Solid solutions between the compounds Nb3A1, Nb3Ga, NbsGe, Nb3In, and Nb3Sn have been prepared by arc melting in argon atmosphere. Transitions to superconductivity, lattice constants and values of microhardness have been measured for all samples as cast as well as annealed. In agreement with MATTmAS et al. the highest transition to superconductivity at 20.05 ~ has been observed in the system Nb 3 (All_xGex). A relation between microhardness and transition to superconductivity also expressed by MATTmAS has been verified for most of the systems.
The energy of a converging shock wave has been used to form the intermetallic compound Nb3Sn from its elemental powders. A reaction pattern indicative of compound formation is observed when a critical shock pressure is exceeded. The compound is obtained in a ``pressure-temperature quenched state'' and exhibits a transition temperature to superconductivity of 16.3°K.
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