High temperature phase transitions in synthetic RbGaSi2O6 and RbFeSi2O6 leucite analogues

BELL, Anthony (2022). High temperature phase transitions in synthetic RbGaSi2O6 and RbFeSi2O6 leucite analogues. In: British Crystallographic Association Spring Meeting, Leeds, UK, 11-14 Apr 2022. British Crystallographic Association. (Unpublished)

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Abstract

High temperature phase transitions in synthetic RbGaSi2O6 and RbFeSi2O6 leucite analogues. A.M.T.Bell (Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield, S1 1WB, UK). Leucite (KAlSi2O6) [1] is a tetrahedrally coordinated silicate framework mineral. Synthetic analogues of leucite can be synthesised with stoichiometries of A+2B2+Si5O12 or A+C3+Si2O6, some of the silicon framework cations partially replaced by divalent (B) or trivalent (C) cations. A monovalent extraframework alkali metal (A) cation is also incorporated in these structures to balance the charges. Ambient temperature structures of synthetic anhydrous leucite analogues (where A = K or Rb and C = Al, Ga or Fe3+) all have I41/a tetragonal structures [1-5] with disordered tetrahedrally coordinated sites (T-sites). On heating these tetragonal leucites can undergo phase transitions to Ia-3d cubic. Phase transitions have been reported for KCSi2O6 [2, 4] and RbAlSi2O6 [4]. Two more I41/a tetragonal to Ia-3d cubic phase transitions are reported after high temperature X-ray powder diffraction studies on RbGaSi2O6 (773K) and RbFeSi2O6 (673K). [1] Mazzi, F., et al. (1976). American Mineralogist, 61, 108-115. [2] Bell, A.M.T. & Henderson, C.M.B. (2020). Journal of Solid State Chemistry, 284, 121142. [3] Bell, A.M.T. & Henderson, C.M.B. (1994). Acta Cryst., C50, 1531-1536. [4] Palmer, D.C., et al. (1997). American Mineralogist, 82, 16-29. [5] Bell, A.M.T. & Stone A.H. (2021). Powder Diffraction, 36(4), 273–281.

Item Type:	Conference or Workshop Item (Poster)
SWORD Depositor:	Symplectic Elements
Depositing User:	Symplectic Elements
Date Deposited:	05 Mar 2024 12:25
Last Modified:	05 Mar 2024 12:30
URI:	https://shura.shu.ac.uk/id/eprint/32985

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