X-ray powder diffraction and57Fe Mössbauer spectroscopy study of the thermal breakdown of vivianite,Fe3(PO4)2.8H2O |
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| Authors: | J C Waerenborgh M O Figueiredo |
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| Institution: | (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 |
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| 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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