Field-Evaporation End Form of Tantalum

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Abstract
A field‐evaporation end form depends in a complicated way upon many factors. The end form of a pure and nearly perfect metal crystal as obtained under various conditions must be established experimentally to permit proper interpretation of field‐ion micrographs of general specimens of that metal. The end form of tantalum, distinctly different from other bcc metals such as tungsten, molybdenum, and iron, is shown in its dependence on temperature, hydrogen promotion, and field‐stress‐induced slip. Low‐coordination atom sites stabilized by polarization occur in specific crystallographic regions.