烧结温度对Ba2LaBiO6/ZnO复相材料的微观形貌和电性能的影响

Effect of Sintering Temperature on the Micromorphology and Electrical Properties of Ba2LaBiO6/ZnO Composite

通过选取ZnO掺杂Al2O3的固溶体材料为低阻相,Ba2LaBiO6材料为高B值高阻相制备复相材料,研究原料成分、烧结温度对材料的晶相组成、微观形貌和电性能的影响规律,利用XRD和SEM进行分析,并获取可靠的制备工艺参数。试验结果显示:Ba2LaBiO6/ZnO复相材料体系具有明显的NTC(负温度系数)性能,材料的最佳烧结温度为1050~1100℃。随着烧结温度的升高,样品的晶粒尺寸增大,材料趋向致密,呈现规则的几何形状。室温电阻率ρ25由1000℃的8.65×105Ω·cm减小到1100℃的1.35×104Ω·cm,材料的B25/125系数值基本不变。

By selecting the ZnO-doped Al2O3 solid solution material as the low-resistance phase and the Ba2LaBiO6 material as the high-B value and high-resistance phase to prepare the multiphase material,this paper studies the effect of raw material composition and sintering temperature on the crystal phase composition,microscopic morphology and electrical properties of the material.The influence law is analyzed by XRD and SEM,and reliable preparation process parameters are obtained.The test results show that the Ba2LaBiO6/ZnO composite material system has obvious NTC(Negative Temperature Coefficient)performance,and the optimal sintering temperature of the material is 1050~1100℃.With the increase of the sintering temperature,the grain size of the sample increases,and the material tends to be dense,showing a regular geometric shape.The room temperature resistivityρ25 is reduced from 8.65×105Ω·cm at 1000℃to 1.35×104Ω·cm at 1100℃,and the B25/125 coefficient value of the material is basically unchanged.