The synthesis of metavivianite and the oxidation sequence of vivianite

A mixture of metavivianite, vivianite, and spheniscidite was obtained from an aqueous solution of FeSO 4 ·7H 2 O and (NH 4 ) 2 HPO 4 at temperatures between 50 and 60 °C. The oxidation sequence of partially oxidized vivianite toward santabarbaraite or a solid solution between β – Fe 2 (PO 4 )O and Fe 4 (PO 4 ) 3 (OH) 3 , without passing through metavivianite, was also demonstrated.

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