INVESTIGATION OF EQUILIBRIUM PARTIAL PRESSURES OVER (HG1-XCDX)(Y)TE-1-Y (Y-LESS-THAN-0.5) MELTS

A double optical path system was designed for the optical absorbance m easurement. The equilibrium partial pressures of Hg and Te-2 over the (Hg1-xCdx)(y)Te-1-y (y < 0.5) melts with x = 0.13-0.55 and y = 0.21-0. 41 between 500 and 750 degrees C were determined by this method. The e xperimental results were reproducible and the errors were estimated as about 5%. The data achieved show that p(Hg) increases with the rise o f y when T and x remain unchanged, and decreases slightly with the inc rease of x when T and y are kept constant. The cause of these phenomen a is discussed.