エネルギー分散型電子線マイクロアナライザーによる沸石族の定量分析

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  • 吉原 聡
    京都大学大学院理学研究科地質学鉱物学教室 現住所: 日本電気硝子株式会社 生体材料開発室

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タイトル別名
  • Quantitative micro-analysis of zeolite group minerals by electron-probe microanalyzer with an energy dispersive spectrometer system.
  • エネルギー ブンサンガタ デンシセン マイクロアナライザー ニ ヨル フッセキゾク ノ テイリョウ ブンセキ

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説明

This paper reports a technique of quantitative micro-analysis of zeolite group minerals by electron-probe microanalyzer with an energy-dispersive spectrometer system. Natural analcite, laumontite, heulandite and stilbite were used as reference samples. To avoid radiation damages of zeolites, beam diameters of quantitative analysis for each zeolite are set as follows; analcite and laumontite can be analyzed by defocused beam with ca. 5 microns in diameter, our laboratory routine analytical conditions, heulandite and stilbite have to be analyzed by scanning beam with 12.5 microns square or more.<br>Heulandite and stilbite have the same anhydrous formula of CaAl2Si7O18; A water content of heulandite with ideal formula is 15.74 wt.% and that of stilbite with ideal formula is 17.89 wt.%. In analyzing these zeolites, total weight percent of anhydrous oxides sometimes falls between the values expected for two zeolites with ideal formula. As precision of analysis of the crystalline water for two zeolites, which were estimated by the difference between 100 and total weight percent of anhydrous oxides determined, is less than 2 wt.%, the varying anhydrous total is considered real. Thus, the zeolites which have intermediate composition between heulandite and stilbite can not be identified by the present procedure.

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  • 岩石鉱物科学

    岩石鉱物科学 29 (2), 14-19, 2000

    一般社団法人　日本鉱物科学会

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