Synthesis and thermoelectric properties of Yb-doped Ca0.9-x Yb x La0.1MnO3 ceramics

Bo Zhang; Aimin Chang; Qing Zhao; Haitao Ye; Yiquan Wu

doi:10.1007/s11664-014-3326-8

Synthesis and thermoelectric properties of Yb-doped Ca_0.9-x Yb _x La_0.1MnO₃ ceramics

Bo Zhang, Aimin Chang^*, Qing Zhao, Haitao Ye, Yiquan Wu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The microstructure and thermoelectric properties of Yb-doped Ca_0.9-x Yb _x La_0.1 MnO₃ (0 ≤ x ≤ 0.05) ceramics prepared by using the Pechini method derived powders have been investigated. X-ray diffraction analysis has shown that all samples exhibit single phase with orthorhombic perovskite structure. All ceramic samples possess high relative densities, ranging from 97.04% to 98.65%. The Seebeck coefficient is negative, indicating n-type conduction in all samples. The substitution of Yb for Ca leads to a marked decrease in the electrical resistivity, along with a moderate decrease in the absolute value of the Seebeck coefficient. The highest power factor is obtained for the sample with x = 0.05. The electrical conduction in these compounds is due to electrons hopping between Mn³⁺ and Mn⁴⁺, which is enhanced by increasing Yb content.

Original language	English
Pages (from-to)	4048-4055
Number of pages	8
Journal	Journal of Electronic Materials
Volume	43
Issue number	11
Early online date	19 Aug 2014
DOIs	https://doi.org/10.1007/s11664-014-3326-8
Publication status	Published - 30 Nov 2014

Keywords

electrical conduction
manganites
Pechini method
power factor

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10.1007/s11664-014-3326-8

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title = "Synthesis and thermoelectric properties of Yb-doped Ca0.9-x Yb x La0.1MnO3 ceramics",

abstract = "The microstructure and thermoelectric properties of Yb-doped Ca0.9-x Yb x La0.1 MnO3 (0 ≤ x ≤ 0.05) ceramics prepared by using the Pechini method derived powders have been investigated. X-ray diffraction analysis has shown that all samples exhibit single phase with orthorhombic perovskite structure. All ceramic samples possess high relative densities, ranging from 97.04% to 98.65%. The Seebeck coefficient is negative, indicating n-type conduction in all samples. The substitution of Yb for Ca leads to a marked decrease in the electrical resistivity, along with a moderate decrease in the absolute value of the Seebeck coefficient. The highest power factor is obtained for the sample with x = 0.05. The electrical conduction in these compounds is due to electrons hopping between Mn3+ and Mn4+, which is enhanced by increasing Yb content.",

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AU - Zhang, Bo

AU - Chang, Aimin

AU - Zhao, Qing

AU - Ye, Haitao

AU - Wu, Yiquan

PY - 2014/11/30

Y1 - 2014/11/30

N2 - The microstructure and thermoelectric properties of Yb-doped Ca0.9-x Yb x La0.1 MnO3 (0 ≤ x ≤ 0.05) ceramics prepared by using the Pechini method derived powders have been investigated. X-ray diffraction analysis has shown that all samples exhibit single phase with orthorhombic perovskite structure. All ceramic samples possess high relative densities, ranging from 97.04% to 98.65%. The Seebeck coefficient is negative, indicating n-type conduction in all samples. The substitution of Yb for Ca leads to a marked decrease in the electrical resistivity, along with a moderate decrease in the absolute value of the Seebeck coefficient. The highest power factor is obtained for the sample with x = 0.05. The electrical conduction in these compounds is due to electrons hopping between Mn3+ and Mn4+, which is enhanced by increasing Yb content.

AB - The microstructure and thermoelectric properties of Yb-doped Ca0.9-x Yb x La0.1 MnO3 (0 ≤ x ≤ 0.05) ceramics prepared by using the Pechini method derived powders have been investigated. X-ray diffraction analysis has shown that all samples exhibit single phase with orthorhombic perovskite structure. All ceramic samples possess high relative densities, ranging from 97.04% to 98.65%. The Seebeck coefficient is negative, indicating n-type conduction in all samples. The substitution of Yb for Ca leads to a marked decrease in the electrical resistivity, along with a moderate decrease in the absolute value of the Seebeck coefficient. The highest power factor is obtained for the sample with x = 0.05. The electrical conduction in these compounds is due to electrons hopping between Mn3+ and Mn4+, which is enhanced by increasing Yb content.

KW - electrical conduction

KW - manganites

KW - Pechini method

KW - power factor

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Synthesis and thermoelectric properties of Yb-doped Ca_0.9-x Yb _x La_0.1MnO₃ ceramics

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Keywords

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