Polymorphism, structures and phase transformation of K3[SO4]F

Janet M.S. Skakle*, James G. Fletcher, Anthony R. West

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The phase K3[SO4]F was found to be dimorphic, undergoing a reversible tetragonal (β) to cubic (α) phase transition at 585°C. The room-temperature polymorph, β-K3[SO4]F, is isostructural with Ba3SiO5, as confirmed by Rietveld refinement of X-ray powder diffraction data: a = 7.2961(5), c = 10.854(1) Å, R = 0.0689 and Rwp = 0.0907. The α form is cubic, a ≈ 5.43 Å, with probable space group Pm3m. Partial Rietveld refinement suggested that it has an anti-perovskite structure. Lattice parameter measurements as a function of temperature showed no discontinuity at the α-β transition, which is therefore suggested to be a displacive second-order transition.

Original languageEnglish
Pages (from-to)2497-2501
Number of pages5
JournalJournal of the Chemical Society - Dalton Transactions
Issue number12
Publication statusPublished - 21 Jun 1996


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