Effect of dual doping by rare-earth and sodium ions on thermoelectric properties of CaMnO3 ceramics

研究成果: Article査読

抄録

The effects of dual doping by trivalent and monovalent cations on the thermoelectric properties of CaMnO3-δ ceramics were investigated. Na+ was selected as the monovalent cation, while three rare-earth (R) trivalent cations of La3+, Gd3+, and Dy3+ were used to study the role of their size and mass in the electrical and thermal transport properties. Dense ceramic samples with a nominal composition Ca1-x(R1/2Na1/2)xMnO3 (x = 0.1, 0.2, and 0.3) were fabricated via the conventional solid-state reaction route. Due to the partial evaporation of Na during sintering, the electrical conductivity increased and the Seebeck coefficient decreased with the doping level. Additionally, the dual doping by Na and R ions effectively decreased the thermal conductivity. The comparison of the thermoelectric properties of the samples demonstrated that a smaller and heavier R ion is more effective to obtain a high thermoelectric power factor and a low thermal conductivity. As a result, the sample with R = Dy and x = 0.1 possessed a high dimensionless figure-of-merit (ZT) of 0.11 at 1000 K.

本文言語English
ページ(範囲)403-409
ページ数7
ジャーナルJournal of the Ceramic Society of Japan
130
7
DOI
出版ステータスPublished - 2022 7月 1

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 化学 (全般)
  • 凝縮系物理学
  • 材料化学

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