Ordering and twinning in the nonstoichiometric phase La1 − y Ca y F3 − y

The nonstoichiometric phase La1 - y Ca y F3 - y with a LaF3-related structure has been studied by electron diffraction. In addition to diffraction features corresponding to twinning on the (001) and {1{expression}0} planes, typical of LaF3, evidence has been found for twinning on the {101} and {102}...

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Bibliographic Details
Published in:Inorganic materials 2008-08, Vol.44 (8), p.894-899
Main Authors: Maksimov, S. K., Maksimov, K. S.
Format: Article
Language:English
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Summary:The nonstoichiometric phase La1 - y Ca y F3 - y with a LaF3-related structure has been studied by electron diffraction. In addition to diffraction features corresponding to twinning on the (001) and {1{expression}0} planes, typical of LaF3, evidence has been found for twinning on the {101} and {102} planes. This behavior is accounted for by the formation of ordering domains with an ordering direction inclined to mirror planes. It seems likely that ordering domains determine many of the properties of nonstoichiometric phases.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168508080219