Polymorphism of new rubidium magnesium monophosphate |
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| Authors: | Rajia Ait Benhamou Gilles Wallez Pascal Loiseau Mohamed Elaatmani Abdelwahed Zegzouti |
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| Institution: | a Laboratoire de Chimie de la Matière Condensée de Paris, CNRS-UMR7574, ENSCP-ParisTech, UPMC University Paris 06, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
b Laboratoire de la Matière Condensée et de l’Environnement, Université Cadi Ayyad, Faculté des Sciences-Semlalia, Marrakech, Morocco |
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| Abstract: | Novel phase RbMgPO4, synthesized by solid state reaction, sustains phase transitions at 169 and 184 °C. The medium (β)- and high- (γ) temperature forms (orthorhombic, respectively Pna21 and Pnma, Z=4) are typical stuffed tridymites but the ambient form (α) exhibits an unusual three-fold Pna21 superstructure that results from the change of coordination of one third of the Mg atoms. Cell parameters are as follows: for α: a=26.535(1) Å, b=9.2926(3) Å, c=5.3368(2) Å; for β: a=8.7938(3) Å, b=9.3698(3) Å, c=5.3956(1) Å; for γ: a=8.7907(3) Å, b=5.4059(1) Å, c=9.3949(3) Å. |
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| Keywords: | Phosphates Crystal structure Rietveld analysis Phase transitions |
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