High-temperature transport and defect studies of quadruple perovskites: La2Ba2Cu2Sn2O11, Eu2Ba2Cu2Ti2O11, and La2Ba2Cu2Ti2O11

P. A. Salvador, L. Shen, Thomas O Mason, K. B. Greenwood, Kenneth R Poeppelmeier

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High temperature electrical conductivity and Seebeck coefficient measurements were performed on the quadruple perovskites La2Ba2Cu2Sn2O11, Eu2Ba2Cu2Ti2O11, and La2Ba2Cu2Ti2O11. A transition from n- to p-type semiconductivity is observed for La2Ba2Cu2Sn2O11 as a function of oxygen partial pressure. However, both electrons and holes contribute to the electrical properties over the entire range of experimental conditions. Both Eu2Ba2Cu2Ti2O11 and La2Ba2Cu2Ti2O11 display p-type extrinsic semiconductivity at high oxygen partial pressures and low temperatures. A transition to lightly doped p-type, intrinsic semiconductivity occurs at low oxygen partial pressures and high temperatures. Combined conductivity and thermopower (Jonker) analysis was employed to elucidate the defect structure and the conduction parameters in these compounds. The similarity of these materials to high-Tc cuprates is discussed.

Original languageEnglish
Pages (from-to)80-89
Number of pages10
JournalJournal of Solid State Chemistry
Issue number1
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Condensed Matter Physics

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