CaMnO₃热电材料作为一种能直接实现热能与电能转换的媒介的环境友好新型材料而倍受青睐，但其较大的电阻率影响了热电性能的进一步提高。在钙位掺杂高价态稀土金属离子是降低其电阻率的有效途径。采用共沉淀法制备了一系列Ca_1-xPr_xMnO₃（x=0、0.01、0.03、0.05、0.10）热电材料。利用XRD对材料的物相进行表征，利用四探针法同时测量了CaMnO₃材料的电阻率。XRD结果显示，所有样品都为单相CaMnO₃结构，且随着Pr掺杂量的增大，样品的晶胞参数和晶胞体积变大。样品的电阻率随着Pr掺杂量的增加而变小，Ca_0.9Pr_0.1MnO₃的室温电阻率最小，为0.70×10^-4 Ω·m。

With the increasing environmental pollution,CaMnO₃ thermoelectric material has become more and more important because it can convert thermal energy into electrical energy.However,its larger resistivity hinders the further improvement of its thermoelectric properties.Doping high valence rare earth metal ions at calcium sites is an effective way to reduce its resistivity.Ca_1-xPr_xMnO₃(x=0,0.01,0.03,0.05,0.10) thermoelectric material is prepared through co-precipitation method and its high-temperature electrical transportation properties are investigated.The phase structure of the samples is characterized by means of XRD.The electrical resistivity of samples is determined by four-probe method.XRD analysis indicates that all the samples have single-phase CaMnO₃ structure.Both unit cell parameters and cell volume increase with the increase of Pr doping amount.Increasing Pr doping amount leads to a significant decrease in electrical resistivity.Ca_0.9Pr_0.1MnO₃ exhibits the lowest electrical resistivity,7×10^-3 W·m^-1·K^-2 at room temperature.

李翠芹(1977-),女,博士研究生,研究方向为能源材料,licuiqin2345@163.com