【摘要】 以柠檬酸为螯合剂,硝酸盐和氧化物为原料,通过自蔓延法合成了Ca_2.95Sm_0.05Co_3.995-xNi_0.005Fe_xO_9+δ（x=0、0.10、0.15、0.20）陶瓷粉体材料,并对Ca_2.95Sm_0.05Co_3.995-xNi_0.005Fe_xO_9+δ（x=0.10）粉体进行了压制实验;在473⁹73 K温度范围内,探索了Ca_2.95Sm_0.05Co_3.995-xNi_0.005Fe_xO_9+δ的热电性能。结果表明:Ca_2.95Sm_0.05Co_3.995-xNi_0.005Fe_xO_9+δ陶瓷粉体的压制规律符合黄培云压制方程,压制模量M为1.86 MPa,非线性指数m为2.074;材料的电导率和Seebeck系数随温度的升高而升高;热导率随温度的升高而降低;在973 K时,Ca_2.95Sm_0.05Co_3.995-xNi_0.005Fe_xO_9+δ的ZT值达到0.13。Ca_2.95Sm_0.05Co_3.995-xNi_0.005Fe_xO_9+δ是具有潜在应用前景的热电材料。更多还原

【Abstract】 Ca_2.95Sm_0.05Co_3.995-xNi_0.005Fe_xO_9+δ（х=0,0.10,0.15,0.20） ceramic material was prepared by self propagation process using citric acid as chelating agent,nitrate and oxide as oxidant. The synthesized powders Ca_2.95Sm_0.05Co_3.995-xNi_0.005Fe_xO_9+δ（x=0.10）were compacted. The thermoelectric properties of Ca2.95Sm0.05Co3.995-x Ni0.005FexO9 + δwere explored from 473 K to 973 K. The results show that the compression law of Ca2.95Sm0.05Co3.995-x Ni0.005FexO9 + δis in accordance with HUANG Pei-yun equation with compaction module of 1.86 MPa and nonlinear exponent of 2.074,respectively. The electrical conductivity and Seebeck coefficient of the material increase with the increase of temperature,while the thermal conductivity decreases with the temperature increasing. The ZT value of Ca_2.95Sm_0.05Co_3.995-xNi_0.005Fe_xO_9+δsample is 0.13 at 973 K. Ca_2.95Sm_0.05Co_3.995-xNi_0.005Fe_xO_9+δis promising thermoelectric material.更多还原