A Peroxoniobium Phosphate Derived from NbOPO4⋅3H2O

Author: Moreno-Real L.   Losilla E.R.   Aranda M.A.G.   Martínez-Lara M.   Bruque S.   Gabás M.  

Publisher: Academic Press

ISSN: 0022-4596

Source: Journal of Solid State Chemistry, Vol.137, Iss.2, 1998-05, pp. : 289-294

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Abstract

The reaction between white NbOPO4⋅3H2O and H2O2 produces yellow NbO(O2)0.5PO4⋅2H2O. This reaction can be considered as an intercalation process since the Nb|P ratio and the basic layered structure are preserved. The X-ray powder diffraction pattern of the new phosphate can be indexed on a tetragonal unit cell with a=6.488(1) Å and c=16.030(4) Å. X-ray powder thermodiffractometry, DTA–TGA, Raman and IR spectroscopies, and magnetization measurements are used to characterize the new compound. The intercalated dioxygen bonds directly to niobium, replacing the water. Half of the initial NbO6 groups change to NbO7 since dioxygen acts a chelated ligand interacting with Nb through the two oxygens simultaneously.