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dc.contributor.author Ahmad, M.
dc.contributor.author Thangaraj, R.
dc.contributor.author Sathiaraj, T.S.
dc.date.accessioned 2011-03-15T10:19:12Z
dc.date.available 2011-03-15T10:19:12Z
dc.date.issued 2010
dc.identifier.citation Ahmad, M. et al (2010) Heterogeneous crystallization and composition dependence of optical parameters in Sn–Sb–Bi–Se chalcogenides, J Mater Sci, Vol. 45, pp. 1231-1236 en_US
dc.identifier.uri http://hdl.handle.net/10311/752
dc.description some symbols on the abstract may not appear as they are on the text. en_US
dc.description.abstract Bulk samples of Sn10Sb20-xBixSe70 (0 B x B 8) chalcogenide alloys were prepared by the conventional melt quenching technique. Thin films were prepared on wellcleaned 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 BiSe2 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. en_US
dc.language.iso en en_US
dc.publisher Springer en_US
dc.subject Heterogeneous crystallization en_US
dc.subject Optical parameters en_US
dc.title Heterogeneous crystallization and composition dependence of optical parameters in Sn–Sb–Bi–Se chalcogenides en_US
dc.type Published Article en_US


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