Ternary and quaternary A-15 type compounds, Nb 3 Al 1- y M y (M=Be, B) and (Nb 1- x Ta x ) 3 Al 1- y Ge y , were investigated in the composition range where the A-15 structure was stable. The superconducting critical temperatures of these compounds were measured as a function of composition (x and y), lattice constant, and condition of heat treatment. It was found that the critical temperature is enhanced up to near 20 K by substituting such the quest elements for Al in a stoichiometric compound Nb 3 Al. Magnetic field dependences of the critical current density were also discussed for as-cast and aged samples.
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Kawabe et al. (1973) studied this question.