The variation of $T_c$ with composition was investigated for the Mo-Tc system using a quick-quench technique. A transformation of the disordered $A-15$ structure to a bcc structure of the same composition without any change in $T_c$ was observed. This investigation shows that the $T_c$ for a completely disordered $A-15$ lattice is almost identical to the $T_c$ for the bcc or hcp solid solution with the same composition.

• Received 31 May 1977

DOI:https://doi.org/10.1103/PhysRevB.17.2160