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Two-dimensional periodic antiphase boundaries in a synthetic aluminate sodalite, Ca (sub 8) [Al (sub 12) O (sub 24) ](CrO (sub 4) ) (sub 2)

Ishmael Hassan
Two-dimensional periodic antiphase boundaries in a synthetic aluminate sodalite, Ca (sub 8) [Al (sub 12) O (sub 24) ](CrO (sub 4) ) (sub 2)
The Canadian Mineralogist (October 1996) 34, Part 5: 1031-1038

Abstract

Transmission electron microscopy (TEM) has provided direct evidence for ordering of [Ca (sub 4) .CrO (sub 4) ] (super 6+) clusters in a synthetic aluminate sodalite, Ca (sub 8) [Al (sub 12) O (sub 24) ](CrO (sub 4) ) (sub 2) . The ordering of the above clusters causes antiphase domains that are separated by two-dimensional periodic antiphase boundaries (APBs). Such APBs are rare in minerals and inorganic solids, but they do occur in alloys. The APBs are at 90 degrees to each other, parallel to {110} planes, and separated by about 54 Aa. At high temperature, the [Ca (sub 4) .CrO (sub 4) ] (super 6+) clusters in the aluminate sodalite (space group I43 m) are disordered, together with the framework oxygen atoms. As the temperature is lowered, the [Ca (sub 4) .CrO (sub 4) ] (super 6+) clusters are ordered and cause two-dimensional periodic APBs that are probably accompanied by positional modulations of the framework oxygen atoms.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 34, Part 5
Title: Two-dimensional periodic antiphase boundaries in a synthetic aluminate sodalite, Ca (sub 8) [Al (sub 12) O (sub 24) ](CrO (sub 4) ) (sub 2)
Author(s): Hassan, Ishmael
Affiliation: University of Kuwait, Department of Geology, Safat, Kuwait
Pages: 1031-1038
Published: 199610
Text Language: English
Summary Language: French
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 17
Accession Number: 2001-034637
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200111
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