Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/9978
Title: Transitions between P21, P63 (√ 3A), and P6322 modifications of SrAl2O4 by in situ high-temperature x-ray and neutron diffraction
Authors: Avdeev, M
Yakovlev, S
Yaremchenko, AA
Kharton, VV
Keywords: Phase transformations
Neutron diffraction
X-ray diffraction
Crystal structure
Symmetry
Oxygen
Issue Date: 1-Dec-2007
Publisher: Elsevier
Citation: Avdeev, M., Yakovlev, S., Yaremchenko, A. A., & Kharton, V. V. (2007). Transitions between P21, P63 (√ 3A), and P6322 modifications of SrAl2O4 by in situ high-temperature x-ray and neutron diffraction. Journal of Solid State Chemistry, 180(12), 3535-3544, doi:10.1016/j.jssc.2007.10.021
Abstract: The results of in situ high-temperature X-ray and neutron powder diffraction experiments reconcile inconsistencies in previous reports on the symmetry of high-temperature phases of SrAl2O4. The material undergoes two reversible phase transitions P21↔P63(3A) and P63(3A)↔P6322 at ∼680 and ∼860°C, respectively, and the latter one is experimentally observed and characterized for the first time. The higher symmetry above the P63(3A)↔P6322 transition is gained by disordering off-center split site of oxygen atoms around trigonal axis rather than by unbending Al–O–Al angle to the ideal value 180°. The analysis of the literature suggests that it is a common feature of the P6322 phases of stuffed tridymites.© 2007 Elsevier Inc.
URI: https://doi.org/10.1016/j.jssc.2007.10.021
https://apo.ansto.gov.au/dspace/handle/10238/9978
ISSN: 0022-4596
Appears in Collections:Journal Articles

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