Effect of Cr2O3on the electrical properties of multicomponent ZnO varistors at the pre-breakdown region

✍ Scribed by S. A. Pianaro; E. C. Pereira; L. O. S. Bulhões; E. Longo; J. A. Varela

• Book ID: 104735694
• Publisher: Springer
• Year: 1995
• Tongue: English
• Weight: 855 KB
• Volume: 30
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00352142

✦ Synopsis

The effect of Or203 on the electrical properties of the multicomponent ZnO varistors was investigated using voltage-current curves and impedance spectroscopy. The structure and morphological modifications were analysed by X-ray diffraction and scanning electron microscopy, respectively. It was observed in samples with addition 0.1 mol % Or203 that there was an improvement in the electrical properties of the varistors, but the increase in concentration had a deleterious effect on the potential barrier at the grain boundary. The excess Cr2O 3 segregates at the grain-boundary region and increases the donor concentration, leading to a higher leakage current.