Temperature dependence of electrical and thermal properties for perovskite-type rare earth cobalt oxide solid solutions Pr1-xTbxCoO3 and their metal-insulator transition behavior

Hideki Hashimoto, Takafumi Kusunose, Tohru Sekino

Research output: Contribution to journalLetterpeer-review

3 Citations (Scopus)

Abstract

We prepared perovskite-type rare earth cobalt oxide solid solutions Pr1-xTbxCoO3 (x = 0, 0.25, 0.5, 0.75, and 1) and investigated their metal-insulator transition behavior from the temperature dependence of electrical conductivity and specific heat. The solid solution exhibited cubic perovskite for x = 0 and 0.25 while orthorhombic phase was observed above 0.5, resulted in the distortion of CoO6 octahedron. The metal-insulator transition temperature of Pr1-xTbxCoO3 determined from both the electrical conductivity and specific heat measurements increased systematically with increasing x values. It is thus considered that the average ionic size of the R-site rare earth elements had an important role on the metal-insulator transition behavior and hence on the electrical properties. These results suggested that the metal-insulator transition temperature could be controlled by the chemical composition of the solid solutions of two type rare earth elements containing cobalt oxides.

Original languageEnglish
Pages (from-to)L3-L6
JournalJournal of Alloys and Compounds
Volume494
Issue number1-2
DOIs
Publication statusPublished - 2010 Apr 2

Keywords

  • Electrical conductivity
  • Ionic size
  • Metal-insulator transition
  • Perovskite
  • Rare earth cobalt oxide
  • Specific heat

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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