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[en] A composite superconductor which comprises (1) a first layer of an alloy selected from the group consisting of a vanadium-gallium (V-Ga) alloy with a gallium content from 12.5 at. % to 17.5 at. %, a niobium-tin alloy (Nb-Sn) with a tin content from 12 at. % to 17.5 at. %, and a vanadium-silicon (V-Si) alloy with a silicon content from 10.0 at. % to 20.0 at. %; (2) an intermediate layer of an A-15 compound selected from the group consisting of V3Ga, Nb3Sn, and V3Si; (3) a third layer of an alloy selected from the group consisting of copper-gallium (Cu-Ga) alloy with a gallium content greater than 22 at. % but not greater than 30.0 at. %, a copper-tin (Cu-Sn) alloy with a tin content greater than 11 at. % but not greater than 21.0 at. %, and a copper-silicon (Cu-Si) alloy with a silicon content greater than 14 at. % but not greater than 21 at. %. 2 claims
[en] A novel principle of approaching an instable phase boundary (IPB) is developed for achieving large magnetostriction in Fe-Ga alloys. Unlike the usual approach by quenching at high temperature, the present Fe81Ga19 alloy was quenched near the decomposition phase boundary (773 K) between A2 and (A2 + L12) after slow cooling to approach the equilibrium condition. The obtained magnetostriction is 120 ppm, 71.4% higher than that of the sample quenched at high temperature (1273 K). The enhanced magnetostriction is due to the lattice softening by quenching near IPB, which may add important insight into developing high-performance magnetostrictive materials.
[en] Time-domain interferometry of synchrotron radiation (TDI) has recently been used as a tool for investigating diffusion in glasses. This work deals with an extension of this technique to ordered structures. In a TDI experiment performed on the B2 alloy CoGa at the APS the intensity scattered into Bragg directions showed no detectable quasielastic signal. Experimental lower limits of the elastic contribution are given. They are in accordance with the coherent scattering function derived in this paper. This result indicates that TDI can be applied to diffusion in crystalline solids, e.g. intermetallic alloys, by using diffuse scattering. Requirements and limitations of diffuse scattering experiments are discussed. (orig.)
[en] The Yb-Ga state diagram was constructed by means of differential and roentgenographical analyses. The existence of YbGa2 and YbGa4 compounds was confirmed. The existence of compounds of the tentative composition YbGa and Yb5Ga3, which decompose by peritectic processes at temperature of 905+-5 and 680+-5 deg C, respectively, was established