Structural effect of aliovalent doping in lead perovskites

Kevin R. Tolman, Rick Ubic, Meagan Papac, Kevin C. Seymour, Scott J. McCormack, Waltraud M. Kriven, Hans Kungl

Research output: Contribution to journalArticlepeer-review

Abstract

Composition-structure relationships are needed for various applications, including lattice-matching for heteroepitaxy; however, a general model to predict lattice constants in defective perovskites is not yet available because the exact nature of A-site vacancies in perovskites remains largely unknown. In this study, it has been shown experimentally via Le Bail refinements of x-ray diffraction data that such vacancies in (Pb1-3xLa2xx)TiO3 and (Pb1-3xLa2xx)(Zr0.6Ti0.4)O3 have an effective size due to both Coulombic repulsion of coordinating oxygen ions and bond relaxation. For the first time, cell volume can be predicted in this system from stoichiometry and published ionic radii data alone to within 0.2% accuracy within 0≤x≤13 compositional range and <0.3% accuracy all the way to x=13. The model may be applied to other perovskite systems and eventually provide tailored properties (magnetic, dielectric, and other) based on improved structure predictions.

Original languageEnglish (US)
Pages (from-to)359-367
Number of pages9
JournalJournal of Solid State Chemistry
Volume225
DOIs
StatePublished - May 2015

Keywords

  • PLZT
  • Perovskites
  • Point defects
  • Synchrotron radiation
  • Transmission electron microscopy (TEM)
  • X-Ray diffraction (XRD)

ASJC Scopus subject areas

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

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