Formation of near stoichiometric A15Nb3Si from annealing an amorphous alloy under high pressure |
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| Authors: | W K Wang Y J Wang S A He H Iwasaki |
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| Institution: | (1) Center of Condensed Matter and Radiation, CCAST (World Laboratory), Beijing, China;(2) Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, No. 34, Beijing, China;(3) The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai, Japan;(4) Present address: Photon Factory, National Laboratory for High Energy Physics, 305 Oho, Ibaraki-ken, Japan |
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| Abstract: | The A15Nb3Si with a composition closed to stoichiometric compound has been synthesized under high pressure from a starting material of Nb77Si23 amorphous alloys. High pressure annealing was carried out in Bridgman anvils apparatus. The amorphous alloy would decompose into A15Nb3Si, bcc Nb solid solution and hexagonal phase when it was annealed under a pressure lower or a temperature higher than that for forming single phase A15Nb3Si. The yielded A15Nb3Si exhibited a superconducting transition temperatureT
c
of 19.1 K, and has been indexed unambiguously with a lattice parameter ofa=0.5093 nm. Moreover, a nonlinear relationship betweenT
c
anda has been constructed from our experimental data, and aT
c
of 27 K for stoichiometric A15Nb3Si can be expected. |
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