X-ray powder diffraction and57Fe Mössbauer spectroscopy study of the thermal breakdown of vivianite,Fe3(PO4)2.8H2O期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

X-ray powder diffraction and57Fe Mössbauer spectroscopy study of the thermal breakdown of vivianite,Fe3(PO4)2.8H2O

Authors:	J. C. Waerenborgh M. O. Figueiredo

Affiliation:	(1) Departamento de Química, IdE, LNETI, Estrada Nacional 10, 2685 Sacavém, Portugal;(2) Centro de Cristalografia e Mineralogia, IICT, Alameda Afonso Henriques, 41-4-0E, 1000 Lisboa, Portugal

Abstract:	Ferric phosphates resulting from the thermal breakdown of natural Fe₃(PO₄)₂.₈H₂O are studied by X-ray powder diffraction and Mössbauer spectroscopy. Total iron oxidation and water release give rise to an amorphous material. During heating, a transitional cristobalite-type ferric orthophosphate recrystallizes prior to the stable berlinite-type. The main additional final product is a poorly characterized “Fe₃PO₇” phase with iron in octahedral coordination.

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