Abstract
Molybdenum trioxide (MoO3) has been studied by four thermal analysis techniques. The as-synthesized material has hexagonal structure (h-MoO3). The phase change in the material studied using four thermal analysis techniques: thermogravimetric analysis, differential scanning calorimetry (DSC), thermomechanical analysis, and dynamic mechanical analysis. Crystallography phase transformation of h-MoO3 was found between 675 and 701 K by these techniques. DSC technique provided the highest detection sensitivity at about 690 K since the metastable monoclinic phase (β-MoO3) transformation could be observed before reaching the stable orthorhombic (α-MoO3) phase. The crystallographic phases of particles and morphologies were confirmed by X-ray diffraction and scanning electron microscopy techniques. The h-MoO3 was proposed as a standard sample to validate the operations of the thermal analysis instruments.
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