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Free keywords:
heat capacity measurement; adiabatic calorimetry; low temperature calorimetry
Abstract:
The paper reviews measuring and data computation procedures in
heat-step calorimetry, for small samples (<100 mg mass) and at
low temperatures (T < 100 K) under semi-adiabatic (isoperibol)
measuring condition. In conjunction with an auto-adaptive heat-
shield control, a method is described how the heat losses,
occurring during an isoperibol measuring cycle, are correctly
taken into account in order to achieve an absolute uncertainty
of C-p of 1% or lower. The basic features of the method are
strictly adiabatic condition at the beginning of each heat
capacity measuring point, achieved by an extremely small
temperature drift of the sample, and a very constant
temperature of the heat-shield during the whole measuring
cycle. (C) 2002 Elsevier Science B.V. All rights reserved.
