Journal of the American Ceramic Society最新文献_第4页

Atmosphere-Dependent Laser Ablation Behavior and Graphitization of Diamond With Different Crystallographic Orientations 不同晶体取向金刚石的大气相关激光烧蚀行为和石墨化

IF 4.2 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-08-26 DOI: 10.1111/jace.71167

Shao-rong Bie, Yantao Gong, Ding-shun She

{"title":"Atmosphere-Dependent Laser Ablation Behavior and Graphitization of Diamond With Different Crystallographic Orientations","authors":"Shao-rong Bie, Yantao Gong, Ding-shun She","doi":"10.1111/jace.71167","DOIUrl":"https://doi.org/10.1111/jace.71167","url":null,"abstract":"<div>\u0000 \u0000 Laser ablation is an effective technique for fabricating microstructures on diamond surfaces; however, the influence of ambient atmosphere on the ablation behavior and surface chemistry remains insufficiently understood. In this study, nanosecond laser ablation experiments were performed on single-crystal diamond under different gaseous environments (O2, air, N2, He, and Ne). The ablation morphology, graphitization behavior, and surface chemical bonding were characterized using laser confocal microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The results show that the ambient atmosphere significantly affects the ablation efficiency and surface structure. Oxidizing atmospheres (O2 and Air) lead to higher material removal rates due to thermochemical oxidation reactions, while inert atmospheres (He and Ne) produce smoother groove edges and more uniform surfaces. Raman analysis indicates that the graphitization degree varies with atmosphere, with the intensity ratio of the D and G bands following the order N2 > Ne > He > Air > O2. XPS results reveal that oxidizing atmospheres increase the content of oxygen-containing bonds (C─O/C═O), whereas nitrogen and inert atmospheres favor the formation and accumulation of sp2 carbon.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148848939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the Feasibility of Stabilizing Tropical Soils Using an In Situ Synthesized One-Part Geopolymer Binder 原位合成单组分地聚合物粘结剂稳定热带土壤的可行性研究

IF 4.2 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-08-26 DOI: 10.1111/jace.71172

Juvenal Giogetti Deutou Nemaleu, Webster Sambo, Van Essa L. Kamga Samen, Takafumi Noguchi

{"title":"Investigation of the Feasibility of Stabilizing Tropical Soils Using an In Situ Synthesized One-Part Geopolymer Binder","authors":"Juvenal Giogetti Deutou Nemaleu, Webster Sambo, Van Essa L. Kamga Samen, Takafumi Noguchi","doi":"10.1111/jace.71172","DOIUrl":"https://doi.org/10.1111/jace.71172","url":null,"abstract":"<div>\u0000 \u0000 One of the prerequisites for achieving sustainable development is the design and production of materials that focus on energy-saving processes as well as environmentally and eco-friendly use of local raw materials, with engineering properties suitable for building constructions. This work offers an alternative way of enhancing the reactivity of tropical clayey soils for civil engineering purposes. This overcame the concerns raised over the use of the traditional alkaline binder for stabilization of soil: calcination of aluminosilicate materials and the harm related to managing and blending highly eroding and typically viscous alkali solutions. Numerous analytical techniques, including X-ray diffraction, infrared Fourier transformation (FT-IR), compressive strength (UCS), thermal gravimetric, and microstructural analysis, were used to assess the features of the produced stabilized clayey soils. The results demonstrated that the co-grinding process applied to blending mixed precursors and activating powders effectively integrated alkali cations into the precursor structure, ultimately resulting in the formation of a solid alternative binder. Moreover, at 28 days, the amorphous geopolymer phases, such as sodalite and hydroxysodalite, are found alongside primarily crystalline phases of clayey soils, such as nontronite, natrolite, kaolinite, and quartz. The in situ produced NASH-gel binder participated in closing spaces and voids, resulting in the densification of the stabilized clayey materials. The high values of compressive strength of 2.6 MPa were achieved and were at least three times as high as those made with unmilled soils. This eventually would add value to tropical earth-based materials through efficient use in the production of sustainable materials with excellent engineering performance.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148848942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Achieving High Quantum Efficiency in Fe3+-Doped Garnet for Multifunctional NIR Applications 在多功能近红外应用中实现Fe3+掺杂石榴石的高量子效率

IF 4.2 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-08-26 DOI: 10.1111/jace.71178

Guihua Li, Qihua Yang, Shujuan Zhao, Hanqi Wei, Zhiwei Luo, Gemei Cai, Martin Köckerling, Jingtai Zhao

{"title":"Achieving High Quantum Efficiency in Fe3+-Doped Garnet for Multifunctional NIR Applications","authors":"Guihua Li, Qihua Yang, Shujuan Zhao, Hanqi Wei, Zhiwei Luo, Gemei Cai, Martin Köckerling, Jingtai Zhao","doi":"10.1111/jace.71178","DOIUrl":"https://doi.org/10.1111/jace.71178","url":null,"abstract":"<div>\u0000 \u0000 Near-infrared (NIR) luminescent materials are urgently required in night-vision monitoring, biochemical sensing, and structural diagnostics fields. However, their practical applications are mainly hindered by low quantum efficiency. This study proposes a rational-design strategy that combines stiffness-oriented matrix selection and symmetry-driven efficiency tailoring to achieve extremely efficient Fe3+-activated phosphors. Via the evaluation of Debye temperature and band gap, Ca3Sc2Si3O12 garnet has been chosen as the matrix for Fe3+. Defect formation energy calculation helps to predict the optimal doping position of Fe in CSSO. Introducing to the Sc site in the robust Ca3Sc2Si3O12 host, Fe3+ achieves a NIR emission at 745 nm (4T1(4G)→6A1(6S) transition of Fe3+ in ScO6 octahedra) with an internal quantum efficiency (IQE = 96.1%) and external quantum efficiency (EQE = 53.7%). Structural and spectral analyses reveal that this remarkable performance originates from high-symmetry [ScO6] sites and extreme lattice rigidity (ΘD = 664.09 K). Furthermore, [Y–Mg] co-substitution at [Ca–Sc] sites enhances crystal field strength through crystal field engineering, enabling tunable emission from 745 to 810 nm. A prototype NIR lighting diode fabricated with Ca2.7Y0.3Sc1.7Mg0.3Si3O12:0.01Fe3+ phosphor demonstrates viability for multifunctional applications of plant lighting, bio-imaging, and night-vision applications.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148848941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Weld Reaction Characteristics During Direct Picosecond Laser Welding of Glass and Aluminum Alloy 玻璃与铝合金直接皮秒激光焊接焊缝反应特性

IF 4.2 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-08-26 DOI: 10.1111/jace.71165

Youting Gan, Shuye Zheng, Fei Yan, Yiyang Hu, Chunming Wang

{"title":"Weld Reaction Characteristics During Direct Picosecond Laser Welding of Glass and Aluminum Alloy","authors":"Youting Gan, Shuye Zheng, Fei Yan, Yiyang Hu, Chunming Wang","doi":"10.1111/jace.71165","DOIUrl":"https://doi.org/10.1111/jace.71165","url":null,"abstract":"<div>\u0000 \u0000 Joining aluminum alloys directly to glass without an intermediate layer is challenging due to the alloy's high thermal conductivity, strong chemical reactivity, and the large mismatch in thermal expansion coefficient with glass; moreover, the phase evolution during welding is complex. In this study, quartz glass and 6061-T6 aluminum alloy were successfully joined using a picosecond laser. With the single‑pulse energy fixed at 10 µJ, the effects of the number of incident pulses on the joint features were investigated. With a shear strength of 32.33 MPa, the optimal shear performance was achieved at 300 kHz. During joint formation, chemical metallurgical reactions between the glass and the metal produced new phases. Driven by vapor pressure and the Marangoni effect, the weld with layered characteristics in morphology and elemental distribution was formed. Adjacent to the metal side, the weld contained a metallic microstructure composed of polycrystalline Al, which reinforced the joint through mechanical interlocking. The interior of the weld comprised a phase mixing zone containing Al2O3, free Si, free Al, and crystalline SiO2, and these freely distributed phases exhibited an oblique drift from the metal side toward the glass side. Based on experimental observations, the mechanism of joint formation was summarized.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148849037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Y2O3-Doped Bi2O3–Y2O3-Stabilized ZrO2 Composite Ceramic Electrolytes Fabricated by Infiltration 渗透法制备y2o3掺杂bi2o3 - y2o3稳定ZrO2复合陶瓷电解质

IF 4.2 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-08-26 DOI: 10.1111/jace.71174

Selma Nur Büyükgöz, Sorour Semsari Parapari, Sašo Šturm, Mustafa Ünsal Ünver, Aligül Büyükaksoy

{"title":"Y2O3-Doped Bi2O3–Y2O3-Stabilized ZrO2 Composite Ceramic Electrolytes Fabricated by Infiltration","authors":"Selma Nur Büyükgöz, Sorour Semsari Parapari, Sašo Šturm, Mustafa Ünsal Ünver, Aligül Büyükaksoy","doi":"10.1111/jace.71174","DOIUrl":"https://doi.org/10.1111/jace.71174","url":null,"abstract":"To increase the ionic conductivity of the conventional solid oxide cell (SOC) electrolyte, yttria stabilized zirconia (YSZ), we propose to fabricate yttria-doped bismuth oxide—YSZ (YDB–YSZ) composite electrolytes by infiltrating liquid YDB precursor into porous YSZ scaffolds, followed by a heat treatment step. Comparing YDB–YSZ electrolytes fabricated via co-sintering of the respective powders and those by infiltration, after heat treatment at the same temperature, the latter consisted of monoclinic zirconia and cubic YSZ phases, yielding electrical conductivities even lower than the conventional YSZ. Meanwhile, YDB–YSZ fabricated via infiltration yielded an interconnected network of ionically conductive tetragonal bismuth oxide phase within the cubic YSZ matrix. Consequently, electrical conductivities ca. 2.5 times that of the single-phase YSZ was determined. The results obtained here suggest that YDB–YSZ composites are promising alternatives to single-phase YSZ as SOC electrolytes and infiltration is preferable to fabricate these composite SOC electrolytes over the powder-co-sintering route.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.71174","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148848940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of ZrO2 Doping on the Structure and Mechanical Properties of Y2O3-Modified Basalt Fibers ZrO2掺杂对y2o3改性玄武岩纤维结构和力学性能的影响

IF 4.2 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-08-26 DOI: 10.1111/jace.71154

Xin Liu, Xinjian Sun, Lei Xie, Xinjie Zhou, Qinghai Wang, Peiyi Wang, Shihuang Qiu

{"title":"Effects of ZrO2 Doping on the Structure and Mechanical Properties of Y2O3-Modified Basalt Fibers","authors":"Xin Liu, Xinjian Sun, Lei Xie, Xinjie Zhou, Qinghai Wang, Peiyi Wang, Shihuang Qiu","doi":"10.1111/jace.71154","DOIUrl":"https://doi.org/10.1111/jace.71154","url":null,"abstract":"<div>\u0000 \u0000 To address the difficulty in simultaneously optimizing glass-network densification and fiber-forming processability in continuous basalt fibers, this study combines melt preparation, fiber drawing, structural characterization, and computational simulations to investigate the effects of ZrO2 content on the microstructural evolution and macroscopic mechanical properties of Y2O3-modified basalt fibers. The results show that, at a ZrO2 content of 1 wt%, ZrO2 forms Si/Al-O-Zr linkages, enabling Zr-O polyhedra to participate in the construction of the glass network. Meanwhile, the proportion of bridging oxygen increases, whereas the relative contents of non-bridging oxygen and highly coordinated Al decrease, thereby promoting densification of the glass-network structure. Consequently, the elastic modulus and hardness reach 72.25 and 7.11 GPa, respectively, while the tensile strength of the individual fibers reaches 2.12 GPa. This study reveals the intrinsic mechanism by which ZrO2 regulates the structure of Y2O3-modified basalt glass and the properties of the resulting fibers, providing a new strategy for designing continuous basalt fibers that simultaneously achieve favorable fiber-forming processability and enhanced mechanical properties.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148848945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-Temperature Evolution of a Core–Shell TBC: Linking Microstructure to CMAS, Sintering, and Fracture Resistance 核壳TBC的高温演化：连接微观结构与CMAS，烧结和抗断裂性能

IF 4.2 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-08-25 DOI: 10.1111/jace.71181

Zichen Li, Junquan Lao, Gyaneshwara Brewster, Ping Xiao, Ying Chen

{"title":"High-Temperature Evolution of a Core–Shell TBC: Linking Microstructure to CMAS, Sintering, and Fracture Resistance","authors":"Zichen Li, Junquan Lao, Gyaneshwara Brewster, Ping Xiao, Ying Chen","doi":"10.1111/jace.71181","DOIUrl":"https://doi.org/10.1111/jace.71181","url":null,"abstract":"Calcia–magnesia–alumino–silicate (CMAS) attack severely limits the durability of thermal barrier coatings (TBCs). We recently introduced a novel core–shell TBC architecture exhibiting exceptional resistance to CMAS attack and fracture. Here, we elucidate the microstructural evolution of this coating during annealing at 1100°C–1300°C and establish its links with key TBC design requirements. The as-deposited splat shell exhibits a metastable microstructure consisting of alumina-containing t′-zirconia and intergranular amorphous alumina. In situ high-temperature TEM reveals rapid crystallization of the amorphous phase into α-alumina, accompanied by the precipitation of nanoscale α-alumina within supersaturated t′-zirconia. With prolonged exposure, the system progressively coarsens into a thermodynamically equilibrated zirconia-alumina composite. Despite these pronounced transformations, coating integrity and functional performance are preserved. Remarkably, CMAS resistance remains strong, with infiltration depths remaining more than six times lower than those of the YSZ TBC. This robustness arises because alumina crystallization, coarsening, and redistribution remain confined to the shell region, preserving the multiscale CMAS-mitigation mechanisms operating along splat interfaces and grain boundaries. The coating exhibits enhanced sintering resistance, as evidenced by its lower modulus, higher porosity, and a defect-healing activation energy twice that of the YSZ TBC. This behavior is attributed to intergranular alumina that restricts grain-boundary diffusion and motion. The coating also maintains high fracture resistance, showing toughness 6%–10% higher than the YSZ TBC after annealing at 1100°C–1200°C, which is attributed to increased crack tortuosity and retention of t′-zirconia. These findings further validate the core–shell design as a robust strategy for achieving durable, CMAS-resistant TBCs.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.71181","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultra-Low FMR Linewidth in Pr–NiZn Microwave Ferrites: Mechanism Insights With Machine Learning-Assisted Prediction Pr-NiZn微波铁氧体的超低FMR线宽：机器学习辅助预测的机制洞察

IF 4.2 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-08-24 DOI: 10.1111/jace.71168

Zongcheng Su, Yan Yang, Yu Xiong, Changjiang Chen, Yang Xiao, Junhui Li, Jiayin Zhang

{"title":"Ultra-Low FMR Linewidth in Pr–NiZn Microwave Ferrites: Mechanism Insights With Machine Learning-Assisted Prediction","authors":"Zongcheng Su, Yan Yang, Yu Xiong, Changjiang Chen, Yang Xiao, Junhui Li, Jiayin Zhang","doi":"10.1111/jace.71168","DOIUrl":"https://doi.org/10.1111/jace.71168","url":null,"abstract":"<div>\u0000 \u0000 Achieving low ferromagnetic resonance (FMR) linewidth together with excellent gyromagnetic properties in NiZn microwave ferrites remains a significant challenge. This difficulty arises from the strong coupling among rare-earth substitution, cation distribution, and microstructural evolution. In this work, Pr3+-substituted NiZn ferrites were systematically investigated by integrating experimental characterization, density functional theory (DFT), and machine learning. DFT results indicate that Pr3+ preferentially occupies octahedral B sites, leading to lattice expansion and modified local spin configurations. The FMR linewidth (ΔH) is governed by porosity-related (ΔHp) and anisotropy-related (ΔHa) contributions. The introduction of Pr3+ combined with Bi2O3-assisted liquid-phase sintering significantly improves densification and grain uniformity, thereby suppressing ΔHp. However, excessive Pr3+ enhances magnetocrystalline anisotropy and increases ΔHa. Based on this synergistic regulation, the optimized composition (x = 0.04) achieves Ms = 51.95 emu/g and ΔH = 119 Oe. An Optuna-based AutoML framework further demonstrates reliable predictive capability (MAE = 2.81, R2 = 0.85).\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2026-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Understanding the Roles of V2O5 and Nb2O5 in the Network Structure of Alkaline Earth Aluminoborosilicate Glasses V2O5和Nb2O5在碱土铝硼硅酸盐玻璃网络结构中的作用

IF 4.2 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-07-28 DOI: 10.1111/jace.71040

Anuraag Gaddam, George E. Stan, Shweta R. Keshri, Hugo R. Fernandes, Catalin C. Negrila, Glenn C. Mather, Maria J. Pascual, Julien Trébosc, François O. Méar, Lionel Montagne, José M. F. Ferreira, Amarnath R. Allu

{"title":"Understanding the Roles of V2O5 and Nb2O5 in the Network Structure of Alkaline Earth Aluminoborosilicate Glasses","authors":"Anuraag Gaddam, George E. Stan, Shweta R. Keshri, Hugo R. Fernandes, Catalin C. Negrila, Glenn C. Mather, Maria J. Pascual, Julien Trébosc, François O. Méar, Lionel Montagne, José M. F. Ferreira, Amarnath R. Allu","doi":"10.1111/jace.71040","DOIUrl":"https://doi.org/10.1111/jace.71040","url":null,"abstract":"<div>\u0000 \u0000 Owing to the possibility of attaining variable oxidation states and coordination numbers, the specific structural roles of V2O5 or Nb2O5 in determining the local configurations of framework species in alkaline earth aluminoborosilicate glasses still need to be disclosed. This manuscript describes the structural changes induced by adding 5 mol% of V2O5 or Nb2O5 to a complex aluminoborosilicate glass (mol%) 10MgO–15CaO–25SrO–5Al2O3–5B2O3–40SiO2, aiming at elucidating the connectivity of these transition metal cations in the glass network. The resulting structural changes have been assessed by magic angle spinning-nuclear magnetic resonance (MAS-NMR) (for 29Si, 27Al, 11B, 51V, and 93Nb nuclei), UV-visible spectroscopy, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared and Raman spectroscopy, differential thermal analysis (DTA), molecular dynamics (MD) simulations, and density functional theory (DFT) calculations. XPS analysis indicated the presence of V and Nb with a 5+ oxidation state. The NMR spectroscopy, MD simulations, and DFT calculations suggest that V exists in 4-, 5-, and 6-coordination, whereas Nb exists mostly in 6-coordination. Both V and Nb are well incorporated into the silicate network. The results do not suggest any clustering of either of the V- or Nb-based units.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 8","pages":""},"PeriodicalIF":4.2,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic Enhancement of Thermal Conductivity and Reduction of Thermal Expansion in Multi-Sized Al2O3/Epoxy Composites 多尺寸Al2O3/环氧复合材料导热系数的协同增强和热膨胀的降低

IF 4.2 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-07-28 DOI: 10.1111/jace.71050

Liang Guo, Shaoyu Wang, Yuzheng Zhang, Jianping Sun, Congliang Huang

{"title":"Synergistic Enhancement of Thermal Conductivity and Reduction of Thermal Expansion in Multi-Sized Al2O3/Epoxy Composites","authors":"Liang Guo, Shaoyu Wang, Yuzheng Zhang, Jianping Sun, Congliang Huang","doi":"10.1111/jace.71050","DOIUrl":"https://doi.org/10.1111/jace.71050","url":null,"abstract":"<div>\u0000 \u0000 The high-power density of electronic devices imposes urgent demands on packaging materials with high thermal conductivity and low thermal expansion. Epoxy resin (EP), a widely used packaging material, suffers from intrinsically low thermal conductivity and high coefficient of thermal expansion (CTE). In this work, Al2O3 nanoparticles were incorporated into EP to improve its performance, and a model was established to predict the CTE. For mono-sized particle composites, smaller particles could yield higher thermal conductivity due to denser filler networks. This phenomenon differs from the behavior observed in sparse nanoparticle fillings, in which smaller particles lead to lower thermal conductivity when the filling ratio is below the threshold for forming thermal conduction networks. The smaller the nanoparticles, the lower the CTE of the composites, due to the lower CTE of the nanoparticles. For mono-sized particle composites, the 10nm-Al2O3 composite achieves the highest thermal conductivity of 0.569 W·m−1·K−1 (2.42 times that of EP) and simultaneously the lowest CTE of 37.2 × 10−6/°C (48% lower than that of EP). Although smaller nanoparticles are suggested for improving the performance, they are prone to aggregation, thus jeopardizing their performance. To suppress nanoparticle aggregation at high filler loadings, multi-sized Al2O3/EP composites were applied. Small particles could fill the interstices between large particles, enabling the filler loading to reach 60 wt.% in this work. The multi-sized composite could achieve a thermal conductivity of 0.825 W·m−1·K−1 (3.5 times that of EP), and the CTE could be reduced to 39.7 × 10−6/°C (44% lower than that of EP). This work provides a strategy for designing high‑performance packaging composites.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 8","pages":""},"PeriodicalIF":4.2,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0