Abstract
Effect of Pb substitution on the amorphous-crystalline transformation temperature, optical band gap and crystalline structure of Ge 2 Sb 2 Te 5 has been studied. In Pb:GeSbTe chalcogenide films prepared by thermal evaporation, an amorphous to crystallization transition is observed at 124, 129, 136 and 138 °C in Pb 0 Ge 20 Sb 24 Te 56 , Pb 1.6 Ge 19 Sb 26 Te 54 , Pb 3 Ge 17 Sb 28 Te 53 and Pb 5 Ge 12 Sb 28 Te 55 respectively. XRD investigations of annealed samples reveal that Pb substitution retains NaCl type crystalline structure of GST but expands the lattice due to large atomic radii. The increase in amorphous-crystalline transformation temperature is followed with the increase in phase segregation. The optical gap shows marginal variations with composition.
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