Authors: GuoZhong Zang XiaoFei Wang HuanHuan Liu FengZi Zhou LiBen Li
Publish Date: 2016/05/25
Volume: 27, Issue: 9, Pages: 9836-9841
Abstract
1 − xSnO2–xZn2SnO4 ceramic matrix composites with x = 015 020 025 and 030 are prepared by traditional ceramic processing The varistor and dielectric properties have been measured before and after heat treatment in vacuum and atmosphere Before heat treatment the ceramic with x = 020 has good nonlinear electrical property α = 55 low breakdown electric field E 10 = 74 V/mm and giant permittivity 40 Hz 40 °C ε r = 2 × 104 However the good varistor and dielectric properties are greatly degraded after vacuum treatment By a following heat treating in atmosphere the degradations of the electrical properties are restored except the high permittivity The results strongly suggest that varistor and dielectric properties are related to oxygen and/or oxygen vacancies Reference to the sintering behavior the original mechanism of oxygen vacancies in SnO2–Zn2SnO4 ceramic composites is proposed and accordingly the varistor and giant permittivity properties are well understood based on the grain boundary barrier model
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