Structural and Thermoelectric properties of BaRCo4O7 (R=Dy, Ho, Er, Tm,Yb, and Lu)

Published

December 6, 2011

Author(s)

Winnie K. Wong-Ng, Wenjie Xie, Yonggao Y. Yan, Guangyao Liu, James A. Kaduk, Evans L. Thomas, Terry M. Tritt

Abstract

The structure and thermoelectric properties of a series of barium lanthanide cobaltites, BaRCo4O7 (R = Dy, Ho, Er, Tm,Yb, and Lu), which were prepared using the spark plasma synthesis (SPS) technique, have been investigated. The space group of these compounds was re-determined and confirmed to be P31c instead of the reported P63mc. The lattice parameters a and c range from 6.26279(2) Å to 6.31181(6) Å, and from 10.22468(6) Å to 10.24446(15) Å for R=Lu to Dy, respectively. The crystal structure of BaRCo4O7 is built up from Kagome sheets of CoO4 tetrahedra, linked by triangular layers of CoO4 tetrahedra. The values of figure of merit (ZT) of the BaRCo4O7 samples were determined to be around 0.02 at 800 K. X-ray diffraction patterns of these samples have been determined and submitted to the Powder Diffraction File (PDF).

Citation

Solid State Sciences

Volume

110

Pub Type

Journals

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DOI Link

Keywords

barium lanthanide cobaltites, BaRCo4O7 (R = Dy, Ho, Er, Tm, Yb, and Lu), thermoelectric properties, crystal structure, X-ray powder pattern

Citation

Wong-Ng, W. , Xie, W. , Yan, Y. , Liu, G. , Kaduk, J. , Thomas, E. and Tritt, T. (2011), Structural and Thermoelectric properties of BaRCo4O7 (R=Dy, Ho, Er, Tm,Yb, and Lu), Solid State Sciences, [online], https://doi.org/10.1063/1.3663526 (Accessed October 30, 2025)