The effects of MnO2 on the microstructure and electrical properties based on ZnO-Bi2O3-Sb2O3-Cr2O3-Co2O3 varistors

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Electroceramics Pub Date : 2024-09-06 DOI:10.1007/s10832-024-00360-2

Xiaolong Huang, Jiaqi Li, Guangxu Pan, Dachuan Zhu

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Abstract

In this work, nano ZnO powders, Bi₂O₃, Sb₂O₃, Cr₂O₃, Co₂O₃ and a various content of MnO₂ were blended thoroughly and pre-calcined at 800℃ and then pressed in to pellets which were sintered at 950℃ to form varistor ceramics. Subsequently, the effects of MnO₂ on the microstructure and electrical properties of the ZnO-based varistor were investigated. It was found that the amount of spinel phase (Zn₇Sb₂O₁₂) and Bi₂O₃ phase increased with the MnO₂ increasing, while the content of pyrochlore (Zn₂Bi₃Sb₃O₁₄) phase decreased. As a result, the growth of ZnO grain was reduced with the average grain size from 9.5 μm down to 5.3 μm, leading to the increase of breakdown field of ZnO-based varistor. Particularly, the ZnO-based varistor with 1.2 mol% MnO₂ exhibited the best comprehensive electrical performance with the breakdown field E_b of 901.4 V/mm, the nonlinear coefficient α of 66.7 and the leakage current density J_L of 1.1 µA/cm².

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基于 ZnO-Bi2O3-Sb2O3-Cr2O3-Co2O3 变阻器的 MnO2 对微结构和电气性能的影响

在这项研究中，纳米氧化锌粉末、Bi2O3、Sb2O3、Cr2O3、Co2O3 和不同含量的 MnO2 被充分混合并在 800℃ 下预煅烧，然后压制成颗粒，在 950℃ 下烧结形成压敏电阻陶瓷。随后，研究了 MnO2 对氧化锌压敏电阻器微观结构和电气性能的影响。研究发现，尖晶石相（Zn7Sb2O12）和 Bi2O3 相的含量随着 MnO2 的增加而增加，而火成岩相（Zn2Bi3Sb3O14）的含量则减少。因此，氧化锌晶粒的生长减小，平均晶粒大小从 9.5 μm 减小到 5.3 μm，导致氧化锌基变阻器的击穿场强增大。尤其是含有 1.2 mol% MnO2 的氧化锌基变阻器表现出最佳的综合性能，击穿场强 Eb 为 901.4 V/mm，非线性系数 α 为 66.7，漏电流密度 JL 为 1.1 µA/cm2。

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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.