• T S Mukundan

      Articles written in Pramana – Journal of Physics

    • Low temperature elastic behaviour of As-Sb-Se and Ge-Sb-Se glasses

      E S R Gopal T S Mukundan J Philip S Sathish

      More Details Abstract Fulltext PDF

      The ternary glasses of arsenic and germanium with antimony and selenium can be prepared in large sizes for optical purposes. The elastic behaviour of eight compositions of each glass has been studied down to 4.2 K using a 10 MHz ultrasonic pulse echo interferometer. The glasses have a normal elastic behaviour, with the velocities gradually increasing as the temperature is lowered. An anharmonic solid model of Lakkad satisfactorily explains the temperature variations. The elastic moduli of GexSb10Se90−x glasses increase linearly as the Ge content is increased up to 25 at. % and beyond this the increase is nonlinear. (AsSb)40Se60 glasses show a linear increase in elastic moduli with increasing Sb content. The elastic moduli of AsxSb15Se85−x glasses exhibit a drastic change near the stoichiometric composition As25Sb15Se60. These behaviours have been qualitatively explained on the basis of the structural changes in glasses.

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