Abstract
The expansion coefficients were measured at 5° intervals from -115°C to -160°C and mean values found from -160°C to -190°C. The upper temperature limit was set by a recrystallization process which set in between -115°C and -110°C. α was found to be larger and to increase more rapidly with the temperature than α. The volume coefficient plotted in conjunction with Carpenter and Oakley's measurements give values of the volume coefficient from the melting point to -160°C where the coefficient apparently begins to decrease rapidly with the temperature.