Take a sneak peek at the new NIST.gov and let us know what you think!
(Please note: some content may not be complete on the beta site.).
NIST Authors in Bold
|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;|
|Title:||Thermoelectric and Structural Characterization of Ba2Ho(Cu3-xCox)O6+y|
|Published:||June 13, 2009|
|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, Co mainly substitutes for Cu in the Cu-O chain site (basal plane) of the Ba2Ho(Cu3-xCox)O6+y structure. As 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|
|Keywords:||Ba2Ho(Cu3-xCox)O6+y,neutron structural study,resistivity,Seebeck coefficient,thermal conductivity,ZT|
|Research Areas:||Ceramics, Characterization, Energy, Energy Conversion, Storage, and Transport|