A SIMPLE ADIABATIC LOW-TEMPERATURE CALORIMETER BASED ON A HELIUM REFRIGERATOR SYSTEM

The construction of an adiabatic calorimeter for the 15-300 K range is described. It is fully automated and set up in a helium refrigerator system. The operation of the calorimeter was tested by measuring the s pecific heat capacity of a pure copper sample. The results show good a greement with the standard literature values. The specific heat capaci ty of a magnesium hydride sample was also determined. For MgH2, the st andard molar entropy of S-o(298.15)=30.64 J mol(-1)K(-1) was calculate d from the obtained data. (C) 1998 Elsevier Science B.V.