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Substitution of Mg2+and Fe2+in the Trigonal-Bipyramidal-Coordinated Site inβ″-(Mg, Fe)Al(PO4)O

✍ Scribed by St. Knitter; P. Schmid-Beurmann; L. Cemič

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
241 KB
Volume
142
Category
Article
ISSN
0022-4596

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✦ Synopsis

Solid solution compositions in the system FeAl(PO 4 )O-MgAl(PO 4 )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 Mg 2؉ and Fe 2؉ in a fivefold-coordinated trigonal-bipyramidal site. The solid solution compositions are isotypic with the end members, having the -MgAl(PO 4 )O structure, and crystallize in the monoclinic space group P2 1 /c. 57 Fe-Mo¨ssbauer 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 -iron and a compositionally dependent quadrupole splitting between 2.52 and 2.61 mm/s for high-spin 57 Fe 2؉ in the trigonal-bipyramidal-coordinated Me 2؉ site.

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