Polymorphism of new rubidium magnesium monophosphate
- Laboratoire de Chimie de la Matiere Condensee de Paris, CNRS-UMR7574, ENSCP-ParisTech, UPMC University Paris 06, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 (France)
- Laboratoire de la Matiere Condensee et de l'Environnement, Universite Cadi Ayyad, Faculte des Sciences-Semlalia, Marrakech (Morocco)
Novel phase RbMgPO{sub 4}, synthesized by solid state reaction, sustains phase transitions at 169 and 184 {sup o}C. The medium ({beta})- and high- ({gamma}) temperature forms (orthorhombic, respectively Pna2{sub 1} and Pnma, Z=4) are typical stuffed tridymites but the ambient form ({alpha}) exhibits an unusual three-fold Pna2{sub 1} superstructure that results from the change of coordination of one third of the Mg atoms. Cell parameters are as follows: for {alpha}: a=26.535(1) A, b=9.2926(3) A, c=5.3368(2) A; for {beta}: a=8.7938(3) A, b=9.3698(3) A, c=5.3956(1) A; for {gamma}: a=8.7907(3) A, b=5.4059(1) A, c=9.3949(3) A. - Graphical abstract: Superstructure h k l, h{ne}3n diffraction peaks of low-temperature RbMgPO{sub 4} results of the transformation of 1/3 of the MgO{sub 4} tetrahedra into MgO{sub 5} pyramids.
- OSTI ID:
- 21432473
- Journal Information:
- Journal of Solid State Chemistry, Vol. 183, Issue 9; Other Information: DOI: 10.1016/j.jssc.2010.07.016; PII: S0022-4596(10)00298-7; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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