Abstract

The structural changes between NH 4VO 3 and V 2O 5 are discussed from the results of decomposition and subsequent curing experiments starting with single crystals of NH 4VO 3 with well developed be and ac planes. The structural change from NH 4VO 3 to V 2O 5 was divided into five steps, including the first step up to 150 °C to keep the original NH 4VO 3 structure and the final 5th step to be V 2O 5. The preferred orientation of V 2O 5 crystallites in particles was found to be strongly influenced by the heating rate. The crystal heated up to the 2nd step (150–180 °C) could recover exactly the same single crystal by curing in saturated vapour of NH 3-H 2O at 25 °C. The curing of crystals heated above the 4th step (above 210 °C) resulted in a polycrystalline powder of NH 4VO 3. Structural changes during decomposition and curing between NH 4VO 3 and V 2O 5 are discussed.

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