Abstract
Redox intercalation of NH 4 + into vanadyl phosphate dihydrate (VOPO 4·2H 2O) leads to a two-phase (NH 4) x VOPO 4·H 2O ( x=0.2−0.9) compound with interlayer distances of 6.7 and 6.4 Å. Ammonium ions can be incorporated into the interlayer space of VOPO 4 also by an ion exchange, starting from alkali-metal redox-intercalated vanadyl phosphate Me x VOPO 4· yH 2O ( Me=Li, Na, K, Rb). Several phases are formed during the ion exchange, one of them with the interlayer distance corresponding to the original Me x VOPO 4· yH 2O phase, the second one corresponding to formed (NH 4) x VOPO 4·H 2O. In addition, a third phase is formed by the ion exchange when Li 0.98VOPO 4·1.98H 2O or Rb 0.60VOPO 4·1.3H 2O are used as starting compounds. An opposite ion exchange of NH 4 + for Me + starting from (NH 4) x VOPO 4·H 2O does not proceed.
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