Abstract
The periodic instability of the diameter of whiskers grown by the vapor-liquid-solid (VLS) mechanism is studied. This phenomenon is especially distinct for silicon whiskers and, to a lesser degree, for germanium whiskers. The instability develops only in whiskers of submicron (≲ 0.5 μ) diameters, the smaller the mean diameter, the more distinct is the periodicity, i.e. it occurs in the range of sizes where the Gibbs-Thomson effect manifests itself. The occurrence of the instability is related to experimental conditions such as crystallization temperature, supersaturation and impurities. Some morphological details of the whiskers are also studied. A working hypothesis to explain the instability is presented.
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