Hot‐pressing powdered magnesium fluoride resulted in a polycrystalline compact with essentially the density and transmittance of a single crystal. Compacted powdered MgF 2 was heated to 650°C and held under a pressure of 30,000 psi for 15 minutes. The starting material had to be free from impurities which would form a second phase, and the presence of water and bound hydroxyl groups had to be minimized. Overheating caused the starting material to resist hot‐pressing. It is postulated that mechanical bulk decrease was followed by plastic deformation during pressing and that both solid and surface diffusion of material took place to complete the coalescence of the grains.
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BUCKNER et al. (1962) studied this question.
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