Kinetically Controlled Reduction of β-Vanadyl(V) Orthophosphate: Synthesis and Characterization of New Metastable Polymorphs of Vanadium(III) Phosphate.

Two thermodynamically metastable polymorphs of vanadium(III) phosphate, VPO-1 and VPO-2, have been obtained via reduction of β-VOPO by moist hydrogen. The XRPD pattern of VPO-1 can be assigned based on the crystal structure of β-VOPO, though with distinctly different lattice parameters (VPO-1/β-VOPO: , = 7.3453(12)/7.