X線回折法による1-5型サマリウムコバルト磁石合金の定量解析

概要

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It has been generally believed hitherto that X-ray powder diffraction is not suitable for precise quantitative analysis of crystalline materials, owing to its low sensitivity for minor components with its comparatively poor SIN ratio. In this study, this difficulty was greatly reduced by using a high power X-ray diffractometer controlled precisely by a computer system. In order to confirm it, the quantitative analysis of SmCo5 magnet alloys with excess samarium than the stoichiometric composition was carried out. A small amount of Sm2Co7 phase as low as 0.1 wt% in SmCo5 powder was accurately determined by utilizing the Sm2Co7-SmCo5 calibration curve established here, in which the correlation coefficient was 99.90. Sm2Co7 have not been detected but Sm2O3 in TDK SmCo5 magnets. Moreover, the results were confirmed by other structure analysis methods such as X-ray composition image analysis, X-ray diffraction for small limited area and Auger electron spectroscopy. Their results agreed with the quantitative analysis by X-ray diffraction.
社団法人粉体粉末冶金協会の論文