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Title: Structure of ice
Authors: Polytechnic Institute of Brooklyn. Dept. of Physics.
Brill, Rudolph.
Keywords: Ice
Ice crystals
Ice crystal growth
Structural analysis
Ice dielectrics
X-ray diffraction
Publisher: U.S. Army Snow, Ice, and Permafrost Research Establishment.
Engineer Research and Development Center (U.S.)
Series/Report no.: SIPRE report ; 33.
Description: Technical Report
Abstract: The procedures for growing samples of ice used in the experiments are described. Experiments using the method of bending bars of ice to determine their viscoelastic behavior were made. Tests were conducted on single crystals with various orientations, polycrystalline samples, and mixed crystals of ice-NH4F (ammonium fluoride). These tests showed that the hexagonal base plane is the gliding plane at plastic deformation and that Becker's equation can be used for the description of the viscoelastic creep of ice. Studies show that amounts up to 10% of NH4F may be absorbed in the ice lattice. Dielectric studies indicate that the relaxation time τ˳ decreases markedly with increasing concentration of NH4F, down to a minimum value corresponding to some concentration between 0.1 and 1% NH4F, and then increases again with further increasing concentration. The dc resistivity of ice-NH4F increased with the concentration of NH4F. Investigations were also carried out using x-ray diffraction techniques to determine the thermal amplitudes of H2O molecules as well as of hydrogen atoms in ice. The molecular vibration can be described by a characteristic temperature of θ = 220K.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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