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.

中文翻译：

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通过四种热分析技术对h-MoO 3进行相变

三氧化钼（MoO ₃）已通过四种热分析技术进行了研究。合成后的材料具有六方结构（h-MoO ₃）。使用四种热分析技术研究材料的相变：热重分析，差示扫描量热法（DSC），热机械分析和动态力学分析。通过这些技术，发现了h-MoO _3的晶体学相变在675和701 K之间。DSC技术提供在约690 k中的最高检测灵敏度由于亚稳单斜晶相（β-的MoO ₃）转化可以达到稳定的斜方前可观察到（α-的MoO ₃）阶段。通过X射线衍射和扫描电子显微镜技术确认了颗粒的结晶相和形态。有人建议将h-MoO ₃作为标准样品，以验证热分析仪器的操作。