• Nonlinear electrical properties and aging characteristics of (NiO, MgO, Cr2O3)-doped Zn–Pr–Co–R (R = Y, Er) oxide-based varistors

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    • Keywords


      ZnO; varistors; microstructure; nonlinear electrical properties; aging characteristics.

    • Abstract


      The electrical properties and stability of the varistors, which composed of (NiO, MgO, Cr2O3)- doped Zn–Pr–Co–R (Y, Er) oxide-based ceramics, were investigated for different additives. The breakdown voltage of the varistors increased in order of NiO$\rightarrow$undoped$\rightarrow$MgO$\rightarrow$Cr2O3: 1200$\rightarrow$1551$\rightarrow$1691$\rightarrow$1959 V/cm for ZPCY system and undoped$\rightarrow$NiO$\rightarrow$MgO$\rightarrow$Cr2O3: 1024$\rightarrow$1041$\rightarrow$1500$\rightarrow$1668 V/cm for ZPCE system, respectively. The nonlinear coefficient value increased in order of undoped$\rightarrow$NiO$\rightarrow$MgO$\rightarrow$Cr2O3: 21$\rightarrow$25$\rightarrow$38$\rightarrow$50 in ZPCY system and NiO$\rightarrow$undoped$\rightarrow$MgO$\rightarrow$Cr2O3: 27$\rightarrow$32$\rightarrow$35$\rightarrow$38 in ZPCE system, respectively. In ZPCY and ZPCE systems, the Cr2O3-additives most greatly improved the nonlinear properties. In Cr2O3-doped system, ZPCY system exhibited higher nonlinear properties than that of ZPCE system. The stability against d.c. accelerated aging stress was higher in Cr2O3-additives than in NiO- and MgO-additives for ZPCY system and was higher in NiO-additives than in MgO- and Cr2O3-additives for ZPCE system.

    • Author Affiliations


      Choon-W Nahm1

      1. Semiconductor Ceramics Laboratory, Department of Electrical Engineering, Dongeui University, Busan 614-714, Republic of Korea
    • Dates

  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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