HEAT-CAPACITY MEASUREMENTS OF TITANIUM AND OF A HYDRIDE OF TITANIUM FOR TEMPERATURES FROM 4° TO15° K INCLUDING A DETAILED DESCRIPTION OF A SPECIALnADIABATIC SPECIFIC-HEAT CALORIMETER

摘要

An adiabatic specific-beat calorimeter bridging the interval between 4° and 15° K temperatures is described. The instrument uses a constant-volume helium gas thermometer as the working thermometer. The sample is placed directly in the gas-thermometer bulb which thus acts as the sample container. A semiautomatic direct-reading manometer is used for rapid pressure measurements.nBeat-capacity measurements, employing this calorimeter, were made on a sample of 8.0289 gram atoms of high-purity titanium covering the range of 4° to 15° K. Up to about 13° K the data can be represented bynthe equation C = 3.38 * 10-3T + 2.596 * 10-5 T3 where C is heat capacity in Joules per gram atom degree and T is absolute temperature. The average difference between the measured values and those computed from the equation is 1.57 percent.