Abstract
Abstract Phase transitions in submicrometre gallium droplets confined in epoxy resin are revealed by single-energy X-ray absorption spectroscopy using synchrotron radiation, a technique previously applied in high-temperature studies of solid and liquid metals. These unconventional measurements are accompanied by a detailed characterization of samples using scanning electron microscopy and adiabatic calorimetry measurements. Exceptional undercooling down to 150 K is confirmed by the present data. Specific heat measurements performed during the warming cycles confirmed the presence of three different solid phases for gallium, namely β-Ga, γ-Ga and δ-Ga and the absence of the α-Ga stable phase at ambient conditions.
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