自蔓延法制备Ca_(2.95)Sm_(0.05)Co_(3.995-x)Ni_(0.005)Fe_xO_(9+δ)及其热电性能的研究  

Study on thermoelectric properties of Ca_(2.95)Sm_(0.05)Co_(3.995-x)Ni_(0.005)Fe_xO_(9+δ) by selfpropagation process

作　　者：仲洪海[1] 单娜[1] 倪狄 牟浩瀚 蒋阳[1] 余大斌[2] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]解放军电子工程学院,安徽合肥230037

出　　处：《粉末冶金工业》2017年第1期1-6,共6页Powder Metallurgy Industry

基　　金：国家自然科学基金资助项目(61076040);安徽省自然科学基金资助项目(1308085ME71)

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_(2.95)Sm_(0.05)Co_(3.995-x)Ni_(0.005)Fe_xO_(9+δ)(x=0、0.10、0.15、0.20)陶瓷粉体材料,并对Ca_(2.95)Sm_(0.05)Co_(3.995-x)Ni_(0.005)Fe_xO_(9+δ)(x=0.10)粉体进行了压制实验;在473~973 K温度范围内,探索了Ca_(2.95)Sm_(0.05)Co_(3.995-x)Ni_(0.005)Fe_xO_(9+δ)的热电性能。结果表明:Ca_(2.95)Sm_(0.05)Co_(3.995-x)Ni_(0.005)Fe_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_(2.95)Sm_(0.05)Co_(3.995-x)Ni_(0.005)Fe_xO_(9+δ)的ZT值达到0.13。Ca_(2.95)Sm_(0.05)Co_(3.995-x)Ni_(0.005)Fe_xO_(9+δ)是具有潜在应用前景的热电材料。Ca2.95Sm0.05Co3.995-xNi0.005FexO9＋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 Ca2.95Sm0.05Co3.995-xNi0.005FexO9＋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 Ca2.95Sm0.05Co3.995-xNi0.005FexO9＋δsample is 0.13 at 973 K. Ca2.95Sm0.05Co3.995-xNi0.005FexO9＋δis promising thermoelectric material.

关 键 词：自蔓延法 热电性能 功率因子 

分 类 号：TB34[一般工业技术—材料科学与工程]