AlexSys
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ALEXSYS High Temperature Calvet Calorimeter by Setaram A trademark of KEP Technologies group

ALEXSYS The AlexSys is a high-sensitivity Calvet calorimeter optimized for high temperature solution calorimetry in molten solvents at temperatures to 1000 °C. It is run isothermally to study heats of formation, reaction, and mixing. Transposed temperature drop calorimetry can also be performed to measure heat content, heats of phase transition and decomposition. The AlexSys is based on Prof. Alexandra Navrotsky’s (University of California - Davis) High Temperature Calorimeter which has many years of development, use, and application. HIGHLIGHTS include: • ensitivity, stability, flexibility...

PRINCIPLE The AlexSys is based on a differential 3D Calvet sensor made of an array of thermocouples (thermopile) which completely surrounds the measuring zone and is connected to a constant temperature block. This design captures over 90% of the heat flow in or out of the sample. The system is twinned (two thermopiles per calorimeter) for additional signal stability and greater experimental throughput. The calorimeter is calibrated using a drop method in which a sapphire pellet (or other calibrant) is dropped into an assembly similar to that used for the experiment. Such calibration can be...

The unique feature of this calorimeter is a large sample chamber in which one can carry out chemical reactions at high temperature. Applications include drop solution calorimetry with gas flow above the sample and/or gas bubbling through the molten solvent, direct reaction calorimetry to form alloys and compounds, aluminothermic and other oxidation-reduction reactions, gas-solid, gas-liquid, and liquid-liquid reactions. More specifically, the instrument permits the measurement of the energetics of crystalline oxides, glasses, amorphous, and nanophase and porous materials, of hydrous phases...