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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, SO
Yaremchenko, AA
Kharton, VV
Keywords: Phase Transformations
Neutron Diffraction
X-Ray Diffraction
Temperature Range
Issue Date: Dec-2007
Publisher: Elsevier
Citation: Avdeev, M., YakovIev, S., Yaremchenko, A. A., & Kharton, V. V. (2007). Transitions between P2¹, P6³(√3A), and P6³2 modifications of SrAl²O4 by in situ high-temperature X-ray and neutron diffraction. Journal of Solid State Chemistry, 180(12), 3535-3544.
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 P2(1) <-> P6(3)(√3A) and P6(3)(√3A) <-> P6(3)22 at similar to 680 and similar to 860°C, respectively, and the latter one is experimentally observed and characterized for the first time. The higher symmetry above the P6(3)(√3A) <-> P6(3)22 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°C. The analysis of the literature suggests that it is a common feature of the P6(3)22 phases of stuffed tridymites. © 2007, Elsevier Ltd.
ISSN: 0022-4596
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