Fine Structures of X-ray Absorption Spectra Of Cobalt in the Face Centered Cubic Lattice and Close-packed Hexagonal Lattice

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Samples of cobalt of the α-modification (hexagonal close-packed lattice) and the β-modification (face centered cubic lattice) and their mixtures were prepared, and their crystal structures were examined by means of the X-ray diffraction method. Fine structures of the X-ray K absorption spectra of these cobalt samples were photographed by a bent crystal spectrograph and the mass absorption coefficients in the X-ray K absorption spectral region were measured by using the North American Philips Diffraction Unit and Wide Range Spectrometer modified to a tube spectrometer with a Geiger-Muller counter. By comparing these photometer curves of these spectrograms or the recorded curves, the fine structures of the absorption spectra of these cobalt samples were found to be very similar. The wavelength values and the mass absorption coefficient of the fine structures of the absorption spectra also nearly coincided within experimental errors, and thus the position and the form of the maximum and minimum of these structures were found to be the same. We conclude that this is due to the fact that atoms in the α-cobalt have the same immediate surroundings as those in the β-cobalt.
社団法人日本物理学会の論文
1957-06-05