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Anomalous Sputtering Of Single Crystal Ni In Close-packed Directions At The Curie Point

V. Yurasova, L. B. Shelyakin, D. Akimov, A. Mosunov, J. Colligon
Published 1997 · Chemistry

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Abstract The spatial distribution of particles sputtered from the (001) face of Ni single-crystals is studied as a function of temperature. A significant increase in sputtering intensities both in the (011) directions and in random directions is found experimentally near the Curie point (T c = 635 K). The temperature dependence of mean-square angular deviation ψ2 of sputtered particles from close-packed (011) directions was determined both experimentally and by computer simulation. Except for a near-T c region, ψ2 increases linearly with temperature in agreement with the result of the computer calculation. At the Curie point, the experimental ψ2 has a sharp peak (corresponding to the value of ψ at 1200 K, determined by computer calculations). This result suggests a significant increase in displacement amplitude of surface atoms near T c, and gives a method for its estimation from sputtering patterns.
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