THERMODYNAMICS OF ALLOYS (CALORIMETRY)
BIRMINGHAM UNIV (ENGLAND)
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The construction of a Sn solution calorimeter designed for the investigation of enthalpies of alloy phase formation is discussed. Construction details, experimental procedure, data treatment, and initial test results are summarized. The apparatus consists of a 1 12 x 2 in. cylindrical Mo crucible which contains 220 g of liquid Sn. The crucible rests on an insulating support, completely surrounded by a Ni plated Cu jacket. The jacket is heated by 3 seriesconnected non-inductive Brightray heating elements wound on a vitreosil tube and 2 elements in alundum discs. Ni radiation shields provide insulation from the rest of the apparatus. Temperature control is accomplished with a saturable reactor proportional controller. Temperature in the bath is measured by a Cu-constantan thermocouple. A water cooled vacuum envelope encloses the calorimeter units allowing measurements under vacuum of 10 to the -5th power mm Hg.