An adiabatic low-temperature calorimeter for small samples

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Abstract
A low-temperature adiabatic microcalorimeter for heat capacity determination was developed. The calorimeter is of the twin type, consisting of a sample cell and thermometric copper block. The temperature of the cell is transferred to the block by a fine thermocouple and a controlling system, and the temperature of the block is measured by standard thermometry. This reduces heat transfer through thermometer leads and thus avoids self-heating due to thermometric current. Heat capacities of two sample cells, one is 0.6 cm3 and the other 1.2 cm3 in the internal volumes, were measured in the temperature range between 13 and 300K with discontinuous heating mode. Accuracy of the calorimeter was tested by a US calorimetry conference standard benzoic acid crystal. The estimated inaccuracy is 1% at 20K, 0.1% at 70K and 0.3% above 170K.

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