Nonlinear electrical properties and aging characteristics of (NiO, MgO, Cr_{2}O_{3})-doped Zn–Pr–Co–R (R = Y, Er) oxide-based varistors
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The electrical properties and stability of the varistors, which composed of (NiO, MgO, Cr_{2}O_{3})- 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$\rightarrow$Cr_{2}O_{3}: 1200$\rightarrow$1551$\rightarrow$1691$\rightarrow$1959 V/cm for ZPCY system and undoped$\rightarrow$NiO$\rightarrow$MgO$\rightarrow$Cr_{2}O_{3}: 1024$\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$Cr_{2}O_{3}: 21$\rightarrow$25$\rightarrow$38$\rightarrow$50 in ZPCY system and NiO$\rightarrow$undoped$\rightarrow$MgO$\rightarrow$Cr_{2}O_{3}: 27$\rightarrow$32$\rightarrow$35$\rightarrow$38 in ZPCE system, respectively. In ZPCY and ZPCE systems, the Cr_{2}O_{3}-additives most greatly improved the nonlinear properties. In Cr_{2}O_{3}-doped system, ZPCY system exhibited higher nonlinear properties than that of ZPCE system. The stability against d.c. accelerated aging stress was higher in Cr_{2}O_{3}-additives than in NiO- and MgO-additives for ZPCY system and was higher in NiO-additives than in MgO- and Cr_{2}O_{3}-additives for ZPCE system.
Choon-W Nahm^{1} ^{}
Volume 43, 2020
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