Nadejda Horchidan , Vlad Alexandru Lukacs , Mihai Asandulesa , George Stoian , Cristina Elena Ciomaga , Liliana Mitoseriu
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引用次数: 0
摘要
本研究调查了通过固态反应生产的不同成分（x = 0.010、0.018、0.100）的 BaGexTi1-xO3 陶瓷，探讨了成分和烧结温度（1150 °C、1200 °C、1300 °C）对功能特性（低场介电、可调性、铁电开关）的影响。增加 Ge 的用量和烧结温度可提高 BaGexTi1-xO3 的烧结性，使其几乎完全致密化。室温介电常数在 1000 到 2000 之间，介电损耗低于 10%。在添加少量 Ge 的情况下，介电行为和相变反映了 BaTiO3 陶瓷。增加 Ge 添加量会导致居里温度略有上升。介电弛豫机制涉及与氧空位和离子传导有关的两个活化能范围。晶粒尺寸较大的陶瓷表现出定义明确的铁电 P(E) 环，而晶粒较细的陶瓷则包含外在贡献。在 1150 °C 下烧结的 Ge 添加量最低的陶瓷具有最高的可调谐性能，能够承受最高直流电场的应用。
Exploring grain size and composition effects on the functional properties of BaGexTi1-xO3 ceramics
This study investigates BaGexTi1-xO3 ceramics with varying compositions (x = 0.010, 0.018, 0.100) produced by solid-state reaction, exploring the impact of composition and sintering temperatures (1150 °C, 1200 °C, 1300 °C) on functional characteristics (low-field dielectric, tunability, ferroelectric switching). Increasing Ge amount and sintering temperatures enhances sinterability of BaGexTi1-xO3 to almost complete densification. Room temperature permittivity ranges from 1000 to 2000, with dielectric losses below 10%. For small Ge additions, the dielectric behavior and phase transitions mirror BaTiO3 ceramics. Increasing Ge addition results in a slight increase of the Curie temperature. Dielectric relaxation mechanisms involve two activation energy ranges related to oxygen vacancies and ionic conduction. Ceramics with larger grain sizes exhibit well-defined ferroelectric P(E) loops, while fine-grained ones contain extrinsic contributions. The highest tunability performances are found for the lowest Ge additions, sintered at 1150 °C, which are able to withstand the application of the highest dc field.
期刊介绍：
The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.
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