Influence of reaction conditions on the electrochemical-hydrothermal synthesis of two ammonium vanadium phosphates: (NH₄)₂VO(HPO₄)₂·H₂O and (NH₄)₂VO(V_0.88P_1.12O₇)

Abstract

The new phase (NH₄)₂VO(HPO₄)₂·H₂O, 1, has been synthesized by hydrothermal electrocrystallization at 100 °C. 1 is triclinic, space group P1 with Z=2, a=7.2499(8), b=8.1244(9), c=8.6529(9) Å, α=73.472(2), β=80.085(2), γ=85.077(2)° and V=480.94(9) ų. When the reaction temperature is increased to 110 °C, 1 is completely transformed into the known compound (NH₄)₂VO(V_0.88P_1.12O₇), 2. The layered compound NH₄VOPO₄·xH₂O, 3, a new example of the well-known M_xVOPO₄·xH₂O phase has also been prepared by the same technique.

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