Abstract
The paraelastic phase of lead aluminium fluoride, Pb 5 Al 3 F 19 , forms above a transition temperature of about 360K. The structure contains corner-sharing chains of AlF 6 octahedra, individual AlF 6 octahedra, individual F- ions and Pb 2+ ions. Both sets of independent AlF 6 octahedra are slightly distorted, with Al-F distances of 1.79(3) and 1.80(2)A. The transition from the ferroelastic phase is weakly first order [Ravez, Andriamampianina, Simon, Rabardel, Ihringer & Abrahams (1994). J. Appl. Cryst. 27, 362-368].
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Schedule a callMore From: Acta crystallographica. Section C, Crystal structure communications
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