Measurements for Diffusion Coefficients of Hydrogen in Solids at High Pressures Using Micro-Raman Spectroscopy

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  • NOGUCHI Naoki
    Graduate School of Technology, Industrial and Social Sciences, Tokushima University

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  • 顕微ラマン分光法による高圧力下における固体の水素拡散係数測定
  • ケンビラマン ブンコウホウ ニ ヨル コウアツリョク カ ニ オケル コタイ ノ スイソ カクサン ケイスウ ソクテイ

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Abstract

<p>We have developed an isotope analysis method to measure hydrogen isotope diffusion profiles in ice, hydroxides and related materials at high pressure. The calibration curves for quantitative analysis of deuterium in the materials were constructed using micro-Raman spectroscopy. Hydrogen-deuterium exchange diffusion experiments of ices VI, VII and Ca(OH)2 up to 20 GPa were carried out using micro-Raman spectroscopy and a diamond anvil cell. The pressure dependences of the diffusion coefficients of hydrogens in ice VII and Ca(OH)2 showed that hydrogen migration mechanisms changed drastically at high pressures. The changes in the mechanisms must be caused by strengthening of hydrogen bonds. This article describes the methodology and background for study of hydrogen diffusion in solids at high pressure.</p>

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  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 70 (6), 351-362, 2021-06-05

    The Japan Society for Analytical Chemistry

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