Thermoelectric and Structural Characterization of Ba2Ho(Cu3-xCox)O6+y

Published

June 13, 2009

Author(s)

Winnie K. Wong-Ng, Z Yang, Y F. Hu, Qingzhen Huang, Nathan Lowhorn, Makoto Otani, James A. Kaduk, Martin L. Green, Q Li

Abstract

The search for thermoelectric materials for power generation and for solid-state cooling have led to the increased interest of layered cobalt-containing oxides because of their thermal stability at high temperature and their desirable thermoelectric properties. This paper examines the effect of substitution of Co in the layered perovskite, Ba2Ho(Cu3-xCox)O6+y (x=0.0, 0.3, 0.4, 0.5, 0.6, 1.0). Structural analysis using the neutron Rietveld refinement technique reveals that when x = 0.4 or x 0.4, a small amount of Co progressively enters in the Cu-O plane site as well. The thermoelectric properties of polycrystalline Ba2Ho(Cu3-xCox)O6+y samples were studied in the temperature range of 10K to 390 K. In general, as the cobalt content, x, increases the resistivity of these samples increases while the thermal-conductivity decreases. Among the six Ba2Ho(Cu3-xCox)O6+y compositions, the x=0.4 member gives the highest ZT of 0.018 at approximately 270 K.

Citation

Journal of Applied Physics

Volume

105

Issue

6

Pub Type

Journals

Keywords

Ba2Ho(Cu3-xCox)O6+y, neutron structural study, resistivity, Seebeck coefficient, thermal conductivity, ZT

Citation

Wong-Ng, W. , Yang, Z. , Hu, Y. , Huang, Q. , Lowhorn, N. , Otani, M. , A., J. , Green, M. and Li, Q. (2009), Thermoelectric and Structural Characterization of Ba2Ho(Cu3-xCox)O6+y, Journal of Applied Physics (Accessed October 5, 2024)