V~(5+)-Sr~(2+)共掺杂对TiO_2基压敏陶瓷性能的影响

研究了V~(5+)-Sr~(2+)共掺杂对TiO_2基压敏陶瓷电学性能的影响。采用固相烧结方法制备V~(5+)-Sr~(2+)共掺杂TiO_2样品。利用XRD衍射仪检测物相和SEM测定显微结构。用压敏电阻直流参数仪测定V~(5+)-Sr~(2+)共掺杂TiO_2样品在不同烧结温度和掺杂量下的电学性能。结果表明:掺杂0.35mol%的V_2O_5,XRD衍射仪没有检测到第二相的产生。随着SrCO_3掺杂量以及烧结温度的增加,样品压敏电压和非线性系数都有不同的变化趋势。当烧结温度为1 300℃、Sr~(2+)掺杂量为0.5mol%时,样品的各项电学性能最优:V~(5+)-Sr~(2+)共掺杂TiO_2样品压敏电压达到16.3V/mm,非线性系数α达到5.6。

Effect of V5+-Sr2+ co-doping on properties of TiO2 varistors ceramics

Effect of co-doping V5+-Sr2+ on the properties of TiO2 varistors ceramic was studied.V5+-Sr2+ co-doped TiO2 samples were prepared by adopting the solid phase sintering method.XRD and SEM were carried out to measured the microstructure and chemical composition of V5+-Sr2+ co-doping TiO2.Based on different sintering temperatures and V5+-Sr2+ co-doping content,electrical properties of V5+-Sr2+ were tested out by using the parameters instrument.The results show that secondary phase is observed in V5+-Sr2+ doped TiO2 samples when the V2O5 doped amount is 0.35 mol%.With SrCO3 doping content and sintering temperature increasing,varistor voltage and nonlinear coefficient of V5+-Sr2+ co-doped TiO2 samples present different trends to change.0.5 mol% Sr2+ doped samples sintered at 1300℃ possess the optimal properties with a voltage of 16.3 V/mm and a nonlinear coefficient of 5.6.