Abstract
The reaction between white NbOPO4·3H2O and H2O2produces 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 witha=6.488(1) Å andc=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 NbO6groups change to NbO7since dioxygen acts a chelated ligand interacting with Nb through the two oxygens simultaneously.
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