Dy掺杂Ca1-x Dyx MnO3(x=0,0.02,0.03,0.05,0.10)热电材料的Rietveld精修及高温热电性能研究

本文采用共沉淀法制备Dy掺杂Ca_1-xDy_xMnO₃(x=0,0.02,0.03,0.05,0.10)热电材料,通过X射线衍射对热电材料进行物相结构表征,利用Rietveld粉末衍射全谱拟合方法对X射线衍射数据进行精修得到Dy掺杂Ca_1-xDy_xMnO₃(x=0,0.02,0.03,0.05,0.10)热电材料的精细结构,利用标准四探针法测试高温热电性能.Rietveld精修结果表明,随着Dy掺杂量的增加,CaMnO₃样品的晶胞参数及晶胞体积逐渐变大.对应的电阻率测量结果表明,掺杂样品的电阻率随着Dy掺杂量的增加而减小.其中Ca_0.9Dy_0.1MnO₃的室温电阻率最低,为6.7×10^-5 Ω·m,是未掺杂CaMnO₃的1/6倍.