Abstract
The transition of singular crystal surfaces into nonsingular surfaces on the equilibrium form of negative naphtalene crystals is observed when a certain critical temperature is surpassed. At low temperatures the equilibrium form possesses flat regions with crystallographic indexes {001}, {110}, {201̄} and {111̄} connected by rounded edges and points. On elevating the temperature the equilibrium form becomes rounded. It is established that the critical temperature for the surfaces {110}, {201̄} and {111̄} is by 10° lower than the melting point while no visible changes are observed for the most close packed surface {001} on heating the crystal very close to the melting point. The experimental results are compared with previous results obtained in this laboratory on similar phenomena with diphenyl.
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