Influence of the grain morphology of V2O5 on its reduction-reoxidation behaviour

The influence of the grain morphology of V₂O₅ on its reduction-reoxidation behaviour has been investigated by means of thermoanalytical methods. X-ray analysis and electron microscopy. Well-developed V₂O₅ platelets exposing predominantly the (010) face exhibited a significantly different reduction profile than poorly defined agglomerates of microcrystalline V₂O₅. Intermediate phases detected during reduction were V₆O₁₃ and VO₂ (rutile). The corresponding reoxidation profiles were found to be only weakly dependent on the grain morphology of V₂O₃. Electron microscopy showed that the original grain morphology of the V₂O₅ samples was not influenced markedly by the reduction-reoxidation cycle.