Adiabatic heat capacity calorimeter was designed and constructed at the Institute of Nuclear Physics. The device allows for most accurate measurement of the absolute value of heat capacity in wide range of temperatures for liquid and solid samples. Under adiabatic conditions, defined amount of energy supplied to the sample, induces temperature increment, which is precisely measured. The adiabatic condition is realized with help of adiabatic and outer shields, kept at regulated temperature and enclosing the sample container placed in high vacuum of about 10-5 mbar. A temperature difference between sample container and shields is detected with set of thermocouples. The system is placed in liquid helium cryostat.
| Temperature range: | -196 to 25 °C |
| Sensitivity: | < 10 μK |
| Precision of temperature measurement: | ± 0.0001 °C |
| Required amount of sample: | ~7 ml |
Anomalies, observed on the heat capacity vs temperature experimental curve, are evidence of phase transitions occurring in the studied substance. Several thermodynamic quantities (enthalpy, Gibbs energy, entropy) characterizing observed phase modifications can be studied in wide range of temperatures.
