Analysis of the lumped τ2 effect in relaxation calorimetry
- 1 February 1985
- journal article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 56 (2) , 273-277
- https://doi.org/10.1063/1.1138343
Abstract
In thermal relaxation calorimetry, the heat capacity can be calculated from the time constant τ1=Cp/Kb of the exponential decay of the cooling curve. If the thermal bond between the sample and sample holder is poor, the cooling curve is described by T−T0=A1 exp(−t/τ1)+A2 exp(−t/τ2). Analysis shows that the heat capacity of the sample plus addenda is Cp=Kb (A1τ1+A2τ2)/(A1+A2). For most cases, a good approximation is given by Cp=Kb (A1τ1/ΔT), which does not require the measurement of A2 or τ2. An expression is presented for calculating the conductance of the thermal bond of the sample to the substrate.Keywords
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