Effect of high valence metal doping on thermoelectric properties of [Ca2CoO3-δ]0.62CoO2

被引：0
|
作者：
Fujie, K [1 ]
Horii, S [1 ]
Matsubara, I [1 ]
Shin, W [1 ]
Murayama, N [1 ]
Shimoyama, J [1 ]
Kishio, K [1 ]
机构：
[1] Univ Tokyo, Dept Superconduct, Tokyo 1138656, Japan
来源：
THERMOELECTRIC MATERIALS 2003-RESEARCH AND APPLICATIONS | 2004年 / 793卷
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D O I：
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中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
We report the synthesis and thermoelectric properties of high valence metal-doped [Ca2Co1-xMxO3-delta](0.62)CoO2 (M = Re, Mo or Nb) compounds. Approximately 10% M-doping for Co sites in block layer was found to be effective for dramatic suppression of oxygen nonstoichiometries. Seebeck coefficients were systematically enhanced with M-doping levels (x), and however, electrical resistivities also increased with x for conventionally sintered bulk samples. On the other hand, magnetic alignment and/or densification were remarkably effective for reduction of the resistivity. In the case of Mo-doped (x = 0.1) sample, a highly c-axis aligned and densified sample showed 1-3 times larger power factor at 1100 K (5.3 muWK(-2)cm(-1)) than the non-doped one. Moreover, these high valence metal doped Ca349 compounds exhibited the oxygen nonstoichiometry suppressed dramatically.
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页码：317 / 322
页数：6
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