采用溶胶-凝胶法成功制备了La0.67Ca0.33MnO3粉末,并通过改变预烧温度获取电学性能优异的陶瓷.利用X射线衍射(XRD)、扫描电子显微镜(SEM)、四探针法对不同预烧温度处理后的La0.67Ca0.33MnO3陶瓷的物相、结构、微观形貌和电学性能进行测试,分析预烧温度对材料的晶粒尺寸和电学性能的影响,从而摸索出最佳预烧温度.实验结果表明:样品的结晶性能好物相纯,随着预烧温度的增加,晶粒尺寸、致密度、收缩率和电阻温度系数(TCR)在不断减小,电阻率先减小后增加.在300℃预烧,1450℃烧结得到的样品具有较高的TCR值达到了40.8％·K-1.
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