Thermochimica Acta, Vol.237, No.1, 133-141, 1994
A Differential Thermal-Analysis (DTA) Apparatus for the Investigation of Liquid-Crystalline Compounds at High-Pressures
A DTA apparatus is presented for the temperature range 300-600 K, and up to 1 GPa pressure. It was designed for the investigation of liquid crystals but can also be used for other substances. The heater is wound directly on the DTA measuring head within the high-pressure gas chamber. The sample is hermetically encapsulated in an upside-down small glass bulb which is completely submerged in a metallic liquid. This new kind of sample encapsulation enables a completely hysteresis-free pressure transmission and an absolute protection of the substance from contamination by the pressure medium in a DTA measuring head.