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The empirical linear relation between volume and logarithm of bulk modulus, discovered by Grover, Getting and Kennedy, is taken as the basis for a new pressureÈvolume equation of state. This linear relation and the equation of state have the same two substance-dependent parameters, the values of which can be derived from low-pressure data. For MgO, in the temperature range 100È3100 K and the pressure range 0È225 GPa, it is shown that the new methodology allows the careful calculation of high-pressure thermodynamic properties : all available experimental data are reproduced with great precision.

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LiF-BeF 2 and LiF-BeF 2 -ThF 4 are key systems for Molten Salt Reactor fuel. The liquid phase of these systems has been assessed using Redlich-Kister polynomials. The result shows a miscibility gap on the BeF 2 -rich side. This has never been proven experimentally. Nevertheless, evidence for a two liquids region is given by the fact that such a region exists in the analogous MgO-SiO 2 system. Also the ternary system LiF-BeF 2 -ZrF 4 contains such a miscibility gap in the BeF 2 corner.

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