Abstract
Static-temperature and pressure factors can drive unique transition pathways on the same test sample, and one of the classic examples is TiO2. However, the phase stability order and transition pathways are greatly altered under dynamic shocked conditions. Herein, we study the structural and morphological responses of tungsten oxide nanoparticles (γ-WO3 NPs) under acoustic shock conditions, and the observed structural results are compared with shocked anatase-TiO2 NPs. From the static compression and heating experiments, the stability order is found to be anatase-TiO2>γ-WO3 NPs.
However, according to the present experimental results, the stability order is found to be γ-WO3 > anatase-TiO2 NPs. A thermal conductivity-dependent superheating approach is adopted to explain the stability order. The investigation provides a new frame of knowledge to understand the structural response and its transition pathways under static compression and acoustic shock conditions, which may lead to a new chapter to understand the structural phase transitions in solids.
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