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

Published online by Cambridge University Press:  10 January 2013

J. M. S. Skakle  and
R. Herd
J. M. S. Skakle
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, United Kingdom
R. Herd
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, United Kingdom
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Abstract

Phases of general formula (RE, A)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.

Keywords

Rietveld refinementoptical materialsrare earthsgehleniteneutron diffraction
Type
Research Article
Information
Powder Diffraction , Volume 14 , Issue 3 , September 1999 , pp. 195 - 202
Copyright
Copyright © Cambridge University Press 1999

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