稀土元素替代RBaCo_(2)O_(5+δ)热电陶瓷性能的影响  

Effects of Rare Earth Substitution on the Thermoelectric Properties of RBaCo_(2)O_(5+δ)Ceramics

作　　者：王娇[1,2] 王菲菲 郝好山[1,2] 王远 刘少辉[1,2] WANG Jiao;WANG Feifei;HAO Haoshan;WANG Yuan;LIU Shaohui(Henan Key Laboratory of Electronic Ceramic Materials and Application,College of Materials Engineering,Henan University of Engineering,Zhengzhou 451191,China;Henan International Joint Laboratory of Rare Earth Composite Materials,College of Materials Engineering,Henan University of Engineering,Zhengzhou 451191,China)

机构地区：[1]河南工程学院材料工程学院,河南省电子陶瓷材料与应用重点实验室,郑州451191 [2]河南工程学院材料工程学院,河南省稀土复合材料国际联合实验室,郑州451191

出　　处：《中国陶瓷》2023年第10期25-29,共5页China Ceramics

基　　金：国家自然科学基金项目(51902088);河南省高校科技创新人才项目(21HASTIT014);河南省优秀青年基金项目(212300410031);河南省科技攻关项目(222102240004)。

摘　　要：氧化物热电陶瓷具有高温稳定、环境友好、成本低等优点,受到人们的关注。利用陶瓷制备工艺制备了不同稀土元素替代R位元素的RBaCo_(2)O_(5+δ)氧化物热电陶瓷,研究了不同稀土元素替代对RBaCo_(2)O_(5+δ)热电性能的影响,结果表明:不同稀土元素替代的RBaCo_(2)O_(5+δ)热电陶瓷材料均形成双层钙钛矿结构,并没有形成第二相杂相。在测试温度范围内,PRBaCo_(2)O_(5+δ)、YbBaCo_(2)O_(5+δ)、GdBaCo_(2)O_(5+δ)热电陶瓷的Seebeck系数均表现为正值,表明不同稀土元素替代的RBaCo_(2)O_(5+δ)热电陶瓷均为p型半导体材料;与YbBaCo_(2)O_(5+δ)、GdBaCo_(2)O_(5+δ)热电陶瓷的电导率相比,PRBaCo_(2)O_(5+δ)热电陶瓷具有更高的电导率。PRBaCo_(2)O_(5+δ)热电陶瓷的功率因子明显高于YbBaCo_(2)O_(5+δ)、GdBaCo_(2)O_(5+δ)热电陶瓷的功率因子,PRBaCo_(2)O_(5+δ)热电陶瓷在1073 K有最大的功率因子43.9μW/mK^(2),较大离子半径稀土元素Pr替代有利于RBaCo_(2)O_(5+δ)热电陶瓷性能的提高。Oxide thermoelectric ceramics have attracted much attention because of their high temperature stability,environmental friendliness and low cost.RBaCo_(2)O_(5+δ)oxide thermoelectric ceramics with different rare earth elements replacing R-site elements was prepared by ceramic preparation process.The effects of different rare earth element substitutions on RBaCo_(2)O_(5+δ)were studied.The results show that RBaCo_(2)O_(5+δ)thermoelectric ceramic materials replaced by different rare earth elements all form double-layer perovskite structure.Within the test temperature range,the Seebeck coefficients of YbBaCo_(2)O_(5+δ),GdBaCo_(2)O_(5+δ)and PrBaCo_(2)O_(5+δ)thermoelectric ceramics are positive,indicating that RBaCo_(2)O_(5+δ)thermoelectric ceramics is replaced by different rare earth elements are all p-type semiconductor materials.Compared with the conductivity of YbBaCo_(2)O_(5+δ)and GdBaCo_(2)O_(5+δ)thermoelectric ceramics,PrBaCo_(2)O_(5+δ)thermoelectric ceramics have higher conductivity.And the power factor of PrBaCo_(2)O_(5+δ)thermoelectric ceramics is significantly higher than that of YbBaCo_(2)O_(5+δ)and GdBaCo_(2)O_(5+δ).The maximum power factor of PrBaCo_(2)O_(5+δ)thermoelectric ceramics is 43.9μW/mK^(2)at 1073 K.The replacement of rare earth element with larger ion radius is conducive to improve the thermoelectric performance of RBaCo_(2)O_(5+δ)ceramics.

关 键 词：RBaCo_(2)O_(5+δ) 热电性能 稀土替代 陶瓷 

分 类 号：TQ174.1[化学工程—陶瓷工业]