FIELD ION MICROSCOPY OF IRON WHISKERS.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK
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Field ion microscopy of non-refractory metals was improved by the use of neon and neon-helium gas mixtures. A limited number of iron whiskers was observed and found to contain a high density of lattice defects, such as impurity atoms, single dislocations, and dense dislocation areas of an almost amorphous structure, particularly in the 111 region. The latter defect is an artifact caused by the stress of the evaporation field. Further progress will depend upon a reduction of this field, and the use of an image intensifier. Author