The intermediate phase of strontium chromate aluminate sodalite

Többens, D. M. and Depmeier, W. (2001) The intermediate phase of strontium chromate aluminate sodalite Zeitschrift Fur Kristallographie, 216 (12). pp. 611-615. DOI 10.1524/zkri.216.12.611.22487.

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At high temperatures yellow strontium chromate aluminate sodalite Sr-8[Al12O24](CrO4)(2) has cubic symmetry with orientational disorder of the CrO42- ions within the sodalite cages. The existence of two phase transitions at 299 K and 289 K, which result in superstructures of tetragonal and orthorhombic symmetry, respectively, is well known. The structure of the orthorhombic low-temperature phase has been solved recently [1]. In this work we discuss the crystal structure of the intermediate phase and its determination from neutron and x-ray powder diffraction data. The structure of this phase shows only very small distortions of the framework of AlO4-tetrahedra. The CrO4-tetrahedra within the sodalite cages are partially ordered. The observed distribution of their orientations can be described as a combination of those of the low- and the high-temperature phase. Al-27-MAS-NMR spectra reveal the dynamic nature of the structure.

Document Type: Article
Research affiliation: Kiel University
DOI etc.: 10.1524/zkri.216.12.611.22487
ISSN: 0044-2968
Date Deposited: 02 Feb 2012 07:32
Last Modified: 08 Oct 2012 10:40

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