Abstract
The temperature dependence of the morphology of highest purity diphenyl crystals grown from the vapour phase has been investigated. The existence of a transition of natural faces from flat to rounded is demonstrated and the transition temperatures for different crystal faces are determined. These transitions, i.e. the appearance of nonsingular faces, are considered as roughening transition (i.e. “surface melting”) of the crystal surfaces of diphenyl. The results represent a further development of earlier studies and prove that interferences by impurities were absent in these studies.
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