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Bond lengths and valences in aluminates with the magnetoplumbite and β-alumina structures

Authors
Journal
Journal of Solid State Chemistry
0022-4596
Publisher
Elsevier
Publication Date
Volume
73
Issue
1
Identifiers
DOI: 10.1016/0022-4596(88)90071-0

Abstract

Abstract Bond valence sums in a number of compounds with the β-alumina and magnetoplumbite structures show that the tetrahedral Al atom in the center of the “spinel slabs” is consistently underbonded (i.e., the AlO bonds are longer than normal). Except for bonds to this atom, predicted bond lengths agree well with those observed. Refinements of X-ray data for CaAl 12O 19 and SrAl 12O 19 show that the “anomalous” tetrahedral site is fully occupied and indicates normal temperature factors for the atom at this site. It is proposed that the long AlO bonds are a result of Al … Al nonbonded interactions in accord with previous ideas.

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