Abstract
Two different alloys in AgInSbTe system, viz. Ag4In12Sb56Te28 and Ag15In15Sb35Te35 have been synthesized by melt-quench method and analyzed in detail using Rietveld refinement of crystal structure and Raman measurements. Structure refinement has revealed that multi-phase Ag4In12Sb56Te28 has been found to consist of AgIn3Te5, Sb8Te3 and free Sb phases respectively with P-type tetragonal (P4¯2c), 11R (R3¯m) and A7 (R3¯m) structures, while the phases that have been found in Ag15In15Sb35Te35 are AgInTe2, Sb10Te3 and free Sb respectively with chalcopyrite (I4¯2d), 13R (R3¯m) and A7 (R3¯m) structures. By adding suitable amount of Te, the free Sb present in the respective alloys has been converted into Sb8Te3 and Sb10Te3, resulting in, Ag3.54In10.62Sb49.56Te36.28 and Ag14.22In14.22Sb33.17Te38.39 alloys. From these results, two interesting observations have been the presence of AgIn3Te5, and the tendency of coexistence of AgInTe2 and Sb10Te3. The distribution of different phases on the surface of the samples has been identified by combined optical microscopy and Raman spectroscopy, which corroborates the results of Rietveld refinement of crystal structure.
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