerably improved comprehensive electromagnetic wave-absorption performance at a low filler loading (10 wt%) and a thin thickness (1.26 mm), achieving a minimum reflection loss (RLmin) of -53.77 dB and an effective absorption bandwidth (EAB) of 4.51 GHz. This work not only clarifies the regulation mechanism of doping configurations on high-frequency electromagnetic properties, but also provides a theoretical foundation for the rational design of high-performance MXene-based electromagnetic wave absorbing materials.","PeriodicalId":502524,"journal":{"name":"Journal of Advanced Ceramics","volume":"14 12","pages":"9221209-9221209"},"PeriodicalIF":0.0,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciopen.com/article_pdf/1989250751353376770.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147334074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Liquid metal modified hexagonal boron nitride flakes for efficient electromagnetic wave absorption and thermal management 液态金属改性六方氮化硼片的高效电磁波吸收和热管理

Journal of Advanced Ceramics Pub Date : 2025-11-14 DOI: 10.26599/jac.2025.9221208

Yibing Lin, Kaixuan Yu, Bo Zhong, Haoyu Deng, Chaoli Ma, Jilin Wang, Yuanlie Yu

{"title":"Liquid metal modified hexagonal boron nitride flakes for efficient electromagnetic wave absorption and thermal management","authors":"Yibing Lin, Kaixuan Yu, Bo Zhong, Haoyu Deng, Chaoli Ma, Jilin Wang, Yuanlie Yu","doi":"10.26599/jac.2025.9221208","DOIUrl":"https://doi.org/10.26599/jac.2025.9221208","url":null,"abstract":"The rapid advancement of lightweight and high-power electronic devices has brought about increasingly aggravated issues of electromagnetic wave (EMW) interference and heat accumulation, which severely threaten the stability and service life of the devices. To address these challenges, we propose a simple and scalable mechanochemical strategy to activate hexagonal boron nitride flakes (BNFs) using liquid metal (LM), enduing BNFs outstanding EMW absorption and high thermally conductive capabilities. This facile modification approach avoids multi-step reactions, large solvent consumption, and high energy input, while simultaneously introducing abundant interfacial polarization centers, and electron and heat transfer pathways, thus optimizing EMW absorption and thermally conductive performances of BNFs. Consequently, the optimized BNF@LM composites exhibit remarkable EMW absorption with a minimum reflection loss of -48.4 dB and an effective absorption bandwidth of 5.76 GHz. Besides, coupling the BNF@LM composites with aramid nanofibers (ANFs) can impart the ANF based films with good thermal conductivity and flexibility, making them suitable for flexible electronics. Typically, the BNF@LM/ANF films can reach a thermal conductivity of 0.54 W m-1 K-1 measured by hot wire method, nearly 5 times higher than that of ANF film (0.10 W m-1 K-1). Moreover, the BNF@LM/ANF films can effectively attenuate incident EMW and exhibit remarkable flame retardancy, endowing them with strong adaptability to extreme environments.","PeriodicalId":502524,"journal":{"name":"Journal of Advanced Ceramics","volume":"14 12","pages":"9221208-9221208"},"PeriodicalIF":0.0,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciopen.com/article_pdf/1989145141093912577.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147333679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Engineering impedance-matched double-shells in hollow Co/carbon microspheres with gradient graphitization for high-efficiency electromagnetic wave absorption 具有梯度石墨化的空心Co/碳微球的工程阻抗匹配双壳，用于高效电磁波吸收

Journal of Advanced Ceramics Pub Date : 2025-11-14 DOI: 10.26599/jac.2025.9221212

Lixue Gai, Yongzheng Chen, Yan Wang, Xijiang Han, Ping Xu, Yunchen Du

{"title":"Engineering impedance-matched double-shells in hollow Co/carbon microspheres with gradient graphitization for high-efficiency electromagnetic wave absorption","authors":"Lixue Gai, Yongzheng Chen, Yan Wang, Xijiang Han, Ping Xu, Yunchen Du","doi":"10.26599/jac.2025.9221212","DOIUrl":"https://doi.org/10.26599/jac.2025.9221212","url":null,"abstract":"The inherent trade-off between impedance matching and electromagnetic (EM) attenuation capability has long been a fundamental limitation in carbon-based materials, hindering further advances in their EM absorption performance. To overcome this challenge, we innovatively design hollow double-shell Co/carbon microspheres with a gradient graphitization structure, where Co3O4 nanoparticles pre-anchored on melamine formaldehyde microspheres can induce the formation of graphitic inner shells during high-temperature pyrolysis, and nevertheless, the outer carbon shells remain amorphous nature due to the lack of Co-relate species, ultimately resulting in a gradient graphitization from the inside out. This unique double-shell architecture combines the advantages of both gradient graphitization and hollow structure, favorable for powerful EM attenuation and impedance matching at the same time. EM analyses reveal that the outer amorphous carbon shells not only play a key role in optimizing impedance matching, but also create heterogeneous interfaces with the inner graphitic shells to enhance interfacial polarization. As a result, the as-prepared sample achieves a superior reflection loss of -62.9 dB, and its maximum effective absorption bandwidth (EABmax) can be extended to 11.3 GHz through a rationally designed multilayer structure, significantly surpassing non-gradient counterparts. Computer simulation technology (CST) simulations further verify a remarkable radar cross-section (RCS) reduction of 22.3 dBm². This work provides an effective strategy for reconciling the conflict between impedance matching and attenuation in carbon-based materials, and also demonstrates their great potential as lightweight and broadband EM wave absorbing materials in the future.","PeriodicalId":502524,"journal":{"name":"Journal of Advanced Ceramics","volume":"14 12","pages":"9221212-9221212"},"PeriodicalIF":0.0,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciopen.com/article_pdf/1989296362035400706.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147886532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Vacancy-mediated electromagnetic loss tuning in Cr-doped lanthanum manganite perovskites for broadband and high-intensity microwave absorption cr掺杂镧锰矿钙钛矿的空介导电磁损耗调谐用于宽带和高强度微波吸收

Journal of Advanced Ceramics Pub Date : 2025-11-08 DOI: 10.26599/jac.2025.9221202

Shu-Qing Lv, Yanjun Jiang, Muyao Liu, Jingao Li, Zihao Zhao, Xinyu Wang, Baoshan Li, Shuo Liu, Fangzhou Cui, Dongdong Lv, Yanan Yang, Long Xia

{"title":"Vacancy-mediated electromagnetic loss tuning in Cr-doped lanthanum manganite perovskites for broadband and high-intensity microwave absorption","authors":"Shu-Qing Lv, Yanjun Jiang, Muyao Liu, Jingao Li, Zihao Zhao, Xinyu Wang, Baoshan Li, Shuo Liu, Fangzhou Cui, Dongdong Lv, Yanan Yang, Long Xia","doi":"10.26599/jac.2025.9221202","DOIUrl":"https://doi.org/10.26599/jac.2025.9221202","url":null,"abstract":"Escalating electromagnetic pollution and advanced stealth technologies require next-generation microwave absorbers that combine broadband response, strong attenuation, and lightweight characteristics with high-temperature stability. In this work, a vacancy-mediated strategy is proposed to tailor electromagnetic losses in Cr-doped lanthanum manganite perovskites (LaMn1-xCrxO3) synthesized by a sol–gel method. The cooperative modulation between Mn-site cation vacancies and oxygen vacancies enables a well-balanced contribution of polarization loss and conduction loss, resulting in excellent absorption performance. Specifically, LaMn0.85Cr0.15O3 achieves a remarkable minimum reflection loss of -75.37 dB and an effective absorption bandwidth of 6.0 GHz at a thickness of only 2.8 mm. Structural and spectroscopic analyses reveal that Cr3+ substitution induces Mn vacancies and modulates oxygen vacancy concentrations, thereby generating defect dipoles and facilitating carrier migration. Density functional theory calculations further elucidate the role of Cr-induced defect states in enhancing conduction and polarization losses. This vacancy-engineered approach not only establishes a new paradigm for designing high-efficiency perovskite-based microwave absorbers but also offers significant potential for high-temperature electromagnetic compatibility applications.","PeriodicalId":502524,"journal":{"name":"Journal of Advanced Ceramics","volume":"14 12","pages":"9221202-9221202"},"PeriodicalIF":0.0,"publicationDate":"2025-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciopen.com/article_pdf/1987062219666952193.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147908849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Hierarchical interface-engineered magnetic graphene‒SiCN aerogels via a stepwise confinement strategy for low-frequency and broadband microwave absorption 分层界面工程磁石墨烯- sicn气凝胶通过逐步限制策略低频和宽带微波吸收

Journal of Advanced Ceramics Pub Date : 2025-10-04 DOI: 10.26599/jac.2025.9221187

Gaoyuan Yu, Gaofeng Shao, Zhijun Xu, Yu Chen, Xiaogu Huang

{"title":"Hierarchical interface-engineered magnetic graphene‒SiCN aerogels via a stepwise confinement strategy for low-frequency and broadband microwave absorption","authors":"Gaoyuan Yu, Gaofeng Shao, Zhijun Xu, Yu Chen, Xiaogu Huang","doi":"10.26599/jac.2025.9221187","DOIUrl":"https://doi.org/10.26599/jac.2025.9221187","url":null,"abstract":"Heterogeneous interface engineering is key to tailoring intrinsic electromagnetic wave (EMW) attenuation. However, fully harnessing the functional benefits of these interfaces requires precise control of their architecture—a major challenge in hierarchical heterostructure design. Herein, a stepwise confinement strategy is proposed to in situ construct hierarchical heterogeneous interfaces within graphene aerogels, incorporating ZIF-67 nanoparticles and a polysilazane nanolayer embedding ZIF-67. Through synchronous thermal decomposition of magnetic metal and ceramic precursors, Co/CoO nanocrystals and amorphous SiCN nanolayer are uniformly anchored onto the reduced graphene oxide (rGO) framework, creating hierarchically organized heterogeneous interfaces that comprise both nanoscale zero-dimensional (0D)–2D assemblies, such as ZIF-67-derived Co/CoO nanocrystals anchored on SiCN or rGO sheets, and extended 2D–2D contacts between SiCN and rGO layers. These engineered heterointerfaces may induce inhomogeneous spatial charge distribution, which in turn enhances interfacial polarization. Benefiting from synergistic magnetic–dielectric loss, and improved impedance matching, the optimized magnetic graphene-SiCN aerogel achieves a minimum reflection loss of −60.63 dB at a low frequency of 5.52 GHz and a broad effective absorption bandwidth of 7.89 GHz at a thickness of 2.4 mm. This work provides valuable insights into hierarchical heterostructure design and the fundamental electromagnetic response mechanisms governed by heterointerface engineering, paving the way for next-generation EMW absorbing materials.","PeriodicalId":502524,"journal":{"name":"Journal of Advanced Ceramics","volume":"14 12","pages":"9221187-9221187"},"PeriodicalIF":0.0,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://file.sciopen.com/sciopen_public/1974317154410434562.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147894873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 31

Intelligent design of multifunctional graphene-based aerogels for ultra-broadband microwave absorption 多功能石墨烯基超宽带微波吸收气凝胶的智能设计

Journal of Advanced Ceramics Pub Date : 2025-09-12 DOI: 10.26599/jac.2025.9221172

Xiaohan Wang, Ye Yuan, Leyao Wang, Xianxian Sun, Tieliang Zhang, Chi Liu, Yibin Li

{"title":"Intelligent design of multifunctional graphene-based aerogels for ultra-broadband microwave absorption","authors":"Xiaohan Wang, Ye Yuan, Leyao Wang, Xianxian Sun, Tieliang Zhang, Chi Liu, Yibin Li","doi":"10.26599/jac.2025.9221172","DOIUrl":"https://doi.org/10.26599/jac.2025.9221172","url":null,"abstract":"The growing demand for microwave absorbing materials to mitigate electromagnetic pollution has driven the exploration of efficient design strategies. However, traditional experimental approaches for optimizing multi-component and multilayer structures are time-consuming. To rapidly predict and optimize the electromagnetic parameters of microwave absorbing materials, a machine learning-assisted design framework has been proposed. A series of graphene/SiO2 and graphene/BaTiO3 aerogels were prepared using electrospinning technology, and their electromagnetic parameter datasets were used to train a machine learning model. The model achieved a maximum prediction accuracy of 97.3%, significantly accelerating the design process. By integrating the predicted parameters into simulation software, gradient impedance structures were rapidly designed, yielding multifunctional aerogels with an ultra-wideband absorption range of 3.26–17.30 GHz at a thickness of 20 mm. Compared to conventional methods, this machine learning strategy reduces the research cycle to mere weeks, enabling the fast and efficient design of high-performance absorbing materials. Additionally, the aerogel demonstrated excellent thermal insulation and soundproofing capabilities, underscoring its multifunctionality. This study demonstrates the potential of machine learning in accelerating the development of next-generation microwave absorbing materials.","PeriodicalId":502524,"journal":{"name":"Journal of Advanced Ceramics","volume":"14 12","pages":"9221172-9221172"},"PeriodicalIF":0.0,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147332047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Rational high-entropy doping strategy via modular in situ /post solvothermal doping integration for microwave absorption 基于模块化原位/后溶剂热掺杂集成的微波吸收高熵掺杂策略

Journal of Advanced Ceramics Pub Date : 2025-09-07 DOI: 10.26599/jac.2025.9221168

Yuefeng Yan, Ziyan Cheng, Tao Chen, En Zhou, Boshi Gao, Guangyu Qin, Guansheng Ma, Xiaoxiao Huang

{"title":"Rational high-entropy doping strategy via modular in situ /post solvothermal doping integration for microwave absorption","authors":"Yuefeng Yan, Ziyan Cheng, Tao Chen, En Zhou, Boshi Gao, Guangyu Qin, Guansheng Ma, Xiaoxiao Huang","doi":"10.26599/jac.2025.9221168","DOIUrl":"https://doi.org/10.26599/jac.2025.9221168","url":null,"abstract":"Doping strategies have been widely demonstrated as an effective approach to tailor microwave absorption properties in various material systems. However, achieving high-entropy doping (HED) in MoS2 while minimizing phase ratio interference, effectively integrating multiple transition metal elements substitution, and elucidating the underlying absorption mechanisms remains a significant challenge. In this work, we develop a modular in-situ/post-solvothermal doping process to realize the cooperative incorporation of multiple dopants into the 1T-MoS₂ host. For the first time, we systematically investigate the effects of multi-element co-doping, including high density lattice strain, crystalline defects, localized charge accumulation and redistribution, which significantly enhance dipole polarization loss. Benefiting from the balanced impedance characteristics and coordinated polarization/conductive losses enabled by HED engineering, the WVNbTaRu-MoS2 sample achieves a broadband effective absorption bandwidth of 7.65 GHz, which is more than double that of undoped counterparts. Through combinatorial screening, we proposed 31 feasible doping configurations and experimentally validate 9 variants, establishing a foundational framework for designing advanced MoS2 based absorbers with tailored electromagnetic properties. This study provides innovative insights and pathways for rational design of high performance transition metal dichalcogenide based microwave absorbers.","PeriodicalId":502524,"journal":{"name":"Journal of Advanced Ceramics","volume":"14 10","pages":"9221168-9221168"},"PeriodicalIF":0.0,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://file.sciopen.com/sciopen_public/1964700402114363393.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147901738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Electromagnetic collaborative optimization of DyFe-MOFs derivatives for ultra-thin electromagnetic wave absorption 超薄电磁波吸收dyfe - mof衍生物的电磁协同优化

Journal of Advanced Ceramics Pub Date : 2025-08-28 DOI: 10.26599/jac.2025.9221163

Xiaoli Wang, Juhua Luo, S J Mao, Daqing Cheng, Xing Liu, Yu Xie, Lichun Cheng

{"title":"Electromagnetic collaborative optimization of DyFe-MOFs derivatives for ultra-thin electromagnetic wave absorption","authors":"Xiaoli Wang, Juhua Luo, S J Mao, Daqing Cheng, Xing Liu, Yu Xie, Lichun Cheng","doi":"10.26599/jac.2025.9221163","DOIUrl":"https://doi.org/10.26599/jac.2025.9221163","url":null,"abstract":" Achieving high-performance electromagnetic wave absorption (EMWA) capacity at thinner thickness remains a critical yet challenging objective. In this study, Dy2O3/Fe3C/N-doped carbon (DFC) composites were synthesized via a solvothermal process followed by high-temperature carbonization, using metal-organic frameworks (MOFs) as precursors. By systematically adjusting the molar ratio of Dy3+/Fe3+, the dielectric and magnetic properties of the materials were synergistically optimized. The EMWA performance exhibited a non-monotonic dependence on Dy³⁺ content, firstly improving before declining at higher concentrations. At an optimal Dy3+/Fe3+ molar ratio of 1.2:0.8, the DFC composites demonstrated a remarkable minimum reflection loss value of -56.08 dB at a mere 1.76 mm thickness, alongside an effective absorption bandwidth value of 5.12 GHz (12.56-17.68 GHz). The exceptional EMWA performance stems from optimized impedance matching, multiple scattering and reflections, dielectric loss, and magnetic loss. Furthermore, radar cross-section simulations validated the material’s practical applicability. Therefore, this work provided a novel strategy for designing next generation EMWA materials with ultra-thin profiles and wideband absorption capabilities. ","PeriodicalId":502524,"journal":{"name":"Journal of Advanced Ceramics","volume":"14 12","pages":"9221163-9221163"},"PeriodicalIF":0.0,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147889710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Interface-engineered decoupled conductivity and relaxation: Synergistic modulation of Debye-parameters in N-doped SiO ₂ /MXene broadband wave-absorbing materials 界面工程解耦电导率和弛豫：n掺杂sio2 /MXene宽带吸波材料中debye参数的协同调制

Journal of Advanced Ceramics Pub Date : 2025-08-04 DOI: 10.26599/jac.2025.9221150

Yunfei He, Dongdong Liu, Sihao Dou, Long Ma, Dan Zhang, Minghao Yang, Bo Zhong, Long Xia, Xiaoxiao Huang

{"title":"Interface-engineered decoupled conductivity and relaxation: Synergistic modulation of Debye-parameters in N-doped SiO 2 /MXene broadband wave-absorbing materials","authors":"Yunfei He, Dongdong Liu, Sihao Dou, Long Ma, Dan Zhang, Minghao Yang, Bo Zhong, Long Xia, Xiaoxiao Huang","doi":"10.26599/jac.2025.9221150","DOIUrl":"https://doi.org/10.26599/jac.2025.9221150","url":null,"abstract":"The development of Ti3C2Tx MXene-based electromagnetic wave-absorbing materials faces a persistent challenge in balancing conductivity loss and polarization relaxation. To resolve this conflict, we propose an \"interface engineering - Human-Computer Interaction (HCI)\" strategy to regulate the evolution of permittivity and decouple the interdependency between conductivity (σ) and relaxation time (τ). First, by integrating the Debye relaxation model and transmission line theory into Python-based interactive modules, an HCI framework is established that quantitatively guides the optimization of permittivity trends and provides feedback on intrinsic Debye-parameter variations. Subsequently, guided by these theoretical optimizations, nitrogen-doped SiO2-coated Ti3C2Clx MXene composites (SMX) are prepared via interface engineering. The insulating SiO2 layer suppresses excessive σ while introducing heterogeneous interfaces that prolong τ. Meanwhile, the surface heterogeneous dipole generated by nitrogen-doping induces a hysteresis of τ. Consequently, this theory-guided design enables the optimized SMX-S2-N1 to achieve a 5.2 GHz effective absorption bandwidth, overcoming the inherent limitation of narrow absorption bandwidth in MXene single-component materials. This study not only addresses the restricted absorption bandwidth of monolithic MXenes but also offers a mechanistic understanding of dielectric loss through Debye model analysis, bridging semi-empirical design principles with theoretical frameworks. ","PeriodicalId":502524,"journal":{"name":"Journal of Advanced Ceramics","volume":"14 12","pages":"9221150-9221150"},"PeriodicalIF":0.0,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sciopen.com/article_pdf/1952193025632935938.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147333793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Realizing negative thermal expansion over an extended temperature range in PbTiO ₃-based perovskites 在扩展的温度范围内实现pbtio3基钙钛矿的负热膨胀

Journal of Advanced Ceramics Pub Date : 2025-05-19 DOI: 10.26599/jac.2025.9221096

Zhao Pan, Fengyi Zhou, Mengqi Ye, Duo Wang, Qiumin Liu, Takumi Nishikubo, Xubin Ye, Xiao Wang, Jin Liu, Nianpeng Lu, Shogo Kawaguchi, Masaki Azuma, Youwen Long

{"title":"Realizing negative thermal expansion over an extended temperature range in PbTiO 3-based perovskites","authors":"Zhao Pan, Fengyi Zhou, Mengqi Ye, Duo Wang, Qiumin Liu, Takumi Nishikubo, Xubin Ye, Xiao Wang, Jin Liu, Nianpeng Lu, Shogo Kawaguchi, Masaki Azuma, Youwen Long","doi":"10.26599/jac.2025.9221096","DOIUrl":"https://doi.org/10.26599/jac.2025.9221096","url":null,"abstract":"Negative thermal expansion (NTE) is fascinating as it involves a material’s volume contraction rather than expansion upon heating. Although NTE lattices typically have highly flexible frameworks, the magnitude of NTE is often very small, and they frequently behave a narrow temperature range for controllable NTE. It remains a great challenge to achieve large NTE while maintaining a wide temperature operation range from the currently available materials. Herein, we present a novel PbTiO3-based perovskite system, (1-x)PbTiO3-xBiYbO3, synthesized using a distinctive high-pressure and high-temperature technique. The system exhibits an unusual enhanced tetragonalities compared to pristine PbTiO3 (c/a = 1.064). Consequently, NTE over an extended temperature range has been realized in 0.95PbTiO3-0.05BiYbO3 (  = -2.18 ´ 10-5/K, 300 - 820 K) and 0.90PbTiO3-0.10BiYbO3 (  = -1.85 ´ 10-5/K, 300 - 850 K), respectively, when compared to that of pristine PbTiO3 (  = -1.99 ´ 10-5/K, 300 - 763 K). Our experimental and theoretical studies indicate that the improved tetragonality and the expanded NTE temperature range result from larger ionic displacements and an enhanced asymmetric charge distribution, both induced by the BiYbO3 substitution. The present study presents a new instance of NTE across a broad temperature range, highlighting its potential as an effective thermal expansion compensator.","PeriodicalId":502524,"journal":{"name":"Journal of Advanced Ceramics","volume":"14 7","pages":"9221096-9221096"},"PeriodicalIF":0.0,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sciopen.com/article_pdf/1924372076363878401.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147906776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3