- For Ba-Cd the calculated alpha (R) for the first c. s. at T equals 800 degree K proved to be 0. 073. Calculations of the temperature dependence in the system Mo-44 at. % W diminish in value for all four c. s. as the temperature rises. The alpha (R) at the first coordination sphere is negative for alloys with mutual solubility, and positive for those with unlimited solubility.