Mechanisms for the thermal decomposition of NH4VO3 into V6O13, V3O7 and V2O5

Abstract

The thermal decomposition of ammonium metavanadate, NH₄VO₃, has been studied by differential scanning calorimetry (DSC), mass spectrometry (MS) and X-ray diffraction (XRD) in the temperature range 50–500 °C. Different experimental conditions (heating rate and atmosphere) have been explored in various combinations. Different types of reaction mechanisms leading to crystalline V₆O₁₃ and V₃O₇ can be identified. The formation of V₂O₅ is also discussed briefly.