Preparation and dielectric properties of La doped NBCCTO ceramics

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Electroceramics Pub Date : 2022-03-25 DOI:10.1007/s10832-022-00280-z

Qi Hu, Jiayuan Tang, Yuancheng Teng, Xiaofeng Zhao, Temirlan Arslanov, Rajeev Ahuja

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引用次数: 1

Abstract

CaCu₃Ti₄O₁₂ ceramics have great dielectric constant, excellent temperature stability and good frequency stability. However, due to high dielectric loss, its practical application in engineering is hindered. In this paper, Na_0.25Bi_0.25La_xCa_0.5-3x/2Cu₃Ti₄O₁₂ (NBLCCTO) ceramics were prepared by solid phase synthesis. The effects of sintering temperature and La content on dielectric properties of NBLCCTO ceramics were studied. The results show when the sintering temperature is 1030℃ and La content is 0.05, NBLCCTO ceramics show better dielectric properties. Its dielectric constant has ε_r = 22,231 at 1 kHz and its dielectric loss is 0.0546 at 10 kHz. Appropriate doping of La can lead to grain refinement and enlarge specific surface area of grain boundary, thus increasing resistivity and reducing dielectric loss. Therefore, NBLCCTO ceramics have lower dielectric loss than Na_0.25Bi_0.25Ca_0.5Cu₃Ti₄O₁₂ (NBCCTO).

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La掺杂NBCCTO陶瓷的制备及其介电性能

CaCu3Ti4O12陶瓷具有较大的介电常数、优异的温度稳定性和良好的频率稳定性。但由于介质损耗大，阻碍了其在工程上的实际应用。本文采用固相合成法制备了Na0.25Bi0.25LaxCa0.5-3x/2Cu3Ti4O12 (NBLCCTO)陶瓷。研究了烧结温度和La含量对NBLCCTO陶瓷介电性能的影响。结果表明，当烧结温度为1030℃，La含量为0.05时，NBLCCTO陶瓷具有较好的介电性能。在1 kHz时介电常数εr = 22231，在10 kHz时介电损耗为0.0546。适当掺杂镧可以细化晶粒，扩大晶界比表面积，从而提高电阻率，降低介电损耗。因此，NBLCCTO陶瓷具有比Na0.25Bi0.25Ca0.5Cu3Ti4O12 (NBCCTO)更低的介电损耗。

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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.