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A new orthorhombic high-pressure phase of NiSi has been synthesized in a multi-anvil press at 1223–1310 K and 17.5 GPa. Its crystal structure has been determined and found to be closely related to that of a tetragonal form of NiSi predicted previously to be stable at high pressure by ab initio computer simulations.

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A thermal equation of state for the deuterated analogue of mirabilite has been fitted to high-pressure neutron powder diffraction data and used to obtain a range of thermodynamic quantities required for modelling the structure and dynamics of icy satellite interiors.
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