Heterogeneous crystallization and composition dependence of optical parameters in Sn-Sb-Bi-Se chalcogenides

Muneer Ahmad, R. Thangaraj, T. Stephen Sathiaraj

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Abstract

Bulk samples of Sn10Sb20-x Bi x Se 70 (0 ≤ x ≤ 8) chalcogenide alloys were prepared by the conventional melt quenching technique. Thin films were prepared on well-cleaned glass substrates by thermal evaporation technique. X-ray diffraction studies revealed that the alloys with x = 0 and 2 at.% of Bi were amorphous, whereas the alloys with x = 4, 6, 8 at.% were crystalline. The crystalline phases are identified as due to the formation of Bi2Se3 and BiSe 2 phases. The microstructural and differential scanning calorimetric studies show the presence of these phases. A simple, straight forward procedure suggested by Swanepoel has been used to calculate the optical parameters, refractive index, and extinction coefficient. The optical gap for all the samples has been obtained from the Tauc plots. The variation in optical parameters for different Bi concentration has been explained on the basis of presence of defect states and the change in stoichiometry with the change in Bi concentration.

Original languageEnglish
Pages (from-to)1231-1236
Number of pages6
JournalJournal of Materials Science
Volume45
Issue number5
DOIs
Publication statusPublished - Mar 1 2010

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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