STMによるモリプデン脆性破面の観察とフラクタル特性

概要

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Brittle fracture surfaces at room temperature (〜25℃) and -196℃ for molybdenum single crystal were observed with scanning tunneling microscopy (STM) and scanning electron microscopy (SEM). STM images obtained showed that the fine cleavage steps were formed on the fracture surfaces. The images were analyzed by fractal geometry. Brittle fracture surface of molybdenum single crystal had self-similarity (i.e., fractal character) up to very high magnification where the scanning range of 40 nm in X and Y directions corresponded to about 150 atoms of molybdenum. However, this charactor was expected to break down when the scanning range in X and Y directions were below 20 nm. This is confirmed by STM image with the scanning range of 16 nm, where the cleavage step was not observed.
社団法人日本機械学会の論文
1991-09-25