Crystal chemistry, modulated structure, and electrical conductivity in the oxygen excess scheelite-based compounds La1-xThxNbO4+ x 2 and LaNb1-xWxO4+ x 2

R. J. Cava, R. S. Roth, T. Negas, H. S. Parker, D. B. Minor

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

For La1-xThxNbO4+ x 2, three phases with broad homogeneity regions occur, for 0.075 ≤ x ≤ 0.37, 0.41 < x < 0.61, and 0.65 ≤ x ≤ 0.74. All are related to the scheelite structure type, with at least the first exhibiting an incommensurate structural modulation. An analogous structurally modulated phase was found for LaNb1-xWxO4+ x 2 for 0.11 ≤ x ≤ 0.22. Additional phases occur at La0.2Th0.8NbO4.4 and LaNb0.4W0.6O4.3. The electrical conductivity and the direction and wavelength of the structural modulation have been characterized for the La1-xThxNbO4+ x 2 phase with 0.075 ≤ x ≤ 0.37.

Original languageEnglish (US)
Pages (from-to)318-329
Number of pages12
JournalJournal of Solid State Chemistry
Volume40
Issue number3
DOIs
StatePublished - Jan 1 1981
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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