Thermoelectric Properties of Ca1-xGdxMnO3-δ (0.00, 0.02, and 0.05) Systems

被引：9

作者：

Bhaskar, Ankam ^{[1
]}

Liu, Chia-Jyi ^{[1
]}

Yuan, J. J. ^{[1
]}

机构：

[1] Natl Changhua Univ Educ, Dept Phys, Changhua 500, Taiwan

来源：

SCIENTIFIC WORLD JOURNAL | 2012年

关键词：

METAL-INSULATOR-TRANSITION; GIANT MAGNETORESISTANCE; THERMOPOWER; PERFORMANCE; TRANSPORT; CAMNO3; STATE;

D O I：

10.1100/2012/149670

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Polycrystalline samples of Ca1-xGdxMnO3-delta (x = 0.00, 0.02, and 0.05) have been studied by X-ray diffraction (XRD), electrical resistivity (rho), thermoelectric power (S), and thermal conductivity (kappa). All the samples were single phase with an orthorhombic structure. The Seebeck coefficient of all the samples was negative, indicating that the predominant carriers are electrons over the entire temperature range. The iodometric titration measurements indicate that the electrical resistivity of Ca1-xGdxMnO3-delta correlated well with the average valence of Mnv+ and oxygen deficiency. Among the doped samples, Ca1-xGdxMnO3-delta had the highest dimensionless figure of merit 0.018 at 300 K, representing an improvement of about 125% with respect to the undoped GaMnO3-delta sample at the same temperature.

引用

页数：5

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