Rate of Nucleation of Copper Sulphate in Vacuum

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THE rate of growth of the centres of dehydration of CuSO4.5H2O varies with the crystal direction. On the large faces of the crystal, the nuclei grow in the form of a cross and the direction of the arms of the cross are parallel to two of the crystal axes. The underlying surfaces of the nuclei prove to be very complex, for a disc of dehydrated material is found to be suspended from the longer arm of the cross. This disc passes into the crystal at an angle of approximately 33°.

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    Cf. S. V. Izmailov, Phys. Z. Sowjet Union, 4, 835; 1934.

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