Title of article
Improving the spin entropy by suppressing Co4+ concentration in thermoelectric Ca3Co4O9+δ
Author/Authors
Guodong Tang، نويسنده , , Feng Xu، نويسنده , , Dewei Zhang، نويسنده , , Zhihe Wang، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2013
Pages
4
From page
1341
To page
1344
Abstract
We report the effects of rare earth Gd doping on the spin entropy in Ca3Co4O9+δ. Magnetothermopower is found to be strongly magnetic-field dependent and increases upon Gd doping, revealing that Gd doping can improve the spin entropy of Ca3Co4O9+δ. X-ray photoemission spectroscopy (XPS) results allow us to determine the decrease in Co4+ concentration induced by Gd doping. Our results confirm that the spin-entropy enhancement originates from the decrease of Co4+ concentration. The present study suggests that we can improve the spin entropy by suppressing Co4+ concentration in layered cobalt oxides.
Keywords
C. Thermal properties , layered cobalt oxide , Thermoelectric properties
Journal title
Ceramics International
Serial Year
2013
Journal title
Ceramics International
Record number
1277242
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