【摘要】 研究了烧结温度对TiO2压敏陶瓷的显微结构、显微成分、势垒结构和电学性能的影响。采用SEM和EDS测试其显微结构和晶粒的化学组成。根据热电子发射理论和电学性能计算了势垒结构。在1350℃烧结的TiO2压敏陶瓷具有均匀而致密的显微结构,其晶粒大小为15μm左右,施主掺杂Nb5+在TiO2晶粒中的固溶度为1.49%;势垒高度?B为0.28eV,势垒宽度xD为48nm;压敏电压V1mA为5.25V/mm,非线性系数α为4.2,εr为1.1×104。更多还原

【Abstract】 The effects of sintering temperature on microstructure, micro-composition, barrier structure and electrical properties of TiO2 varistor ceramics were investigated. Microstructures and grain’s chemistry compositions of samples were tested by SEM and EDS methods. Based on the thermoelectronic emission theory, barrier structure of samples was calculated by analyzing electrical properties of samples. The sample sintered at 1 350 ℃ exhibits a compact and homogeneous microstructure. The grains size of the TiO2 sample is about 15 μm, solid solubility of donor doping Nb5+ solute in TiO2 grains of 1.49 %, B of 0.28 eV, xD of 48 nm, V1mA of 5.25 V/mm, α of 4.2 and εr of 1.1×104.更多还原