Journal of The European Ceramic Society最新文献_第3页

Reactive and non-reactive hot pressing of ZrB2-SiC-C UHTCs: Structure, mechanical and thermal properties ZrB2-SiC-C超高温碳化物的反应和非反应热压：结构、力学和热性能

IF 6.2 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-09-20 DOI: 10.1016/j.jeurceramsoc.2025.117839

Oleksii Popov , Volodymyr Dibrov , Vasyl Kuryliuk , Vladimir Vishnyakov

{"title":"Reactive and non-reactive hot pressing of ZrB2-SiC-C UHTCs: Structure, mechanical and thermal properties","authors":"Oleksii Popov , Volodymyr Dibrov , Vasyl Kuryliuk , Vladimir Vishnyakov","doi":"10.1016/j.jeurceramsoc.2025.117839","DOIUrl":"10.1016/j.jeurceramsoc.2025.117839","url":null,"abstract":"<div><div>Four different precursor powder mixtures of ZrC-B4C-Si, ZrC-B4C-ZrSi2, ZrC-B-ZrSi2, and ZrB2-SiC-C were hot-pressed at 1850 °C and 30 MPa for 3 min to produce ZrB2-SiC-C heteromodulus Ultra-High Temperature Ceramics (UHTCs). Pure silicon, as one of the precursors, was shown to cause macroscopic reaction-induced stratification in the sintered sample, with the inner part enriched in oxygen impurities and carbon. Introducing silicon through ZrSi2 did not lead to notable stratification. The materials' hardness decreased from 20 to 8 GPa, while the toughness rose from 4.2 to 5.4 MPa·m1/2 with graphite content. The thermal conductivity of the reactively sintered samples increased from 38 to 73 W/mK with the increase in ZrB2 content. The conventionally hot-pressed materials exhibited an opposite trend in the thermal conductivity coefficient. The different behaviours were explained based on the composite structure and the interface contact thermal resistance. The thermal shock tolerance improved significantly with the increase in graphite content.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117839"},"PeriodicalIF":6.2,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Synthesis of HfBCN single-source precursor and its spinning feasibility for deriving ultra-high temperature ceramic fibers HfBCN单源前驱体的合成及其纺丝制备超高温陶瓷纤维的可行性

IF 6.2 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-09-20 DOI: 10.1016/j.jeurceramsoc.2025.117842

Wenshuo Hu, Cheng Han, Zhe Zhao, Yu Yang, Xiaozhou Wang

{"title":"Synthesis of HfBCN single-source precursor and its spinning feasibility for deriving ultra-high temperature ceramic fibers","authors":"Wenshuo Hu, Cheng Han, Zhe Zhao, Yu Yang, Xiaozhou Wang","doi":"10.1016/j.jeurceramsoc.2025.117842","DOIUrl":"10.1016/j.jeurceramsoc.2025.117842","url":null,"abstract":"<div><div>Hafnium (Hf)-containing polymers have garnered increasing attention as single-source precursors for ultrahigh-temperature ceramics (UHTCs), but it still remains significant challenges in regulating the highly active Hf atoms. Herein, we designed and synthesised a novel polymeric Hf-B-C-N precursor (PHBCN) by the dehalogenative substitution reactions using B(NHCH3)3, ClCH2CN, and HfCl4 as raw materials. A molecular collaborative strategy was described through the coordination effects of amidinate ligands and the conjugation effects of BN3 aromatic systems to modulate the electronic environment of Hf centers and promote the water/oxygen resistance of PHBCN. The pyrolysis of PHBCN at 1600 °C produced HfC/HfB2 nanocomposite ceramics with Hf content of 75.71 wt% and the phase evolution of polymer-derived ceramics was systematically investigated. Moreover, the hydrolytic-oxidative stability and proper rheological properties endowed PHBCN precursor with good spinnability, which would provide a new idea for advancing Hf-based UHTC fibers.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117842"},"PeriodicalIF":6.2,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Development of photocatalytic active SiCN-Ti e-spun fibers based on a polysilazane-derived precursor for hydrogen generation by photoreforming 基于聚硅氮烷衍生前驱体的光催化活性SiCN-Ti纤维的光重整制氢研究

IF 6.2 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-09-20 DOI: 10.1016/j.jeurceramsoc.2025.117840

Bernardo Araldi da Silva , Eranezhuth Wasan Awin , Sergio Yesid Gómez González , Luiz Fernando Belchior Ribeiro , Regina de Fátima Peralta Muniz Moreira , Agenor De Noni Junior , Günter Motz

{"title":"Development of photocatalytic active SiCN-Ti e-spun fibers based on a polysilazane-derived precursor for hydrogen generation by photoreforming","authors":"Bernardo Araldi da Silva , Eranezhuth Wasan Awin , Sergio Yesid Gómez González , Luiz Fernando Belchior Ribeiro , Regina de Fátima Peralta Muniz Moreira , Agenor De Noni Junior , Günter Motz","doi":"10.1016/j.jeurceramsoc.2025.117840","DOIUrl":"10.1016/j.jeurceramsoc.2025.117840","url":null,"abstract":"<div><div>This study focuses on synthesizing novel photocatalytic active Ti-doped SiCN fibers using a TiO2 precursor (titanium n-butoxide) and a commercially available silazane (Durazane 1800). The Ti-doped SiCN fibers were processed by combining the polymer-derived ceramic route and the electrospinning technique, which consists of controlling the polymerization of the precursors, electrospinning of the solutions, followed by thermal crosslinking and pyrolysis in a controlled atmosphere. Spectroscopic assessments revealed that the TiO2 precursor reacts with N-H and Si-H groups from the polysilazane during cross-linking. In addition, thermogravimetric analysis (TGA) essays showed that adding TiO2 increased ceramic yield upon pyrolysis. Free carbon (Cfree) and TiO2 enhanced the target photoactivated processes by increasing the fiber's light absorption range. The composites displayed a bandgap within the visible-light region and exhibited a 4-fold increment in hydrogen (H2) generation through photoreforming. The composites developed herein are promising candidates for visible-light-driven hydrogen generation systems.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117840"},"PeriodicalIF":6.2,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Improved lifetime reliability of MLCC against water vapor by forming an interfacial alloy between internal and external electrodes 通过在内外电极之间形成界面合金，提高了MLCC抗水蒸气的寿命可靠性

IF 6.2 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-09-19 DOI: 10.1016/j.jeurceramsoc.2025.117832

Kyung Joo Lee , Jae Won Lee , Nhat Nam Hoang , Yunjung Park , Byung Sung Kang , Wook Jo , Honggi Kim , Yong-Gyu Han , Min-Hoe Kim , Mingon Lee , Jinsung Chun

{"title":"Improved lifetime reliability of MLCC against water vapor by forming an interfacial alloy between internal and external electrodes","authors":"Kyung Joo Lee , Jae Won Lee , Nhat Nam Hoang , Yunjung Park , Byung Sung Kang , Wook Jo , Honggi Kim , Yong-Gyu Han , Min-Hoe Kim , Mingon Lee , Jinsung Chun","doi":"10.1016/j.jeurceramsoc.2025.117832","DOIUrl":"10.1016/j.jeurceramsoc.2025.117832","url":null,"abstract":"<div><div>Voltage, temperature, and humidity are typical stressors used in high accelerated life testing (HALT) of multilayer ceramic capacitors (MLCCs). Especially in the case of humidity, there is no initial insulation resistance (IR) change and no IR degradation during HALT, indicating that the failure mechanism causing lifetime acceleration for humidity is different from voltage and temperature. This study confirms that there is no IR degradation during HALT against humidity, as protons generated by electrolysis of infiltrating water vapor at the anode electrode cause IR degradation through proton migration in a very short time. In addition, the water vapor-induced failures were caused in the region between the internal and external electrodes. Sintering in a low reducing atmosphere can inhibit these failures by forming an alloy between electrodes to maintain the film shape. Furthermore, the stretched exponential fitting method accurately accelerates specific water vapor-related failure modes when all MLCC lifetime modes coexist.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117832"},"PeriodicalIF":6.2,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Influence of SiC morphology and distribution on the ablation behavior of Ta0.8Hf0.2C-SiC coating for C/C composites SiC形貌及分布对Ta0.8Hf0.2C-SiC涂层烧蚀行为的影响

IF 6.2 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-09-18 DOI: 10.1016/j.jeurceramsoc.2025.117834

Shaopu Liu , Yaxin Wang , Ping Gu , Zhuang Ma , Yanbo Liu , Xinchun Tian , Shizhen Zhu , Ling Liu

{"title":"Influence of SiC morphology and distribution on the ablation behavior of Ta0.8Hf0.2C-SiC coating for C/C composites","authors":"Shaopu Liu , Yaxin Wang , Ping Gu , Zhuang Ma , Yanbo Liu , Xinchun Tian , Shizhen Zhu , Ling Liu","doi":"10.1016/j.jeurceramsoc.2025.117834","DOIUrl":"10.1016/j.jeurceramsoc.2025.117834","url":null,"abstract":"<div><div>To enhance the ablation resistance of carbon/carbon (C/C) composites under extreme thermal environments, Ta0.8Hf0.2C-SiC coatings were fabricated via pack cementation, with the morphology and distribution of SiC precisely tuned by adjusting the fabrication temperature. The influence of SiC characteristics on coating microstructure, oxide evolution, and ablation behavior was systematically investigated. Coatings with optimally sized (∼30–40 μm), well-dispersed SiC exhibited the highest spectral emissivity (2.5–3 μm), enabling efficient thermal radiation and surface temperature reduction. During oxyacetylene ablation at 2130 ℃ for 300 s, the optimized coating formed a dense, low-volatility Ta-Hf-Si-O oxide layer and achieved a near-zero linear ablation rate (0.103 μm/s). In contrast, coatings with underdeveloped or overgrown SiC led to porous structures, phase segregation, and inferior thermal protection. This study demonstrates the key role of SiC morphology in controlling oxide phase evolution and provides a promising strategy for the design of advanced carbide-based coatings for ultra-high-temperature aerospace applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117834"},"PeriodicalIF":6.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 Td and large d33 achieved in Bi0.5Na0.5TiO3-based ceramics designed by a novel 2–2-like hamburger structure 在bi0.5 na0.5 tio3基陶瓷中，采用一种新型的2- 2类汉堡包结构，实现了高Td和大d33

IF 6.2 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-09-18 DOI: 10.1016/j.jeurceramsoc.2025.117836

Dongyan Yu , Yong Zhang , Junqi Chen , Chengfu Xu , Jinwu Chen , Changrong Zhou , Laijun Liu

{"title":"High Td and large d33 achieved in Bi0.5Na0.5TiO3-based ceramics designed by a novel 2–2-like hamburger structure","authors":"Dongyan Yu , Yong Zhang , Junqi Chen , Chengfu Xu , Jinwu Chen , Changrong Zhou , Laijun Liu","doi":"10.1016/j.jeurceramsoc.2025.117836","DOIUrl":"10.1016/j.jeurceramsoc.2025.117836","url":null,"abstract":"<div><div>There is an inherent trade-off between high piezoelectricity originated from structural instability and enhanced thermal stability derived from structural stability in Bi0.5Na0.5TiO3 (BNT)-based piezoelectric ceramics. As a result, it is a signiﬁcant challenge for simultaneously achieving both large piezoelectric coefﬁcient (d33) and high depolarization temperature (Td). Herein, by designing the 2–2 hamburger-structured composites with different Ba2 + concentration, a harmonious balance between depolarization temperature Td (493 K) and piezoelectric coefﬁcient d33 (124 pC/N) is obtained in BNT-based ceramic composites. The large d33 primarily originates from the coexistence of rhombohedral and tetragonal phases. The high Td primarily benefits from the diffused ferroelectric-relaxor phase transition induced by the V-shaped Ba2+ diffusion gradient, localized electric field related to pores and residual stress. Consequently, our proposed strategy provides a novel perspective to boost both Td and d33 in BNT-based piezoceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 3","pages":"Article 117836"},"PeriodicalIF":6.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Excellent energy storage performance of Bi0.5Na0.5TiO3-based lead-free relaxor ferroelectrics via isovalent high-entropy doping 通过等价高熵掺杂制备的bi0.5 na0.5 tio3基无铅弛豫铁电体具有优异的储能性能

IF 6.2 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-09-18 DOI: 10.1016/j.jeurceramsoc.2025.117837

Jielin Zha , Yulong Yang , Xiaomei Lu , Xueli Hu , Zijing Wu , Min Zhou , Fengzhen Huang , Xuenong Ying , Jinsong Zhu

{"title":"Excellent energy storage performance of Bi0.5Na0.5TiO3-based lead-free relaxor ferroelectrics via isovalent high-entropy doping","authors":"Jielin Zha , Yulong Yang , Xiaomei Lu , Xueli Hu , Zijing Wu , Min Zhou , Fengzhen Huang , Xuenong Ying , Jinsong Zhu","doi":"10.1016/j.jeurceramsoc.2025.117837","DOIUrl":"10.1016/j.jeurceramsoc.2025.117837","url":null,"abstract":"<div><div>High-entropy strategy is acknowledged effective to improve energy storage performance of dielectric materials, yet the underlying mechanisms require further exploration. In this work, based on ferroelectric Bi0.5Na0.5TiO3 (BNT), we developed a series of (Bi0.25La0.25Na0.25K0.25)Ti1-xZrxO3 (BLNKTZ, x = 0.0, 0.05, 0.10) ceramics with varying configuration entropy (ΔSconfig), by introducing La/K and Zr with the same valence of Bi/Na and Ti, respectively. The high-entropy ceramic with x = 0.05 (ΔSconfig = 1.58 R) demonstrated excellent energy storage performance, achieving a recoverable energy density (Wrec) of 6.6 J/cm3 and efficiency (η) of 84 %. Additionally, the sample exhibited excellent temperature/frequency stability, fatigue resistance, high power density, high discharge density, and ultrafast charge-discharge speed. The proposed isovalent high-entropy doping strategy not only retains common advantages of high-entropy, i.e., multiphase polar nanoregions (PNRs) and ultrafine grains, but also improves lattice integrity and reduces oxygen vacancy concentration, thereby achieving high breakdown strength (Eb) and superior energy storage performance.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117837"},"PeriodicalIF":6.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Thermal erosion characteristics of vacuum hot-pressed NbC-modified ZrC ultra-high temperature ceramics ranging from 1500 to 2500 °C 1500 ~ 2500℃真空热压nbc改性ZrC超高温陶瓷的热侵蚀特性

IF 6.2 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-09-18 DOI: 10.1016/j.jeurceramsoc.2025.117835

Ruixiang He, Kezhi Li, Mengyuan Chang

{"title":"Thermal erosion characteristics of vacuum hot-pressed NbC-modified ZrC ultra-high temperature ceramics ranging from 1500 to 2500 °C","authors":"Ruixiang He, Kezhi Li, Mengyuan Chang","doi":"10.1016/j.jeurceramsoc.2025.117835","DOIUrl":"10.1016/j.jeurceramsoc.2025.117835","url":null,"abstract":"<div><div>Static oxidation and oxyacetylene ablation tests were conducted on vacuum hot-pressed NbC-modified ZrC (Zr1-xNbxC) ultra-high temperature ceramics. For revealing the oxidation mechanism, the phase composition of heat-treated ZrO2<img>Nb2O5 ceramics in Ar was identified. The results demonstrated that the stable phases of the ZrO2-50 mol% NbO2.5 ceramic heat-treated at 1700<img>1900 °C were Nb2Zr6O17 and NbO2. The oxidation resistant temperature limit (Tl) for Zr1-xNbxC was 1650 ˂ Tl ˂ 1700 °C. At 1650 °C for 30 h, Zr0.7Nb0.3C formed a dense oxide film comprising bulky ZrO2 bonded by lathy Nb2Zr6O17, exhibiting optimal oxidation resistance. Zr0.9Nb0.1C developed a dense “free-standing” single-phase ZrO2 film at 4.2 MW/m2 for 40 s × 6, achieving a modification effect on the ablation morphology of ZrC nearing 100%. Furthermore, the thermostability mechanism of ZrO2 to Nb2O5 and the formation mechanism of the “free-standing” structure were analysed.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117835"},"PeriodicalIF":6.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Tailoring the absorption peaks for enhanced in-line transmittance of Y2O3–MgO composites 调整吸收峰以增强Y2O3-MgO复合材料的在线透射率

IF 6.2 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-09-17 DOI: 10.1016/j.jeurceramsoc.2025.117833

Xincheng Cai , Junjing Duan , Zhangyi Huang , Lexing Liang , Zhenyu Zhang , Mao Deng , Jianqi Qi , Tiecheng Lu

{"title":"Tailoring the absorption peaks for enhanced in-line transmittance of Y2O3–MgO composites","authors":"Xincheng Cai , Junjing Duan , Zhangyi Huang , Lexing Liang , Zhenyu Zhang , Mao Deng , Jianqi Qi , Tiecheng Lu","doi":"10.1016/j.jeurceramsoc.2025.117833","DOIUrl":"10.1016/j.jeurceramsoc.2025.117833","url":null,"abstract":"<div><div>Y2O3<img>MgO composites have emerged as promising mid-infrared (MIR) materials owing to their exceptional broadband transmittance and remarkable thermal stability at elevated temperatures. Nevertheless, the presence of uncontrollable absorption bands within the 4–7 μm spectral range, compromises their optical performance in advanced MIR systems. To address this limitation, we systematically investigated annealing as a strategic approach for modulating defect chemistry in oxide composites. In this paper, the absorption peaks of Y2O3<img>MgO composites were controlled by varying the annealing conditions. As the annealing temperature increases from 600 °C to 1100 °C, the absorption peaks of Y2O3<img>MgO composites gradually shift from ∼4.9 μm to ∼6.8 μm, with a transition temperature ∼900°C. This behavior is attributed to the oxidation of metal-organic coordination (MOC) to CO32- in high-temperature air. Ultimately, Y2O3<img>MgO composites featuring controllable absorption peaks were obtained, demonstrating a transmittance of ∼81 % at 7 μm - the highest value ever reported for this composite system, which broadens the potential application space, particularly in fields requiring mid-infrared transparency such as gas detection, materials characterization, and biomedical imaging. This study not only elucidates specific strategies for enhancing the performance and microstructure of Y2O3<img>MgO composites but also furnishes reliable methodologies and datasets to support the annealing processes of other material systems.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117833"},"PeriodicalIF":6.2,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Ge doping collaboratively optimizes the thermoelectric properties and stability of liquid Cu2Se Ge掺杂协同优化了液态Cu2Se的热电性能和稳定性

IF 6.2 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-09-17 DOI: 10.1016/j.jeurceramsoc.2025.117820

Xueke Gu , Guangmeng You , Xinxin Wang , Yajing Wang , Yuli Yan , Gui Yang , Chengxiao Peng , Chao Wang

{"title":"Ge doping collaboratively optimizes the thermoelectric properties and stability of liquid Cu2Se","authors":"Xueke Gu , Guangmeng You , Xinxin Wang , Yajing Wang , Yuli Yan , Gui Yang , Chengxiao Peng , Chao Wang","doi":"10.1016/j.jeurceramsoc.2025.117820","DOIUrl":"10.1016/j.jeurceramsoc.2025.117820","url":null,"abstract":"<div><div>Liquid Cu<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math>Se thermoelectric materials hold significant potential due to their intrinsically low thermal conductivity. In this study, a series of Ge-doped Cu<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math>Se samples were synthesized using mechanical alloying and spark plasma sintering techniques. The investigation focused on examining the effects of Ge doping on the thermoelectric performance and stability of Cu<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math>Se. The introduction of Ge reduces Cu vacancies and promotes the formation of Cu<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math>Se/Ge heterojunctions within the matrix. These heterojunctions act as filters for low-energy carriers, thereby optimizing carrier concentration. They also increase dislocation density, enhance phonon scattering, and reduce thermal conductivity. Furthermore, the Cu<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math>Se/Ge interface forms a Schottky barrier, preventing the long-range migration of Cu<math><msup><mrow></mrow><mrow><mo>+</mo></mrow></msup></math> ions, which enhances the material’s stability. As a result, the ZT value reached 2.44 at 823 K, representing a 114% improvement. Furthermore, the nano-secondary phase and grain refinement have increased the compressive strength by four times, providing crucial support for equipment engineering.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117820"},"PeriodicalIF":6.2,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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