MEASUREMENT OF THERMOPHYSICAL PROPERTIES OF AMMONIUM-SALTS IN THE SOLID AND MOLTEN STATES

The thermal conductivity, specific heat capacity and thermal diffusivi ty of solid and molten ammonium thiocyanate, ammonium formate, ammoniu m acetate and ammonium nitrate were measured in the temperature range 80-190 degrees C, including the solid and liquid phases, by using the AC-heated strip (wire) technique. The results indicate that the therma l conductivities depend on the type of the ammonium salt. It was found that the mechanism of heat transfer is due to phonons in the region b elow the melting points of the salts, while above this region the main mechanism is due to conduction.