Phase segregation in Pb:GeSbTe chalcogenide system

J. Kumar; M. Ahmad; R. Chander; R. Thangaraj; T. S. Sathiaraj

doi:10.1051/epjap:2007173

Phase segregation in Pb:GeSbTe chalcogenide system

J. Kumar, M. Ahmad, R. Chander, R. Thangaraj, T. S. Sathiaraj

Physics & Astronomy

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Effect of Pb substitution on the amorphous-crystalline transformation temperature, optical band gap and crystalline structure of GeSbTe 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 PbGeSbTe, PbGeSbTe, PbGeSbTe and PbGeSbTe 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.

Original language	English
Pages (from-to)	13-18
Number of pages	6
Journal	EPJ Applied Physics
Volume	41
Issue number	1
DOIs	https://doi.org/10.1051/epjap:2007173
Publication status	Published - Jan 2008

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics

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AB - Effect of Pb substitution on the amorphous-crystalline transformation temperature, optical band gap and crystalline structure of GeSbTe 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 PbGeSbTe, PbGeSbTe, PbGeSbTe and PbGeSbTe 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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Phase segregation in Pb:GeSbTe chalcogenide system

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