| 摘要 | 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)square(x)CoO(3-y)square(y), where square denotes a vacancy. Such intrinsic thermal conductivity suppression provides an effective pathway for the design of better TE materials. |
| 部门归属 | [wang, yang; sui, yu; wang, xianjie; su, wenhui] harbin inst technol, dept phys, ctr condensed matter sci & technol ccmst, harbin 150001, peoples r china. [wang, yang] nanyang technol univ, sch phys & math sci, div phys & appl phys, singapore 637371, singapore. [li, fang] sw petr univ, sch petr engn, chengdu 610500, peoples r china. [xu, luxiang] sichuan normal univ, lab low dimens struct phys, inst solid state phys, chengdu 610068, peoples r china. [xu, luxiang] sichuan normal univ, sch phys & elect engn, chengdu 610068, peoples r china. [sui, yu] acad sinica, int ctr mat phys, shenyang 110015, peoples r china. [liu, xiaoyang] jilin univ, coll chem, state key lab inorgan synth & preparat chem, changchun 130012, peoples r china.;wang, y (reprint author), harbin inst technol, dept phys, ctr condensed matter sci & technol ccmst, harbin 150001, peoples r china;wang_yang@ntu.edu.sg suiyu@hit.edu.cn
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| APA |
Y. Wang.,F. Li.,L. X. Xu.,Y. Sui.,X. J. Wang.,...&X. Y. Liu.(2011).Large Thermal Conductivity Reduction Induced by La/O Vacancies in the Thermoelectric LaCoO(3) System.Inorganic Chemistry,50(10),4412-4416.
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