Piezoelectrics & Acoustooptics, Volume. 42, Issue 6, 810(2020)

Study on Preparation and Properties of SnO2 Varistor Ceramics Doped with MnO2

LIANG Wenxin1... ZHAO Hongfeng1, KANG Jiashuang1, WANG Hao1, ZHOU Yuanxiang1 and XIE Qingyun2 |Show fewer author(s)
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
  • show less

    The SnO2-ZnO-Ta2O5 based varistor ceramics was prepared by partial replacement of ZnO with MnO2. The effects of Zn and Mn co-doping on the microstructure and electrical properties of SnO2 were investigated. The experimental results showed that the substitution of ZnO with a small amount of MnO2 could improve the nonlinear performance of the samples and significantly increase the voltage gradient. When the MnO2 doping amount was 0.25%, the nonlinearity of the sample reaches 21.37, the voltage gradient was 422 V/mm, and the leakage current was 72.12 μA/cm2. The main reason for the change was that Mn supplements the original insoluble portion of ZnO in the SnO2 lattice, and undergoes the solid solution reaction to generate the acceptor defect ion Mn″Sn, which promotes the formation of the potential barrier. At the same time, Mn has low solubility in SnO2 lattice, so it was easy to segregate and precipitate on grain boundary layer, which hinders grain growth and increases voltage gradient.

    Tools

    Get Citation

    Copy Citation Text

    LIANG Wenxin, ZHAO Hongfeng, KANG Jiashuang, WANG Hao, ZHOU Yuanxiang, XIE Qingyun. Study on Preparation and Properties of SnO2 Varistor Ceramics Doped with MnO2[J]. Piezoelectrics & Acoustooptics, 2020, 42(6): 810

    Download Citation

    EndNote(RIS)BibTexPlain Text
    Save article for my favorites
    Paper Information

    Received: Jun. 20, 2020

    Accepted: --

    Published Online: Apr. 21, 2022

    The Author Email:

    DOI:10.11977/j.issn.1004-2474.2020.06.018

    Topics