Crystal chemistry of (RE,A)2M3O7 compounds (RE = Y, lanthanide; A = Ba, Sr, Ca; M = Al, Ga)

J. M.S. Skakle*, R. Herd

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Phases of general formula (REA)2M3O7 (RE = lanthanide, A = Ca, Sr, Ba; M = Ga, Al) are of interest for their nonlinear optical properties and have potential as solid state lasers. Their structures have been refined using X-ray and neutron diffraction data and are related to gehlenite, Ca2Al2SiO7, with M cations occupying Al and Si sites and RE and A cations sharing the Ca site with no evidence for ordering, although they occur in the ratio 1 : 1 because of stoichiometry; the M cations are tetrahedrally coordinated. (RE,Ba)2M3O7 compounds cannot be synthesized for M = Al or for RE cations smaller than Sm; this limitation is believed to be due to size mismatch between cations within the structure.

Original languageEnglish
Pages (from-to)195-202
Number of pages8
JournalPowder Diffraction
Issue number3
Publication statusPublished - 30 Sep 1999


  • Gehlenite
  • Neutron diffraction
  • Optical materials
  • Rare earths
  • Rietveld refinement


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