M0.05Ca0.95MnO3的制备及其热电性能

摘要

采用溶胶-凝胶法，以硝酸盐为原料，在常压空气气氛中于1 000℃烧结8 h制备出CaMnO3和M0.05Ca0.95MnO3(M=Sr2+，Sm3+)块体材料。利用X线衍射、扫描电子显微镜等研究材料的物相和微观形貌，考察Sr2+和Sm3+M+掺杂对CaMnO3的高温热电性能参数Seebeck系数、电阻率和功率因子的影响。研究结果表明：制备的样品具有单一的物相，结构致密；金属离子Sr2+和Sm3+掺杂可以有效地改善其热电性能；当Sm3+的掺杂量为0.05时可获得最佳的热电性能，600℃时功率因子为23×10-5W·m-1·K-2。%CaMnO3 and M0.05Ca0.95MnO3 (M=Sr2+, Sm3+) samples were synthesized by sol-gel method and sintered in air at 1 000 "C for 8 h with nitrates as starting materials. The phase composition and microstructure were studied by XRD and SEM. Thermoelectric properties such as the Seebeck coefficient, electrical resistivity and power factor of M0.05Ca0.95MnO3 samples were studied. The results show that theM0.05Ca0.95MnO3 samples have single phase and condensed microstructure. The samples substituted by metal ions(Sr2+, Sm3+) enhance the electrical transmission performance effectively, and the highest power factor is 23×10-5 W·m-1·K-2 at 600 ℃ for the sample of Sm0.05Ca0.95MnO3.