Influence of reaction conditions on the electrochemical-hydrothermal synthesis of two ammonium vanadium phosphates: (NH4)2VO(HPO4)2·H2O and (NH4)2VO(V0.88P1.12O7)
Abstract
The new phase (NH
4
)
2
VO(HPO
4
)
2
·H
2
O, 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) Å
3
. When the reaction temperature is increased to 110 °C, 1 is completely transformed into the known compound (NH
4
)
2
VO(V
0.88
P
1.12
O
7
), 2. The layered compound NH
4
VOPO
4
·xH
2
O, 3, a new example of the well-known M
x
VOPO
4
·xH
2
O phase has also been prepared by the same technique.
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