Abstract
Mesostructured VPO phases were obtained by soft-chemistry approaches in the presence of charged surfactants. These phases underwent phase transformations to various mesostructured and amorphous VPO phases during thermal treatment in N 2 at 400 °C. Lamellar-to-hexagonal, hexagonal-to-disordered mesostructure and cubic-to-amorphous transformations were followed by XRD and in situ Raman spectroscopy. XRD detected the long-range structural changes in the mesostructured VPO phases during these phase transformations. Raman spectroscopy is sensitive to the short-range order in mixed metal oxides and provided complementary information on the nature of the local structural changes in the V–O–P framework and surfactant molecules during these transformations. The onset of these transformations below template decomposition temperatures is discussed in terms of the changes in the surfactant packing parameter, g.
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