The Specific Heat of Molybdenum From 250°C to -40°C

By the use of a long covered tube in the calorimeter proper of an ordinary Richards adiabatic calorimeter, values for the heat capacities of metals from high temperatures may be obtained, even when the falling body is not protected from radiation losses by a metal jacket. The experimental procedure for such a determination is given. A calorimeter arrangement in which the metal was first partially cooled in the calorimeter and then allowed to come in contact with the water of the calorimeter proved unsuitable as is shown. The specific heats of molybdenum between the temperatures of -30°C and 300°C are given by the following equation with an accuracy of about one percent. $C_p=0.0593+0.000013\mathrm{}(T+40\mathrm{})-\frac{0.0265}{{\mathrm{}(T+40\mathrm{})\mathrm{}}^{1.06}}$ Stern's equation, which is linear agrees with the values given between 50°C and 300°C. Below 50°C the curve shows a decided bend.