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Synthesis and Phase Characterization of a Solid Solution Series between β-Fe2(PO4)O and Fe4(PO4)3(OH)3

✍ Scribed by P. Schmid-Beurmann

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
402 KB
Volume
153
Category
Article
ISSN
0022-4596

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✦ Synopsis

An intermediate solid solution series was synthesized in the quaternary system FeO+Fe 2 O 3 +P 2 O 5 +H 2 O between the compositions of Fe 2 (PO 4 )O and Fe 4 (PO 4 ) 3 (OH) 3 hydrothermally at 5863C and 0.3GPa. Quantitative XRPD studies in combination with chemical bulk analysis reveal that under these conditions an intermediate solid solution series is formed in the above-mentioned quarternary system. It was found to range between 0.184x40.60 according to a stoichiometry of Fe 3؉ 4؊x Fe 2؉ 3x (PO 4 ) 3 (OH) 3؊3x O 3x . In the range of 0.024x40.18 a twophase 5eld exists under these conditions between the limiting member of the intermediate solid solution and Fe 4 (PO 4 ) 3 (OH) 3 with a small miscibility region in direction of Fe 2 (PO 4 )O. On the other hand, the hypothetical end-member Fe 2 (PO 4 )O could not be synthesized under these conditions. Using standard X-ray powder di4raction in combination with the Rietveld method, the members of the solid solution were found to crystallize analogously to -Fe 2 (PO 4 )O in the tetragonal space group I4 1 /amd. The solid solutions are characterized by a disordered distribution of Fe 2؉ , Fe 3؉ , and vacancies over the single octahedrally coordinated Me (8f ) site.

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