Correlation between the structural distortions and thermoelectric characteristics in La-xAxCoO3 (A = Ca and Sr)

Yang Wang; Yu Sui; Peng Ren; Lan Wang; Xianjie Wang; Wenhui Su; Hong Jin Fan

doi:10.1021/ic902072v

Correlation between the structural distortions and thermoelectric characteristics in La_-xA_xCoO₃ (A = Ca and Sr)

Yang Wang, Yu Sui, Peng Ren, Lan Wang, Xianjie Wang, Wenhui Su, Hong Jin Fan

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

99 Citations (Scopus)

Abstract

Detailed structures and thermoelectric (TE) properties are Investigated for the perovskite La_1-xCa_xCoO₃ and La _1-xSr_xCoO₃ with O ≤ × ≤ 0.3. The monoclinic crystal structures for all samples are refined from powder X-ray diffraction, which reveals that the La_1-xCa_xCoO ₃ series has smaller global distortions but larger local distortions. The different structural distortions strongly Influence the transport and TE properties in terms of resistivity, thermopower, thermal conductivity, bandwidth, and effective mass as well as electronic correlation. These results unambiguously demonstrate a close correlation between the structural distortions and TE characteristics In this family. Furthermore, a new approach is suggested to improve the TE performance by controlling the structure factors in such strongly correlated oxide systems. The effects of the spin-state transition of Co ions on the TE properties are also discussed.

Original language	English
Pages (from-to)	3216-3223
Number of pages	8
Journal	Inorganic Chemistry
Volume	49
Issue number	7
DOIs	https://doi.org/10.1021/ic902072v
Publication status	Published - Apr 5 2010
Externally published	Yes

ASJC Scopus Subject Areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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10.1021/ic902072v

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abstract = "Detailed structures and thermoelectric (TE) properties are Investigated for the perovskite La1-xCaxCoO3 and La 1-xSrxCoO3 with O ≤ × ≤ 0.3. The monoclinic crystal structures for all samples are refined from powder X-ray diffraction, which reveals that the La1-xCaxCoO 3 series has smaller global distortions but larger local distortions. The different structural distortions strongly Influence the transport and TE properties in terms of resistivity, thermopower, thermal conductivity, bandwidth, and effective mass as well as electronic correlation. These results unambiguously demonstrate a close correlation between the structural distortions and TE characteristics In this family. Furthermore, a new approach is suggested to improve the TE performance by controlling the structure factors in such strongly correlated oxide systems. The effects of the spin-state transition of Co ions on the TE properties are also discussed.",

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T1 - Correlation between the structural distortions and thermoelectric characteristics in La-xAxCoO3 (A = Ca and Sr)

AU - Wang, Yang

AU - Sui, Yu

AU - Ren, Peng

AU - Wang, Lan

AU - Wang, Xianjie

AU - Su, Wenhui

AU - Fan, Hong Jin

PY - 2010/4/5

Y1 - 2010/4/5

N2 - Detailed structures and thermoelectric (TE) properties are Investigated for the perovskite La1-xCaxCoO3 and La 1-xSrxCoO3 with O ≤ × ≤ 0.3. The monoclinic crystal structures for all samples are refined from powder X-ray diffraction, which reveals that the La1-xCaxCoO 3 series has smaller global distortions but larger local distortions. The different structural distortions strongly Influence the transport and TE properties in terms of resistivity, thermopower, thermal conductivity, bandwidth, and effective mass as well as electronic correlation. These results unambiguously demonstrate a close correlation between the structural distortions and TE characteristics In this family. Furthermore, a new approach is suggested to improve the TE performance by controlling the structure factors in such strongly correlated oxide systems. The effects of the spin-state transition of Co ions on the TE properties are also discussed.

AB - Detailed structures and thermoelectric (TE) properties are Investigated for the perovskite La1-xCaxCoO3 and La 1-xSrxCoO3 with O ≤ × ≤ 0.3. The monoclinic crystal structures for all samples are refined from powder X-ray diffraction, which reveals that the La1-xCaxCoO 3 series has smaller global distortions but larger local distortions. The different structural distortions strongly Influence the transport and TE properties in terms of resistivity, thermopower, thermal conductivity, bandwidth, and effective mass as well as electronic correlation. These results unambiguously demonstrate a close correlation between the structural distortions and TE characteristics In this family. Furthermore, a new approach is suggested to improve the TE performance by controlling the structure factors in such strongly correlated oxide systems. The effects of the spin-state transition of Co ions on the TE properties are also discussed.

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Correlation between the structural distortions and thermoelectric characteristics in La_-xA_xCoO₃ (A = Ca and Sr)

Abstract

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