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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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