Evaluation of Sulfosalts
Semi-annual rept. no. 1
WESTINGHOUSE RESEARCH LABS PITTSBURGH PA
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Investigations into phase equilibria relations in the system Tl-V-S show it to be complex, with multiple arrests and supercooling presenting problems in determining composition and melting relationships. The maximum melting composition has not as yet been determined, but it probably does not lie on any pseudobinary join. The best crystals which we have grown have been of nonstoichiometric composition, fractionally richer in Tl and S2. Studies on parameters of crystal growth are proceeding, with work now being performed varying the rate of growth while keeping the composition constant. The material constants and their temperature coefficients have been measured and, with the exception of the piezoelectric constant temperature coefficient, little change is expected in these constants as crystal quality improves. The computer program used to calculate surface wave properties is being re-worked and should be available for use shortly. A SAW filter has been demonstrated on the 001 plane of Tl3VS4.