期刊
CERAMICS INTERNATIONAL
卷 40, 期 7, 页码 10545-10550出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.03.030
关键词
Re and Pt doping; Transport mechanism; Carrier concentration; Electronic correlation
资金
- National Key Basic Research [2011CBA00111]
- National Natural Science Foundation of China [11174293, U1232140, 10904151]
The effect of Re and Pt doping on the structural, electrical and thermal transport properties of Ca3Co4-xMxO9 (0 <= x <= 0.2, M=Re and Pt) samples have been investigated systematically. As Re7+ or Pt4+ ions are doped into Ca3Co4O9 lattice, the resistivity and the metal-insulator-transition temperature increase monotonously with increasing x, indicating that both Re- and Pt-substitution can result in more stable spin-density-wave state. For Re-doped samples, the thermopower increases with increasing x, while the thermopower of Pt-doped samples decreases monotonously. Although the decreased thermal conductivity of both Re- and Pt-doped samples is beneficial to the thermoelectric performance, their ZT value decreases with increasing x. The result shows that both Re and Pt doping may indeed exert a significant influence in the structural and transport properties of Ca3Co4O9 system, which are suggested to originate from the variations of carrier concentration and electronic correlation induced by Re or Pt doping. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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