The Grain Growth Control of ZnO-V2O5 Based Varistors by PrMnO3 Addition

Micromachines

Yu Shi¹  Shengli An¹  Jinxiao Bao¹  Maofeng Xu¹  Changkun Cai¹  Yuanyuan Liu¹  Jun Peng¹  Manyi Xie¹  Yanlong Wu¹ 

[1] School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China;

关键词: abnormal grain growth;    ZnO;    V₂O₅;    varistor;   

DOI  :  10.3390/mi13020214

来源: DOAJ

【 摘 要 】

In this study, the grain growth behaviour of ZnO-V₂O₅-based ceramics with 0.25–0.75 mol% additions of PrMnO₃ was systematically investigated during sintering from 850 °C to 925 °C. with the aim to control the ZnO grain size for their application as varistors. It was found that with the increased addition of PrMnO₃, in addition to the decrease in the average grain size, the grain size distribution also narrowed and eventually changed from a bimodal to unimodal distribution after a 0.75 mol% PrMnO₃ addition. The grain growth control was achieved by a pinning effect of the secondary ZnCr₂O₄ and PrVO₄ phases at the ZnO grain boundaries. The apparent activation energy of the ZnO grain growth in these ceramics was found to increase with increased additions of PrVO₄, hence the observed reduction in the ZnO grain sizes.

【 授权许可】

Unknown