PARAELASTIC PB5AL3F19 AT 370 K

Authors
SARRAUTE S RAVEZ J BRAVIC G CHASSEAU D ABRAHAMS SC
Citation
S. Sarraute et al., PARAELASTIC PB5AL3F19 AT 370 K, Acta crystallographica. Section C, Crystal structure communications, 51, 1995, pp. 1731-1732
Citations number
6
Categorie Soggetti
Crystallography
Journal title
Acta crystallographica. Section C, Crystal structure communications → ACNP
ISSN journal
01082701
Volume
51
Year of publication
1995
Part
9
Pages
1731 - 1732
Database
ISI
SICI code
0108-2701(1995)51:<1731:PPA3K>2.0.ZU;2-E
Abstract
The paraelastic phase of lead aluminium fluoride, Pb5Al3F19, forms abo ve a transition temperature of about 360 K. The structure contains cor ner-sharing chains of AlF6 octahedra, individual AlF6 octahedra, indiv idual F- ions and Pb2+ ions. Both sets of independent AlF6 octahedra a re slightly distorted, with AlF distances of 1.79(3) and 1.80(2) Angst rom. The transition from the ferroelastic phase is weakly first order [Ravez, Andriamampianina, Simon, Rabardel, Ihringer & Abrahams (1994). J. Appl. Cryst. 27, 362-368].