Effects of praseodymium doping on thermoelectric transport properties of CaMnO3 compound system
来源期刊：JOURNAL OF RARE EARTHS2013年第9期
论文作者：张飞鹏 牛保成 张坤书 张忻 路清梅 张久兴
文章页码：885 - 890
摘 要：The rare earth Pr doped Ca1-x Prx MnO3（x=0,0.06,0.08,0.1,0.12,and 0.14） compound bulk samples were prepared to study the effect of Pr doping on thermoelectric transport properties of CaMnO3 compound system.The doped samples exhibited single phase composition within the experimental doping range,with condensed bulk microstructure and small porosities.The electrical resistivity was remarkably reduced for doped samples,on account of the enhanced carrier concentration;the absolute value of Seebeck coefficient was deteriorated mainly due to enhanced electron carrier concentration.The electrical performances of the doped samples reflected by resistivity and Seebeck coefficient fluctuations were optimistically tuned,with an optimized power factor value of 0.342 mW/（m·K2） at 873 K for x=0.08 sample,which was very much higher comparing with that of the un-doped sample.The lattice thermal conduction was really confined,leading to distinctly repressed total thermal conductivity.The thermoelectric performance was noticeably improved by Pr doping and the dimensionless figure of merit ZT for the Ca0.92 Pr0.08 MnO3 compound was favorably optimized with the maximum value 0.16 at 873 K.
张飞鹏1,2，牛保成1，张坤书1，张忻2，路清梅2，张久兴2
1. Institute of Physics,Henan University of Urban Construction2. Key Laboratory of Advanced Functional Materials,Chinese Ministry of Education,College of Materials Science and Engineering,Beijing University of Technology
摘 要：The rare earth Pr doped Ca1-x Prx MnO3（x=0,0.06,0.08,0.1,0.12,and 0.14） compound bulk samples were prepared to study the effect of Pr doping on thermoelectric transport properties of CaMnO3 compound system.The doped samples exhibited single phase composition within the experimental doping range,with condensed bulk microstructure and small porosities.The electrical resistivity was remarkably reduced for doped samples,on account of the enhanced carrier concentration;the absolute value of Seebeck coefficient was deteriorated mainly due to enhanced electron carrier concentration.The electrical performances of the doped samples reflected by resistivity and Seebeck coefficient fluctuations were optimistically tuned,with an optimized power factor value of 0.342 mW/（m·K2） at 873 K for x=0.08 sample,which was very much higher comparing with that of the un-doped sample.The lattice thermal conduction was really confined,leading to distinctly repressed total thermal conductivity.The thermoelectric performance was noticeably improved by Pr doping and the dimensionless figure of merit ZT for the Ca0.92 Pr0.08 MnO3 compound was favorably optimized with the maximum value 0.16 at 873 K.
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