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Electrical transport and thermoelectric properties of Ca 0.8 Y 0.2− x Dy x MnO 3−δ (0 ≤ x ≤ 0.2)
Author(s) -
Seo Jang Woo,
Cha Jaesung,
Won Sung Ok,
Park Kyeongsoon
Publication year - 2017
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/jace.14898
Subject(s) - seebeck coefficient , thermoelectric effect , electrical resistivity and conductivity , analytical chemistry (journal) , dimensionless quantity , materials science , thermal conductivity , thermoelectric materials , mineralogy , chemistry , thermodynamics , physics , chromatography , quantum mechanics , composite material
Ca 0.8 Y 0.2− x Dy x MnO 3−δ (0≤ x ≤0.2) samples were fabricated by the solid‐state reaction method, and their thermoelectric properties were studied from 500°C to 800°C. Upon the substitution of Dy 3+ for Y 3+ in the Ca 0.8 Y 0.2− x Dy x MnO 3−δ , the electrical and thermal conductivities gradually decreased with increasing Dy 3+ concentration, whereas the absolute value of the Seebeck coefficient significantly increased. The Ca 0.8 Dy 0.2 MnO 3−δ showed the largest value of dimensionless figure of merit (0.180) at 800°C as a result of the combination of the largest absolute value of the Seebeck coefficient and the lowest thermal conductivity. We believe that the Ca 0.8 Dy 0.2 MnO 3−δ is a promising thermoelectric material at high temperatures.