Quantitative Differential Thermal Analysis at Elevated Pressures
A simple, yet sensitive, form of apparatus for quantitative differential thermal analysis at elevated pressures is described. It has been calibrated and operated satisfactorily at pressures upto 6 Kb and temperatures upto 600 K. It has been used to measure the melting point of indium as a function of pressure upto 6 Kb. The measured values are in good agreement with earlier measurements. For quantitetive measurements, the system has been used to construct phase diagrams for KNO3 and NH4NO3. The dependence of change in enthalpy for a phase transition on pressure has been investigated. The results are in agreement with the results computed from the PVT data.
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