Structural and electrical aspects of microwave sintered (Ba1-xCaxSn0.09 Ti0.91) O3 ceramics

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2023-06-19 DOI:10.1007/s10832-023-00319-9

Vaishnavi Khade, Madhuri Wuppulluri

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Abstract

Barium titanate ceramics with A- site and B-site substitutions are intriguing alternative to lead-based Pb (Zr, Ti) O₃ (PZT) because of its comparable properties to soft-PZTs. In this paper, (Ba_xCa_1-xSn_0.09 Ti_0.91) O₃ (x = 0.0525, 0.0575, 0.060) ceramics are prepared using a solid-state reaction technique followed by microwave sintering at 1350 °C for 30 minutes. Structural and electrical properties are investigated. X -ray diffraction shows that the compositions exhibit a tetragonal crystal structure having P4mm symmetry. Temperature dependent dielectric constant measurements in the temperature range of 25 °C to 120 °C shows high dielectric constant of 26250 at 40kHz for BCST ceramics with x=0.0525 and the Curie temperature T_c increases with Ca concentration. The results of dielectric measurements as a function of frequency are also reported. The dielectric loss (tan δ) values in the temperature range 25 °C to 120 °C are observed to be less than 0.03, for all BCST ceramics. The AC conductivity, impedance spectroscopy studies and the conduction mechanism on the basis of Arrhenius plot are discussed in the above-mentioned temperature range.

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微波烧结(Ba1-xCaxSn0.09 Ti0.91) O3陶瓷的结构和电学特性

具有 A 位和 B 位取代的钛酸钡陶瓷是铅基 Pb (Zr, Ti) O3 (PZT) 的有趣替代品，因为它具有与软 PZT 相似的特性。本文采用固态反应技术制备了（BaxCa1-xSn0.09 Ti0.91）O3（x = 0.0525、0.0575、0.060）陶瓷，然后在 1350 °C 下进行 30 分钟的微波烧结。对其结构和电气性能进行了研究。X 射线衍射显示，这些成分呈现出具有 P4mm 对称性的四方晶体结构。在 25 ℃ 至 120 ℃ 的温度范围内进行的随温度变化的介电常数测量显示，x=0.0525 的 BCST 陶瓷在 40kHz 时的介电常数高达 26250，居里温度 Tc 随 Ca 浓度的增加而增加。此外，还报告了介电测量结果与频率的函数关系。所有 BCST 陶瓷在 25 °C 至 120 °C 温度范围内的介电损耗（tan δ）值均小于 0.03。此外，还讨论了上述温度范围内的交流电导率、阻抗光谱研究以及基于阿伦尼乌斯图的传导机制。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.