Electron Channeling X-ray Spectroscopy and its Application to Structure Analysis of Crystalline Materials

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  • 電子線で今何ができるか　　１．電子線結晶構造解析の最先端　　チャンネリングを用いたサイト選択解析：ＡＬＣＨＥＭＩ
  • チャンネリング オ モチイタ サイト センタク カイセキ ALCHEMI

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Abstract

This paper first summarizes principles of electron channeling X-ray microanalysis (ALCHEMI) and then describes a recent achievement in quantitative structure analysis of MgO⋅nA12O3 spinel compounds. The orientation dependent intensity variation of emitted X-rays under dynamical electron diffraction conditions is so sensitive to lattice-ion configuration in the illuminated areas that the occupation probabilities on specific positions in the crystal lattice can be determined accurately through comparison with the theoretical rocking curves. The measurements have characterized partially disordered cation configuration in MgO⋅nA12O3 crystals as a function of composition as well as irradiation-induced disordering.

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