Polymorphism of new rubidium magnesium monophosphate

Journal Article · Wed Sep 15 04:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.07.016· OSTI ID:21432473

Ait Benhamou, Rajia ^[1]; Wallez, Gilles ^[1]; Loiseau, Pascal; Viana, Bruno ^[1]; Elaatmani, Mohamed; Daoud, Mohamed; Zegzouti, Abdelwahed ^[2]

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1. 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)
2. 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, Journal Name: Journal of Solid State Chemistry Journal Issue: 9 Vol. 183; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
MAGNESIUM COMPOUNDS
ORTHORHOMBIC LATTICES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RUBIDIUM COMPOUNDS
SCATTERING