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Large thermal conductivity reduction induced by La/O vacancies in the thermoelectric LaCoO3 system

A series of compact La/O-vacant La(1-x)CoO(3-y) compounds were prepared by a cold high-pressure procedure, and their thermoelectric (TE) properties were investigated. Compared with the ion-substituted hole-type LaCoO(3) systems (e.g., La(1-x)Sr(x)CoO(3)), the thermal conduction of La(1-x)CoO(3-y) is... Full description

Journal Title: Inorganic chemistry 16 May 2011, Vol.50(10), pp.4412-6
Main Author: Wang, Yang
Other Authors: Li, Fang , Xu, Luxiang , Sui, Yu , Wang, Xianjie , Su, Wenhui , Liu, Xiaoyang
Format: Electronic Article Electronic Article
Language: English
ID: E-ISSN: 1520-510X ; PMID: 21488667 Version:1 ; DOI: 10.1021/ic200178x
Link: http://pubmed.gov/21488667
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title: Large thermal conductivity reduction induced by La/O vacancies in the thermoelectric LaCoO3 system
format: Article
creator:
  • Wang, Yang
  • Li, Fang
  • Xu, Luxiang
  • Sui, Yu
  • Wang, Xianjie
  • Su, Wenhui
  • Liu, Xiaoyang
ispartof: Inorganic chemistry, 16 May 2011, Vol.50(10), pp.4412-6
description: A series of compact La/O-vacant La(1-x)CoO(3-y) compounds were prepared by a cold high-pressure procedure, and their thermoelectric (TE) properties were investigated. Compared with the ion-substituted hole-type LaCoO(3) systems (e.g., La(1-x)Sr(x)CoO(3)), the thermal conduction of La(1-x)CoO(3-y) is noticeably reduced by the La/O vacancies, whereas the electric transport is less influenced, which results in an efficient ZT enhancement. We demonstrate that the large thermal conductivity reduction originates from the strong point-defect scattering, and La(1-x)CoO(3-y) can be rationalized as a partially filled solid solution: La(1-x)◻(x)CoO(3-y)◻(y), where ◻ denotes a vacancy. Such intrinsic thermal conductivity suppression provides an effective pathway for the design of better TE materials.
language: eng
source:
identifier: E-ISSN: 1520-510X ; PMID: 21488667 Version:1 ; DOI: 10.1021/ic200178x
fulltext: fulltext
issn:
  • 1520510X
  • 1520-510X
url: Link


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titleLarge thermal conductivity reduction induced by La/O vacancies in the thermoelectric LaCoO3 system
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descriptionA series of compact La/O-vacant La(1-x)CoO(3-y) compounds were prepared by a cold high-pressure procedure, and their thermoelectric (TE) properties were investigated. Compared with the ion-substituted hole-type LaCoO(3) systems (e.g., La(1-x)Sr(x)CoO(3)), the thermal conduction of La(1-x)CoO(3-y) is noticeably reduced by the La/O vacancies, whereas the electric transport is less influenced, which results in an efficient ZT enhancement. We demonstrate that the large thermal conductivity reduction originates from the strong point-defect scattering, and La(1-x)CoO(3-y) can be rationalized as a partially filled solid solution: La(1-x)◻(x)CoO(3-y)◻(y), where ◻ denotes a vacancy. Such intrinsic thermal conductivity suppression provides an effective pathway for the design of better TE materials.
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titleLarge thermal conductivity reduction induced by La/O vacancies in the thermoelectric LaCoO3 system
descriptionA series of compact La/O-vacant La(1-x)CoO(3-y) compounds were prepared by a cold high-pressure procedure, and their thermoelectric (TE) properties were investigated. Compared with the ion-substituted hole-type LaCoO(3) systems (e.g., La(1-x)Sr(x)CoO(3)), the thermal conduction of La(1-x)CoO(3-y) is noticeably reduced by the La/O vacancies, whereas the electric transport is less influenced, which results in an efficient ZT enhancement. We demonstrate that the large thermal conductivity reduction originates from the strong point-defect scattering, and La(1-x)CoO(3-y) can be rationalized as a partially filled solid solution: La(1-x)◻(x)CoO(3-y)◻(y), where ◻ denotes a vacancy. Such intrinsic thermal conductivity suppression provides an effective pathway for the design of better TE materials.
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abstractA series of compact La/O-vacant La(1-x)CoO(3-y) compounds were prepared by a cold high-pressure procedure, and their thermoelectric (TE) properties were investigated. Compared with the ion-substituted hole-type LaCoO(3) systems (e.g., La(1-x)Sr(x)CoO(3)), the thermal conduction of La(1-x)CoO(3-y) is noticeably reduced by the La/O vacancies, whereas the electric transport is less influenced, which results in an efficient ZT enhancement. We demonstrate that the large thermal conductivity reduction originates from the strong point-defect scattering, and La(1-x)CoO(3-y) can be rationalized as a partially filled solid solution: La(1-x)◻(x)CoO(3-y)◻(y), where ◻ denotes a vacancy. Such intrinsic thermal conductivity suppression provides an effective pathway for the design of better TE materials.
doi10.1021/ic200178x
pmid21488667
date2011-05-16