Transparent polycrystalline specimens can be fabricated from fine MgO powder with a small LiF addition by a two‐step process: hot‐pressing and heat‐treating. The LiF addition allows MgO to be hot‐pressed to near theoretical density at reduced temperatures and stresses. The stress‐temperature‐time conditions must be designed to attain a hot‐pressed density of at least 99.5% of the theoretical density of MgO to obtain a transparent specimen during the subsequent heat treatment used in this study. Possible densification mechanisms are discussed.
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Benecke et al. (1967) studied this question.
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