【摘 要】
：
利用溶胶-凝胶法制备了Ca2+和Mn2+共掺杂Ba1-xSrxTiO3(BST)固溶体.采用TG-DTA热分析、XRD衍射和TEM透射电镜对其进行了表征,并研究了热处理温度和外加直流偏压对其电学性能的
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利用溶胶-凝胶法制备了Ca2+和Mn2+共掺杂Ba1-xSrxTiO3(BST)固溶体.采用TG-DTA热分析、XRD衍射和TEM透射电镜对其进行了表征,并研究了热处理温度和外加直流偏压对其电学性能的影响.XRD显示,Ca2+和Mn2+共掺杂没有改变BST的结构.TEM照片揭示了热处理温度对其形貌的影响.阻温特性曲线显示,在低频时它显示正温度系数效应(PTC),在其它频率则显示负温度系数效应(NTC)电阻与电压关系显示,低频时它呈现电阻特性,而高频时则显示容抗特性.这些结果说明,掺杂能调节BST材料的电学性能;这些现象可以用晶界电阻效应,Heywang模型和离子极化理论来解释.
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