Rietveld refinement and thermoelectric properties of ytterbium doped Ca1-xYbxMnO3 (x=0~0.2) compounds - 文章详情页

作者：

Lu, Q. (Lu, Q..) | Zhang, B. (Zhang, B..) | Zhang, F. (Zhang, F..) | Zhang, X. (Zhang, X..) | Zhang, J. (Zhang, J..)

收录：

Scopus PKU CSCD

摘要：

A　series　of　Yb-substituted　Ca1-xYbxMnO3　(x=0~0.2)　solutions　with　perovskite　structure　were　synthesized　via　sol-gel　and　non-pressure　sintering　method,　and　the　influence　of　Yb-doping　on　phase,　crystal　structure,　microstructure　and　thermoelectric　performance　were　investigated　systematically　based　on　X-ray　Rietveld　refinement,　SEM,　and　thermoelectric　properties　measuring　system.　The　refinement　showed　that　the　Yb-substitution　for　Ca　site　led　to　lattice　distortion　of　CaMnO3,　and　so　the　Mn-O2-Mn　angles　(distortion　of　oxygen-octahedron　parallel　to　ac　plane)　decreased　with　increasing　content　of　Yb.　Substituting　the　Ca　site　with　rare　earth　Yb　caused　a　strong　decrease　of　resistivity　and　changed　the　transport　characteristic;　Seebeck　coefficient　value　decreased　with　further　doping　of　Yb.　In　addition,　Yb-substitution　restrained　grain　growth　and　its　larger　mass　and　secondary　phase　decreased　thermal　conductivity.　As　a　result,　ZT　value　of　sample　with　x=0.1　reached　its　peak　of　0.093　at　700　K　which　was　about　120%　higher　than　CaMnO3.

关键词：

Perovskite; Rare earths; Reitveld refinement; Substitution; Thermoelectric properties

作者机构：

[ 1 ] [Lu, Q.]College of Materials Science and Engineering, Beijing University of Technology, Key Laboratory of Advanced Functional Materials, Beijing 100124, China
[ 2 ] [Zhang, B.]College of Materials Science and Engineering, Beijing University of Technology, Key Laboratory of Advanced Functional Materials, Beijing 100124, China
[ 3 ] [Zhang, F.]College of Materials Science and Engineering, Beijing University of Technology, Key Laboratory of Advanced Functional Materials, Beijing 100124, China
[ 4 ] [Zhang, X.]College of Materials Science and Engineering, Beijing University of Technology, Key Laboratory of Advanced Functional Materials, Beijing 100124, China
[ 5 ] [Zhang, J.]College of Materials Science and Engineering, Beijing University of Technology, Key Laboratory of Advanced Functional Materials, Beijing 100124, China

通讯作者信息：

[Lu, Q.]College of Materials Science and Engineering, Beijing University of Technology, Key Laboratory of Advanced Functional Materials, Beijing 100124, China

电子邮件地址：

qmlu@bjut.edu.cn

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