Ceramics International最新文献_第6页

Multifunctional properties of Cobalt Ferrite-Lanthanum Calcium Manganite nanocomposites for Hydroelectric Cell applications 钴铁酸盐-镧钙锰酸盐纳米复合材料在水电电池中的多功能性能

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.11.402

Chitralekha , S. Gaurav , Manoj Kumar Khanna , A.P. Singh , S. Shankar

The present work reports the multifunctional nanocomposites comprising of cobalt ferrite (CoFe₂O₄) and lanthanum calcium manganite (La_0.67Ca_0.33MnO₃) prepared via solid-state reaction route for hydroelectric cell applications. X-ray diffraction (XRD) studies and Fourier transform Infrared (FT-IR) spectroscopy confirmed the co-existence of spinel CoFe₂O₄ (CF) and perovskite La_0.67Ca_0.33MnO₃ (LCM) phase with crystallite size ranging between 25 nm and 41 nm. The surface morphological analysis and Brunauer-Emmet-Teller (BET) studies revealed mesoporous grains, high surface area and improved adsorption occurs in 0.4CF - 0.6LCM. The elimination of the hydroxyl group causes a noticeable weight loss, which confirms thermal disintegration in nanomaterials. Dielectric studies revealed Maxwell-Wagner polarization and increase in permittivity from 10⁴ to approx. 10⁵ with maximum temperature and concentration of LCM. Impedance spectroscopy revealed non-Debye type relaxation and temperature dependent grain boundary resistance. Magnetic measurements of CF-LCM nanocomposites showed soft ferromagnetic behavior with decreasing coercivity from 640.29 Oe (CF) to 403.59 Oe (0.6CF – 0.4LCM composite) as LCM content is increased. The hydroelectric cell fabricated from CF-LCM nanocomposites, the 0.4CF - 0.6LCM composite exhibited significant improvement in current of 2.3 mA under moist conditions for cell area 0.96 mm², nearly fivefold higher than that of CF. These results validate the potential of multifunctional properties of CF–LCM nanocomposites for sustainable energy applications.

本文报道了由钴铁氧体（CoFe2O4）和镧钙锰酸盐（La0.67Ca0.33MnO3）组成的多功能纳米复合材料的固相反应制备及其在水力电池中的应用。x射线衍射（XRD）和傅里叶变换红外光谱（FT-IR）研究证实尖晶石CoFe2O4 （CF）与钙钛矿La0.67Ca0.33MnO3 （LCM）相共存，晶粒尺寸在25 ~ 41 nm之间。表面形貌分析和Brunauer-Emmet-Teller （BET）研究表明，0.4CF - 0.6LCM中存在介孔颗粒、高表面积和更好的吸附。羟基的消除导致明显的重量损失，这证实了纳米材料的热分解。电介质研究显示麦克斯韦-瓦格纳极化和介电常数从104增加到大约。LCM的最高温度和浓度为105。阻抗谱显示非德拜型弛豫和温度相关的晶界电阻。磁性测量表明，随着LCM含量的增加，CF-LCM纳米复合材料的矫顽力从640.29 Oe （CF）降低到403.59 Oe （0.6CF - 0.4LCM复合材料），呈现出软铁磁性行为。利用CF- lcm纳米复合材料制备的水力发电电池，在电池面积为0.96 mm2的条件下，0.4CF - 0.6LCM纳米复合材料的电流显著提高，达到2.3 mA，是CF的近5倍。这些结果验证了CF- lcm纳米复合材料在可持续能源领域的多功能应用潜力。

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引用次数: 0

Bio-inspired materials for the hydrogen economy: A green synthesis route enhancing performance and sustainable development 氢经济的仿生材料：提高性能和可持续发展的绿色合成路线

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.11.403

Xiaozhen Lu , Yafeng Chen

Hydrogen-based energy systems require safe and high-capacity solid-state storage materials, motivating the exploration of defect-tunable ceramic spinels with fast proton–electron transport pathways. In this work, we report the bio-inspired synthesis of defect-engineered LiFeMnO₄ spinel nanoceramics using a tannin-assisted combustion route, enabling simultaneous control over oxygen vacancies and cation ordering. Comprehensive structural characterization by XRD/Rietveld refinement confirmed the formation of a single-phase cubic spinel (Fd-3m) with microstrain-induced peak broadening attributed to controlled defect incorporation. FESEM and HR-TEM analyses revealed sub-50 nm polyhedral grains with interconnected pore channels, while XPS verified the presence of mixed Fe²⁺/Fe³⁺ and Mn³⁺/Mn⁴⁺ redox couples favorable for proton-coupled charge transfer. Nitrogen sorption measurements indicated a mesoporous architecture with a specific surface area of 41.2 m² g⁻¹. Electrochemical testing using cyclic voltammetry, galvanostatic cycling, and impedance spectroscopy demonstrated that defect-engineered LiFeMnO₄ exhibits rapid hydrogen adsorption kinetics and reduced charge-transfer resistance relative to its stoichiometric counterpart. The optimized sample delivered a hydrogen storage capacity of 1285 mAh g⁻¹ in 3 M KOH, maintaining 92 % capacity retention after 100 cycles. The enhanced behavior is attributed to synergistic effects of oxygen-vacancy-driven proton diffusion, mixed-valence transition metal redox activity, and mesoporous ion-accessible channels. This study highlights the role of defect engineering and green synthesis routes in designing next-generation ceramic spinels for hydrogen storage and broader clean-energy applications.

氢基能源系统需要安全和高容量的固态存储材料，这促使人们探索具有快速质子-电子传输途径的缺陷可调陶瓷尖晶石。在这项工作中，我们报道了使用单宁辅助燃烧路线的生物启发合成缺陷工程LiFeMnO4尖晶石纳米陶瓷，可以同时控制氧空位和阳离子有序。通过XRD/Rietveld细化的综合结构表征证实，形成了一种具有微应变诱导峰展宽的单相立方尖晶石（Fd-3m）。FESEM和HR-TEM分析显示在50 nm以下的多面体晶粒具有相互连接的孔道，而XPS证实存在有利于质子耦合电荷转移的混合Fe2+/Fe3+和Mn3+/Mn4+氧化还原偶对。氮吸附测量表明其具有41.2 m2 g−1的介孔结构。使用循环伏安法、恒流循环和阻抗谱进行的电化学测试表明，缺陷工程的LiFeMnO4具有快速的氢吸附动力学，并且相对于其化学计量物具有更低的电荷转移电阻。优化后的样品在3 M KOH条件下的储氢容量为1285 mAh g−1，循环100次后储氢容量保持92%。这种增强的行为归因于氧空位驱动的质子扩散、混合价过渡金属氧化还原活性和介孔离子可及通道的协同效应。这项研究强调了缺陷工程和绿色合成路线在设计下一代陶瓷尖晶石用于储氢和更广泛的清洁能源应用中的作用。

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引用次数: 0

High temperature synthesis of ZrO2-ZnO-TiO2 composite materials and their photocatalytic performance in ceramic glazes ZrO2-ZnO-TiO2复合材料的高温合成及其在陶瓷釉中的光催化性能

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.089

Jiaming Lin , Weida Hu , Tong Yu , Shuaipeng Chen , Cirong Wang , Hong Wang , Qijian Li

In this study, ZrO₂-ZnO-TiO₂ composite materials were synthesized by sol-hydrothermal method at 1250 °C, and their photocatalytic degradation performance for methylene blue under 450 nm blue light irradiation was evaluated. Subsequently, the synthesized ZrO₂-ZnO-TiO₂ composite materials were mixed with ceramic glaze and fired at 1250 °C to obtain ZrO₂-ZnO-TiO₂-Glaze materials, and their photocatalytic degradation of methylene blue was also investigated. The ZrO₂-ZnO-TiO₂ materials and ZrO₂-ZnO-TiO₂-Glaze materials were characterized by XRD, UV–Vis, SEM, TEM, FT-IR and XPS. The results show that under the high-temperature firing condition of 1250 °C, when the molar ratio of n_Zr: n_Zn: n_Ti is 1:4:8, the ZrO₂-ZnO-TiO₂-Glaze material exhibits the highest photocatalytic efficiency for methylene blue. After being irradiated by 450 nm blue light for 7 h, the removal rate of methylene blue can reach 90.2 %.

本研究采用溶胶-水热法在1250℃下合成了ZrO2-ZnO-TiO2复合材料，并对其在450 nm蓝光照射下光催化降解亚甲基蓝的性能进行了评价。随后，将合成的ZrO2-ZnO-TiO2复合材料与陶瓷釉料混合，1250℃烧制得到ZrO2-ZnO-TiO2-釉料材料，并对其光催化降解亚甲基蓝进行了研究。采用XRD、UV-Vis、SEM、TEM、FT-IR和XPS对ZrO2-ZnO-TiO2材料和ZrO2-ZnO-TiO2釉料材料进行了表征。结果表明：在1250℃高温烧制条件下，当nZr: nZn: nTi的摩尔比为1:4:8时，zro2 - zno - tio2 -釉料对亚甲基蓝的光催化效率最高；450 nm蓝光照射7 h后，亚甲基蓝的去除率可达90.2%。

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引用次数: 0

Cu/Y codoped Co-Mn spinel coatings via composite electrodeposition: Microstructure, electrical conductivity, and high-temperature oxidation resistance 复合电沉积Cu/Y共掺杂Co-Mn尖晶石涂层：微观结构、电导率和高温抗氧化性

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.106

Shunli He, Weiqiang Wang, Xiayu Leng, Linyue Wang, Haonan Zhang, Jianli Song

Solid oxide fuel cells (SOFCs) are widely regarded as one of the most promising clean energy technologies due to their high energy conversion efficiency, fuel flexibility, and near-zero emissions. However, long-term operation at elevated temperatures often leads to the evaporation and migration of chromium species from ferritic stainless steel (FSS) interconnects, resulting in severe cathode degradation, commonly referred to as chromium poisoning. In this study, a Cu- and Y-codoped Co-Mn spinel coating (MCO-Cu-Y) was developed using a composite electrodeposition method, followed by thermal conversion at 800 °C in air. Under optimized process parameters, the coating was fabricated on SUS430 substrates by co-depositing CuO, Mn₃O₄, and Y₂O₃ nanoparticles into a cobalt-rich matrix. The as-prepared spinel coating exhibited a dense microstructure and strong interfacial adhesion, with a uniform elemental distribution, as confirmed by SEM and EDS. Long-term oxidation tests revealed that the MCO-Cu-Y coating effectively suppressed Cr diffusion and maintained structural integrity. After 500 h of oxidation at 800 °C, the area-specific resistance (ASR) stabilized at 17.58 mΩ·cm², representing a 78% reduction compared with the uncoated substrate. Cu/Y codoping synergistically enhanced the electrical conductivity and oxidation resistance of the spinel coating, thereby offering a cost-effective and scalable protective solution for SOFC interconnects.

固体氧化物燃料电池（SOFCs）由于其高能量转换效率、燃料灵活性和近零排放而被广泛认为是最有前途的清洁能源技术之一。然而，在高温下的长期操作往往会导致铁素体不锈钢（FSS）互连中铬的蒸发和迁移，导致严重的阴极降解，通常被称为铬中毒。在本研究中，采用复合电沉积方法制备了Cu和y共掺杂的Co-Mn尖晶石涂层（MCO-Cu-Y），然后在800°C的空气中进行热转化。在优化的工艺参数下，将纳米CuO、Mn3O4和Y2O3共沉积到富钴基体中，在SUS430基体上制备了涂层。SEM和EDS分析表明，制备的尖晶石涂层微观结构致密，界面附着力强，元素分布均匀。长期氧化试验表明，MCO-Cu-Y涂层有效地抑制了Cr的扩散，保持了结构的完整性。在800℃下氧化500 h后，面积比电阻（ASR）稳定在17.58 mΩ·cm2，与未涂层的衬底相比降低了78%。Cu/Y共掺杂协同提高了尖晶石涂层的导电性和抗氧化性，从而为SOFC互连提供了一种具有成本效益和可扩展的保护解决方案。

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引用次数: 0

Alumina-SiC composites for enhanced ballistic performance using Spark Plasma Sintering 火花等离子烧结增强铝- sic复合材料的弹道性能

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.122

Guillaume Rayrat , Yann Bald , Florence Moitrier , Paul Beillard , Anthony Bracq , Sébastien Lemonnier , Frédéric Bernard , Sylvain Marinel , Fabian Delorme

This study explores the influence of SiC reinforcement on the microstructure, mechanical properties and ballistic performance of Al₂O₃-SiC composites fabricated by Spark Plasma Sintering. Composites containing 1 to 30 vol% SiC were processed using optimized SPS cycles to ensure high densification and controlled microstructural development. The addition of SiC led to significant improvements in hardness, fracture toughness and Young's modulus with the best compromise observed at 25 vol% SiC, sintered at 1600 °C. At this composition, a 30 % reduction in residual depth of penetration versus 7.62 mm × 51 FMJ/PB/HC AP P80 (0.308 Win) threat was measured compared to pure alumina, confirming the effectiveness of SiC reinforcement in enhancing ballistic resistance. Although higher SiC contents (≥25 vol%) resulted in the formation of mullite and a slight decrease in fracture toughness, the 25 vol% SiC composite offers an optimal balance between mechanical performance and cost-efficiency. These results position Al₂O₃-SiC composites as promising materials for lightweight and affordable ballistic protection systems.

研究了SiC增强剂对火花等离子烧结制备的Al2O3-SiC复合材料显微组织、力学性能和弹道性能的影响。SiC含量为1 ~ 30 vol%的复合材料采用优化的SPS循环处理，以确保高密度化和控制微观结构的发展。SiC的加入显著提高了合金的硬度、断裂韧性和杨氏模量，在1600℃烧结时，SiC含量为25 vol%时达到最佳。在这种成分下，与纯氧化铝相比，在7.62 mm × 51 FMJ/PB/HC AP P80 （0.308 Win）威胁下，残余穿透深度减少了30%，证实了SiC增强在增强抗弹道性能方面的有效性。虽然较高的SiC含量（≥25 vol%）会导致莫来石的形成和断裂韧性的轻微下降，但25 vol%的SiC复合材料在力学性能和成本效益之间提供了最佳的平衡。这些结果将Al2O3-SiC复合材料定位为轻质和经济实惠的弹道防护系统的有前途的材料。

{"title":"Alumina-SiC composites for enhanced ballistic performance using Spark Plasma Sintering","authors":"Guillaume Rayrat , Yann Bald , Florence Moitrier , Paul Beillard , Anthony Bracq , Sébastien Lemonnier , Frédéric Bernard , Sylvain Marinel , Fabian Delorme","doi":"10.1016/j.ceramint.2025.12.122","DOIUrl":"10.1016/j.ceramint.2025.12.122","url":null,"abstract":"<div><div>This study explores the influence of SiC reinforcement on the microstructure, mechanical properties and ballistic performance of Al2O3-SiC composites fabricated by Spark Plasma Sintering. Composites containing 1 to 30 vol% SiC were processed using optimized SPS cycles to ensure high densification and controlled microstructural development. The addition of SiC led to significant improvements in hardness, fracture toughness and Young's modulus with the best compromise observed at 25 vol% SiC, sintered at 1600 °C. At this composition, a 30 % reduction in residual depth of penetration versus 7.62 mm × 51 FMJ/PB/HC AP P80 (0.308 Win) threat was measured compared to pure alumina, confirming the effectiveness of SiC reinforcement in enhancing ballistic resistance. Although higher SiC contents (≥25 vol%) resulted in the formation of mullite and a slight decrease in fracture toughness, the 25 vol% SiC composite offers an optimal balance between mechanical performance and cost-efficiency. These results position Al2O3-SiC composites as promising materials for lightweight and affordable ballistic protection systems.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 3","pages":"Pages 3310-3323"},"PeriodicalIF":5.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145996445","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

Preparation and properties of micro-arc oxidation ceramic coating with Al2O3 phase on cannon barrel steel surface 炮管钢表面Al2O3微弧氧化陶瓷涂层的制备及性能

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.140

Shanshan Ren , Shuangchen Sun , Shukai Sun , Shengcheng He , Hailin Lu , Jian Li

A micro-arc oxidation (MAO) process suitable for cannon barrel steel was investigated. The treated samples were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS), and the microstructure and elemental composition of the coating were analyzed. The electrochemical corrosion tests and friction and wear tests with pulverized coal for varying durations were also conducted. The results show that the surface roughness increases by 9900 % after MAO treatment, while the micropores and microcracks appear in the ceramic coating. However, under severe wear, the friction coefficient decreases by 30.8 % and the wear width also decreases by 33.3 %, the corrosion potential increases by 25.4 %, and the corrosion current and corrosion rate both decrease by an order of magnitude. These results demonstrate that MAO provides a solid technical foundation for the application of cannon barrel steel in roller coal mills.

研究了一种适用于火炮身管钢的微弧氧化工艺。采用扫描电子显微镜（SEM）、x射线衍射仪（XRD）和能谱仪（EDS）对处理后的样品进行了表征，并对涂层的微观结构和元素组成进行了分析。进行了不同时间煤粉的电化学腐蚀试验和摩擦磨损试验。结果表明：经MAO处理后，涂层表面粗糙度提高了9900%，涂层表面出现微孔和微裂纹；而在严重磨损条件下，摩擦系数减小30.8%，磨损宽度减小33.3%，腐蚀电位增大25.4%，腐蚀电流和腐蚀速率均减小一个数量级。这些结果表明，MAO为炮管钢在辊式煤机上的应用提供了坚实的技术基础。

引用次数: 0

Synthesis of Ultralow-coercivity Mn0.5Zn0.5Fe2O4 nanoparticles from steel pickling wastewater by utilizing a KMnO4-Mediated oxidation strategy for Fe2+/Fe3+ ratio control 利用kmno4氧化控制铁/铁比合成超低矫顽力Mn0.5Zn0.5Fe2O4纳米颗粒

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.156

Wenzhuo Hu , Liyi Zhou , Tianle Sun , Maoyuan Li , Jintian Sang , Meihua Zhou , Minghui Li , Zhimei Li

The hydrothermal method has become an ideal technology for preparing high-performance manganese-zinc ferrite due to its mild reaction conditions, excellent crystal control, and low environmental impact. However, the traditional hydrothermal method relies on pure chemical reagents, which are costly and do not fully utilize the pickling waste liquid rich in Fe²⁺ from steel. To address these issues, we propose a strategy for synthesizing high-performance Mn_0.5Zn_0.5Fe₂O₄ nanoparticles from pickling waste liquid. By using potassium permanganate (KMnO₄) as an oxidant, we can precisely control the Fe²⁺/Fe³⁺ molar ratio (19:81) while also providing Mn²⁺ ions, thereby reducing the demand for external manganese sources by 80 %. The application of KMnO₄ simplifies the synthesis process, reduces costs, and enhances product performance, achieving high-value utilization of waste liquid. Optimizing hydrothermal conditions (180 °C, pH 11) further enhances sustainability by reducing energy consumption and chemical waste, thereby significantly reducing the environmental impact. Characterization results show that the Mn_0.5Zn_0.5Fe₂O₄ synthesized under conditions of 180 °C and pH 11 exhibits a pure-phase spinel structure, with an average grain size of 8.7 nm, a uniform distribution of Mn²⁺/Zn²⁺ site occupancy, a low coercivity of 6.7 A/m, and a saturation magnetization of 48.7 emu/g, making it suitable for applications in high-frequency transformers, inductors, and electromagnetic interference suppression devices. This study presents a novel approach for producing low-loss soft magnetic materials by utilizing waste liquid resources, thereby contributing to the high-value utilization of steel pickling waste liquid and sustainable material preparation, with significant environmental and practical value.

水热法制备高性能锰锌铁氧体具有反应条件温和、晶体可控性好、环境影响小等优点，已成为制备高性能锰锌铁氧体的理想技术。然而，传统的水热法依赖于纯化学试剂，成本高，不能充分利用钢中富含Fe2+的酸洗废液。为了解决这些问题，我们提出了一种从酸洗废液中合成高性能Mn0.5Zn0.5Fe2O4纳米粒子的策略。通过使用高锰酸钾（KMnO4）作为氧化剂，我们可以精确地控制Fe2+/Fe3+的摩尔比（19:81），同时提供Mn2+离子，从而减少80%的外部锰源需求。KMnO4的应用简化了合成工艺，降低了成本，提高了产品性能，实现了废液的高价值利用。优化水热条件（180°C, pH 11），通过减少能源消耗和化学废物进一步提高可持续性，从而显著降低对环境的影响。表征结果表明，在180℃、pH为11条件下合成的Mn0.5Zn0.5Fe2O4具有纯相尖晶石结构，平均晶粒尺寸为8.7 nm， Mn2+/Zn2+位占用分布均匀，矫顽力低，为6.7 a /m，饱和磁化强度为48.7 emu/g，适合用于高频变压器、电感器和电磁干扰抑制器件。本研究提出了一种利用废液资源生产低损耗软磁材料的新方法，有助于酸洗废液的高价值利用和材料的可持续制备，具有重要的环境和实用价值。

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引用次数: 0

High-temperature study of the thermodynamic properties of calcium orthosilicate 正硅酸钙热力学性质的高温研究

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.162

Sergey Shornikov

The calcium orthosilicate (Ca₂SiO₄) is one of the most important components of silicate slags and cement clinkers. The Ca₂SiO₄ evaporation was studied by the Knudsen effusion mass spectrometry in the temperature range of 1762–2267 K. The vapor species typical of simple oxides and the CaSiO₃ gaseous oxide have been identified in the gas phase over calcium orthosilicate. The partial pressures of vapor species over Ca₂SiO₄ have been determined for the first time. The calculated oxide activities were used to determine the mixing energy in calcium orthosilicate, as well as the mixing enthalpy and entropy, equal to −34.90 ± 0.20 kJ/mol and 6.60 ± 0.10 J/(mol × K). The estimation of the mixing enthalpy and entropy of the rankinite (Ca₃Si₂O₇) based on the obtained thermodynamic data corresponds to the available values at 1600–1737 K.

正硅酸钙（Ca2SiO4）是硅酸盐渣和水泥熟料的重要成分之一。采用Knudsen液质谱法研究了Ca2SiO4在1762 ~ 2267 K温度范围内的蒸发过程。在正硅酸钙的气相中发现了典型的简单氧化物和CaSiO3气态氧化物。首次测定了Ca2SiO4表面的蒸汽分压。计算出的氧化物活度可用于确定正硅酸钙的混合能，以及混合焓和熵，分别为- 34.90±0.20 kJ/mol和6.60±0.10 J/（mol × K）。在1600 ~ 1737 K范围内，根据所得的热力学数据估算出了钙钛矿（Ca3Si2O7）的混合焓和熵。

引用次数: 0

Multifunctional properties of (Y0.25Ni0.75FeO3)0.5(BaTiO3)0.5: A solid-state route to enhanced dielectric, magnetic, and optoelectronic performance （Y0.25Ni0.75FeO3）0.5(BaTiO3)0.5的多功能特性：提高介电、磁性和光电性能的固态途径

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.167

Harshavardhan Chouhan , Saurabh Prasad , Mahanta Chouhan , Bapan Gowala , B.N. Parida , Rajanikanta Parida

In this study, a novel Ni-rich composite perovskite (Y_0.25Ni_0.75FeO₃)_0.5(BaTiO₃)_0.5 was synthesized via a conventional high-temperature solid-state route and systematically characterized to explore its structural, optical, dielectric, electrical and magnetic properties. Motivated by the promising multifunctionality observed in Ni-doped orthoferrites, this composition was strategically designed to enhance magnetoelectric coupling and thermal sensitivity through increased Ni substitution. X-ray diffraction and Rietveld refinement confirmed a multiphase structure predominantly comprising a cubic perovskite phase with minor orthorhombic and secondary cubic contributions. Microstructural analysis revealed a nanoscale grain morphology with homogeneous elemental dispersion, while FTIR spectra indicated the successful formation of characteristic vibrational modes associated with metal-oxygen bonds. UV–Visible spectroscopy demonstrated strong visible-light absorption with a direct band gap of ∼1.58 eV, signifying potential for optoelectronic applications. Dielectric measurements showed a high permittivity (∼1656 at 25 °C) and pronounced temperature and frequency dependence, aligning with Maxwell-Wagner interfacial polarization. Impedance spectroscopy revealed NTCR behaviour and non-Debye type relaxations having distinct activation energies in low and high-temperature domains. The composite also exhibited substantial leakage current and stable electrical resistivity at elevated temperatures, confirming its semiconducting nature. Furthermore, magnetic hysteresis at room temperature confirmed enhanced ferromagnetic ordering with saturation magnetization reaching 5.52 emu/g. Collectively, the results demonstrate that A-site engineering via Ni enrichment effectively tunes the multifunctional characteristics of the (YFeO₃) -(BaTiO₃) system, making this composite a promising candidate for thermistor, energy storage, and multifunctional device applications.

本研究采用传统高温固相法合成了一种新型富镍复合钙钛矿（Y0.25Ni0.75FeO3）0.5(BaTiO3)0.5，并对其结构、光学、介电、电学和磁性能进行了系统表征。由于在Ni掺杂的正铁氧体中观察到的有前途的多功能性，该组合物被战略性地设计为通过增加Ni取代来增强磁电耦合和热敏性。x射线衍射和Rietveld细化证实了多相结构，主要由立方钙钛矿相组成，有少量正交和次立方贡献。微观结构分析表明，纳米级晶粒形貌具有均匀的元素色散，而FTIR光谱表明成功形成了与金属-氧键相关的特征振动模式。紫外可见光谱显示出强烈的可见光吸收，直接带隙为~ 1.58 eV，表明光电子应用的潜力。介电测量显示高介电常数（25°C时约1656）和明显的温度和频率依赖性，与麦克斯韦-瓦格纳界面极化一致。阻抗谱显示了NTCR行为和非debye型弛豫，在低域和高温域具有不同的活化能。该复合材料在高温下还表现出可观的漏电流和稳定的电阻率，证实了其半导体性质。当饱和磁化强度达到5.52 emu/g时，室温磁滞现象证实铁磁有序增强。总的来说，结果表明，通过Ni富集的a位工程有效地调节了(YFeO3) -(BaTiO3)体系的多功能特性，使该复合材料成为热敏电阻，储能和多功能器件应用的有希望的候选者。

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引用次数: 0

Scintillation properties of Er2O3-doped La2O3–TiO2–TeO2 glass and glass ceramics er2o3掺杂La2O3-TiO2-TeO2玻璃及玻璃陶瓷的闪烁特性

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.133

Naoki Kawano , Luiz G. Jacobsohn , Daisuke Nakauchi , Takumi Kato , Kai Okazaki , Kensei Ichiba , Toshiaki Kunikata , Akihiro Nishikawa , Keiichiro Miyazaki , Fumito Kagaya , Kenji Shinozaki , Takayuki Yanagida

0.5Er₂O₃–10La₂O₃–10TiO₂–79.5TeO₂ (ErLTT) glass and glass ceramics were prepared envisioning near-infrared (NIR) scintillators. The glass ceramics were synthesized by thermal processing of the ErLTT glass at 480 °C (ErLTT480) or 490 °C (ErLTT490) for 24 h. Several photoluminescence and scintillation peaks were ascribed to the 4f→4f transitions of Er³⁺. The photoluminescence quantum yield was improved by thermal processing of the glass and the formation of the crystalline phase, with the highest quantum yield being observed from ErLTT490. Scintillation enhancement was discussed in terms of the charge carrier transport and the quantum yield of the luminescence center. Moreover, ErLTT490 showed the most intense scintillation intensity, and its lowest measurable dose rate recorded with a lnGaAs photodiode was about 10 mGy/h, similar to that of an Er³⁺-doped Bi₄Ge₃O₁₂ single crystal.

利用近红外（NIR）闪烁体制备了0.5Er2O3-10La2O3-10TiO2-79.5TeO2 （ErLTT）玻璃和玻璃陶瓷。ErLTT玻璃在480°C （ErLTT480）或490°C （erlttt490）下热处理24 h，合成了玻璃陶瓷。Er3+的4f→4f跃迁引起了几个光致发光和闪烁峰。通过对玻璃进行热处理和形成晶相，提高了光致发光量子产率，其中ErLTT490的量子产率最高。从载流子输运和发光中心的量子产率两个方面讨论了闪烁增强。此外，erlt490的闪烁强度最强，lnGaAs光电二极管记录的最低可测剂量率约为10 mGy/h，与Er3+掺杂Bi4Ge3O12单晶的剂量率相似。

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引用次数: 0