The influence of silicon on the crystallographic phases of the niobium-gallium system studied by x-ray diffraction methods |
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Authors: | A. Herold,G. Fö rsterling,K. Kleinstü ck,E. M. Savitski,Y. V. Yefimov,M. J. Bytschkova,B. N. Sumarokov |
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Abstract: | The influence of silicon on the crystallographic phases of the binary niobium-gallium system is studied by X-ray diffraction methods. The samples were prepared by rapid quenching. Silicon substituted gallium in all phases of the binary system. It exists a complete pseudobinary solid solution Nb5Ga3-Nb5Si3. The maximum degree of substitution in the A 15 phase Nb3Ga1–xSix is x = 0.5. The presence of two A 15 phases with different cell parameters indicates the existence of a miscibility gap. Contrary to the expections the supercondusting transition temperatures decreases with an increasing degree of substitution. |
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