Abstract
A novel high-pressure DTA apparatus was developed for studies on the phase behavior of crystalline materials. It operates under constant hydrostatic pressure up to 200 MPa in the temperature range between 90 and 410 K. Either liquid 3-methylpentane or gaseous helium can alternatively be used as the pressure medium. Test runs on ND 4Br crystal with liquid pressure medium proved satisfactory with respect to stability of the baseline and sensitivity of the signal. Studies on the CH 3NH 3BF 4 crystal, in which a new phase transition was observed, were made with two kinds of pressure media. The influence of pressure and nature of pressure medium on the peak area are described.
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