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

Bulletin of materials science

Choon-W Nahm¹ 

[1] Semiconductor Ceramics Laboratory, Department of Electrical Engineering, Dongeui University, Busan 614-714, Republic of Korea$$Semiconductor Ceramics Laboratory, Department of Electrical Engineering, Dongeui University, Busan 614-714, Republic of KoreaSemiconductor Ceramics Laboratory, Department of Electrical Engineering, Dongeui University, Busan 614-714, Republic of Korea$$

关键词: ZnO;    varistors;    microstructure;    nonlinear electrical properties;    aging characteristics.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The electrical properties and stability of the varistors, which composed of (NiO, MgO, Cr₂O₃)- doped Znâ€�?�Prâ€�?�Coâ€�?�R (Y, Er) oxide-based ceramics, were investigated for different additives. The breakdown voltage of the varistors increased in order of NiO$ightarrow$undoped$ightarrow$MgO$ightarrow$Cr₂O₃: 1200$ightarrow$1551$ightarrow$1691$ightarrow$1959 V/cm for ZPCY system and undoped$ightarrow$NiO$ightarrow$MgO$ightarrow$Cr₂O₃: 1024$ightarrow$1041$ightarrow$1500$ightarrow$1668 V/cm for ZPCE system, respectively. The nonlinear coefficient value increased in order of undoped$ightarrow$NiO$ightarrow$MgO$ightarrow$Cr₂O₃: 21$ightarrow$25$ightarrow$38$ightarrow$50 in ZPCY system and NiO$ightarrow$undoped$ightarrow$MgO$ightarrow$Cr₂O₃: 27$ightarrow$32$ightarrow$35$ightarrow$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.

【 授权许可】

Unknown