Substitution of Mg2+and Fe2+in the Trigonal-Bipyramidal-Coordinated Site in[beta]''-(Mg, Fe)Al(PO4)O

Knitter, St, Schmid-Beurmann, P. and Cemic, L. (1999) Substitution of Mg2+and Fe2+in the Trigonal-Bipyramidal-Coordinated Site in[beta]''-(Mg, Fe)Al(PO4)O Journal of Solid State Chemistry, 142 (1). pp. 51-56. DOI 10.1006/jssc.1998.7984.

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Abstract

Solid solution compositions in the system FeAl(PO4)O-MgAl(PO4)O were synthesized hydrothermally at 735°C and 0.2 GPa and controlled oxygen fugacities. X-ray powder diffraction studies reveal that under these conditions a complete solid solution series is formed. It is characterized by the substitution of Mg2+and Fe2+in a fivefold-coordinated trigonal-bipyramidal site. The solid solution compositions are isotypic with the end members, having the[beta]''-MgAl(PO4)O structure, and crystallize in the monoclinic space groupP21/c.57Fe-Mössbauer spectroscopic measurements show that these phases are paramagnetic at room temperature. They are characterized by an isomer shift between 1.18 and 1.20 mm/s relative to[alpha]-iron and a compositionally dependent quadrupole splitting between 2.52 and 2.61mm/s for high-spin57Fe2+in the trigonal-bipyramidal-coordinatedMe2+site.

Document Type: Article
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.1006/jssc.1998.7984
ISSN: 0022-4596
Date Deposited: 02 Feb 2012 09:15
Last Modified: 09 Oct 2012 03:57
URI: http://eprints.uni-kiel.de/id/eprint/15535

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