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High‐Temperature Thermoelectric Properties in the La 2− x R x CuO 4 (R: Pr, Y, Nb) Ceramics
Author(s) -
Liu Yong,
Lin YuanHua,
Zhang BoPing,
Zhu HongMin,
Nan CeWen,
Lan Jinle,
Li JingFeng
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.02952.x
Subject(s) - spark plasma sintering , materials science , thermoelectric effect , seebeck coefficient , ceramic , crystallite , impurity , thermoelectric materials , microstructure , sintering , analytical chemistry (journal) , condensed matter physics , metallurgy , thermodynamics , chemistry , physics , organic chemistry , chromatography
La 2 − x R x CuO 4 (R: Pr, Y, Nb) polycrystalline ceramics have been prepared by a spark plasma sintering process. Analysis of the microstructure and phase composition shows that pure La 2 CuO 4 ceramics with a high density can be obtained, and no impurity phases appear. All the samples exhibit a metal–semiconductor transition behavior at ∼750 K, which could be ascribed to the decreasing charge density as a result of loss of oxygen atoms and various conduction mechanisms in these La 2 CuO 4 ‐based ceramics. Our results indicate that the La 1.98 Y 0.02 CuO 4 ceramics show large thermoelectric power ∼1.0 × 10 −3 μW·(m·K 2 ) −1 , and the evaluated ZT can reach 0.17 at 330 K, which potentially make them useful for thermoelectric applications.