High-temperature semiconducting cubic phase of BiFe0.7Mn0.3O3+δ

Sverre M. Selbach, Thomas Tybell, Mari-Ann Einarsrud, and Tor Grande
Phys. Rev. B 79, 214113 – Published 22 June 2009
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Abstract

BiFe0.7Mn0.3O3+δ with space group R3c is reported to go through two phase transformations, first to the orthorhombic paraelectric phase (Pbnm) and finally to cubic perovskite structure with space group Pm3¯m. A discontinuity in volume and enthalpy shown by thermal analysis revealed that both transitions were first order. Electrical conductivity measurements demonstrated that the material remains semiconducting also in the high-temperature cubic state. The conductivity and the temperature of the two phase transitions were shown to be strongly influenced by the partial pressure of oxygen and a p-type semiconductivity was suggested. Finally, oxygen hyperstoichiometry (δ) of BiFe0.7Mn0.3O3+δ was demonstrated.

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  • Received 3 March 2009

DOI:https://doi.org/10.1103/PhysRevB.79.214113

©2009 American Physical Society

Authors & Affiliations

Sverre M. Selbach1, Thomas Tybell2,3, Mari-Ann Einarsrud1, and Tor Grande1,*

  • 1Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
  • 2Department of Electronics and Telecommunications, Norwegian University of Science and Technology, 7491 Trondheim, Norway
  • 3NTNU NanoLab, Norwegian University of Science and Technology, 7491 Trondheim, Norway

  • *Corresponding author; tor.grande@material.ntnu.no

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Issue

Vol. 79, Iss. 21 — 1 June 2009

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