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a rhombohedral structure. Above pressures of 14 GPa, the body-centered tetragonal Ga-III is stabilised. At extreme pressures of around 120 GPa, the Ga-IV phase with a face-centered-cubic structure is formed. At simultaneous high-pressure and high-temperature conditions, liquid gallium experiences an increase in atomic packing towards 12 nearest-neighbours expected for a simple metallic liquid. However, while pressure causes liquid gallium to resemble a simple hard-sphere liquid,

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