Abstract
In the thermal decomposition of NH4VO3 to V2O5, the changes in crystallographic orientation were studied by using single crystals of NH4VO3 prepared by recrystallization from aqueous solution. X-Ray diffraction (XRD) measurements clearly showed that a shrinkage took place along b axis of NH4VO3 up to 180 °C and V2O5 sheets started to be formed in parallel to ab plane of NH4VO3 above 205 °C. These changes in crystallographic orientation were confirmed through the reverse reactions to NH4VO3. Crack formation during the decomposition, observed with scanning electron microscopy (SEM), was consistent with the topotactic changes observed.
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