Long- and short-range order in stuffed titanate pyrochlores

G. C. Lau, T. M. McQueen, Q. Huang, H. W. Zandbergen, R. J. Cava

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

We report a structural study of the stuffed pyrochlore series Ln2(Ti2-xLnx)O7-x/2 (Ln=Ho, Yb; 0≤x≤0.67). Electron microscopy and Rietveld refinements of neutron powder diffraction data for the x=0.67 end members, Ho2TiO5 and Yb2TiO5, reveal that small domains (∼50 Å or less) exist where the Ln and Ti/Ln sublattices are pyrochlore like, while the average structure is fluorite like. Both the Ho and Yb stuffed pyrochlore series for 0.1≤x≤0.5 are shown to be a composite of long- and short-range-ordered pyrochlore phases. The relative fraction of long-range vs. short-range pyrochlore order decreases with increasing Ln doping. An additional complex structural modulation of the pyrochlore structure is observed in electron diffraction and high-resolution electron microscopy images.

Original languageEnglish (US)
Pages (from-to)45-50
Number of pages6
JournalJournal of Solid State Chemistry
Volume181
Issue number1
DOIs
StatePublished - Jan 1 2008

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

Keywords

  • Geometrically frustrated magnet
  • Pyrochlore
  • Pyrochlore to fluorite solid solution
  • Rare-earth titanate
  • Stuffed pyrochlore
  • Stuffed spin ice

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