Thumbnail
Access Restriction
Open

Author Zhu, Yuanhu ♦ Wang, Chunlei ♦ Su, Wenbin ♦ Liu, Jian ♦ Li, Jichao ♦ Zhang, Xinhua ♦ Mei, Liangmo
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ CALCIUM COMPOUNDS ♦ CARRIER MOBILITY ♦ CERAMICS ♦ COMPARATIVE EVALUATIONS ♦ DYSPROSIUM COMPOUNDS ♦ ELECTRIC CONDUCTIVITY ♦ HOLMIUM COMPOUNDS ♦ LANTHANUM COMPOUNDS ♦ MANGANATES ♦ SAMARIUM COMPOUNDS ♦ SEEBECK EFFECT ♦ SINTERING ♦ SOLIDS ♦ THERMAL CONDUCTIVITY ♦ THERMOELECTRIC PROPERTIES
Abstract Ca{sub 0.98}Dy{sub 0.02}MnO{sub 3} and Ca{sub 0.96}Dy{sub 0.02}Re{sub 0.02}MnO{sub 3} (Re=La, Pr, Sm, Eu, Ho, and Yb) have been synthesized by the solid state reaction method. Samples with relative densities all over 96% have been obtained. Thermoelectric properties are evaluated between 300 and 1000 K. The electrical resistivity shows a typical metal-like conductivity behavior, and at high temperature, 973 K, decreases from 36.1 mΩ cm for Ca{sub 0.98}Dy{sub 0.02}MnO{sub 3} to 8.6 mΩ cm for Ca{sub 0.96}Dy{sub 0.02}Yb{sub 0.02}MnO{sub 3}. Both the absolute values of Seebeck coefficient and thermal conductivity are reduced by the introduction of second rare-earth element. The highest power factor of 415 μW/(K{sup 2}m) is obtained for Ca{sub 0.96}Dy{sub 0.02}Yb{sub 0.02}MnO{sub 3} sample, resulting in the highest dimensionless figure of merit (ZT) 0.25 at 973 K. This value shows an improvement of 144% compared with that of Ca{sub 0.98}Dy{sub 0.02}MnO{sub 3} ceramics at the same temperature. - Graphical abstract: The Ca{sub 0.96}Dy{sub 0.02}Re{sub 0.02}MnO{sub 3} (Re=La, Pr, …, Yb) were prepared by solid state reaction. Highest ZT value obtained is 0.25 at 973 K for Re=Yb, which shows 144% improvement compared with Ca{sub 0.98}Dy{sub 0.02}MnO{sub 3}. - Highlights: • Ca{sub 0.96}Dy{sub 0.02}Re{sub 0.02}MnO{sub 3} (Re=La, Pr, …, Yb) are produced by solid state reaction. • Lowest resistivity is obtained due to the highest carrier mobility for Re=Yb. • Highest power factor obtained is 415 μW/(K{sup 2}m) at 973 K for Re=Yb. • Highest ZT value obtained is 0.25 at 973 K for Ca{sub 0.96}Dy{sub 0.02}Yb{sub 0.02}MnO{sub 3} sample.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-05-15
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 225


Open content in new tab

   Open content in new tab