Abstract
Possible twinned structures in natural ice crystals, especially in natural snow crystals, are discussed on the basis of the concept of Coincidence-Site Lattice (CSL). Investigations of the crystal orientation of individual grains in various natural polycrystalline ice have disclosed some predominant misorientation angles between two neighboring component crystals. When the CSL theory is applied to the boundary structure in ice, junctions satisfying relations of 70.3°/ [1120], 38.8°/ [1120], 44.2°/ [1010], 60.0°/ [0001], 27.8°/ [0001] and 21.8°/ [0001] are found to be possible boundaries having good atomic fits and low energies. At last, the mechanism of formation of twinned snow crystals is discussed in reference to the possible formation of the cubic structure of ice at the time of nucleation.
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