Phases of Anionic Ordering in Elpasolite Structures (Ordered Perovskites

Roman G. Sevryukov, Ivan N. Safonov, Maksim S. Molokeev, Sergey V. Misyul
2016 Journal of Siberian Federal University Mathematics & Physics  
The 108 dissymmetric phases were obtained as a result of X anions ordering in elpasolite structure A2BB ′ X6 (ordered perovskite) using group theoretical methods. The critical order parameters which transform according to the irreducible representations of Γ and X points of Brillouin zone of O 5 h -F m3m space group were considered only. Polyhedral structures showed for dissymmetric phases which are accompanied by appearing of ferroelectricity at phase transition. All results are summarized in convenient tables.
doi:10.17516/1997-1397-2016-9-1-108-118 fatcat:wf2rxrqwsbgobagomvftgwv2oi