Mass Spectrometric Study of the Phase Boundaries of the CdS-CdTe System

An isothermal evaporation method by means of a Knudsen cell-mass pectrometer combination has been applied to the determination of the phase boundaries in the CdS-CdTe system in the temperature ange of 650~176 The phase boundaries obtained in the present study were compared with published phase boundaries. The advantages ofthe present method over the x-ray diffraction technique are discussed, The advantages of applying the isothermal evaporation method by means of a Knudsen cell-mass pectrometer combination to the thermodynamic study of molten salt mixtures have been discussed by Sidrov et al. (1, 2). Ion in-tensity measured by a mass spectrometer is directly pro-portional to the activity of a component in a solution. Since the changes in activities during the isothermal ev-poration reflect the phase changes, the phase boundary can be determined by measuring the change of ion intensi-ties as a function of composition. In the isothermal evapo