A theoretical analysis has been done on some physical parameters like electro–negativity, average coordination number, glass transition temperature etc. which plays an important role in the glass formation and stability of glassy alloys. These parameters are calculated for Ge–Bi–Se amorphous system with variation in Bi content. The Ge–Bi–Se system, with two combinations viz: Ge10BixSe90-x and Ge20BixSe80-x (x = 3, 6, 9, 12, 15 atomic %), is found to be in accordance with the earlier researches. The addition of Bi to Ge-Se glassy alloys supposed to vary linearly the whole category of physical properties. During studies to develop a material combination useful for phase change optical recording, smooth linear changes were observed with increase in Bi content.
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