Principles and Applications of Anion Order in Solid Oxynitrides

J. Paul Attfield*

*Corresponding author for this work

Research output: Contribution to journalLiterature reviewpeer-review

Abstract / Description of output

Metal oxynitrides are emerging materials that may combine the advantages of oxides and nitrides. Anion order is important for controlling and tuning properties, and neutron diffraction provides good O/N contrast for experimental determinations of local or long-range O/N order in solids. Differences between oxide and nitride in charge, size, and covalent bonding are the important factors that drive anion order. An important example is the robust partial anion order in SrMO2N (M Nb, Ta) and related oxynitride perovskites driven by covalency that results in disordered zigzag MN chains which segregate into planes within the perovskite lattice. This leads to unusual subextensive scaling of entropy, described as "open order". Local anion order is important to optical materials Size mismatch between host and dopant cations leads to local O/N clustering that tunes photoluminescence shifts systematically in M1.95Eu0.05Si5-xAlxN8-xOx phosphors, leading to a red shift when the M = Ba and Sr host cations are larger than the Eu2+ dopant but a blue shift when the M = Ca host is smaller.

Original languageEnglish
Pages (from-to)4623-4629
Number of pages7
JournalCrystal Growth and Design
Volume13
Issue number10
DOIs
Publication statusPublished - 2 Oct 2013

Keywords / Materials (for Non-textual outputs)

  • POWDER DIFFRACTION
  • CRYSTAL-STRUCTURE
  • PEROVSKITES
  • NEUTRON
  • PHOSPHORS
  • SR
  • BA
  • CA
  • PHOTOCATALYST
  • SRTAO2N

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