Study of crystallization kinetics and structural relaxation behavior in phase separated Ag 33Ge 17Se 50 glassy alloys

Praveen Kumar, S. N. Yannopoulos, T. S. Sathiaraj, R. Thangaraj

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We report on the crystallization processes and structure (crystal phases) of Ag 33Ge 17Se 50 glassy alloy using differential scanning calorimetry and x-ray diffraction techniques, respectively. The devitrification that gives rise to the first exothermic peak results in the crystallization of Ag 2Se and Ag 8GeSe 6 phases, while the growth of GeSe 2 accompanied by the transformation of Ag 8GeSe 6 to Ag 2Se phase occurs during the second crystallization process. Different theoretical models are used to elucidate various kinetic parameters for the crystallization transformation process in this phase separated system. With annealing below the glass transition temperature, an inverse behavior between the variation of the optical gap and the band tailing parameter is observed for the thermally evaporated films. These results are explained as the mixing of different clusters/species in the amorphous state and/or changes caused by structural relaxation of the glassy network for the thermally evaporated films.

Original languageEnglish
Pages (from-to)68-72
Number of pages5
JournalMaterials Chemistry and Physics
Volume135
Issue number1
DOIs
Publication statusPublished - Jul 16 2012

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Structural relaxation
Crystallization kinetics
Crystallization
crystallization
kinetics
Tailings
Kinetic parameters
Differential scanning calorimetry
Diffraction
Crystal structure
glass transition temperature
Annealing
x ray diffraction
X rays
heat measurement
crystal structure
annealing
scanning

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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abstract = "We report on the crystallization processes and structure (crystal phases) of Ag 33Ge 17Se 50 glassy alloy using differential scanning calorimetry and x-ray diffraction techniques, respectively. The devitrification that gives rise to the first exothermic peak results in the crystallization of Ag 2Se and Ag 8GeSe 6 phases, while the growth of GeSe 2 accompanied by the transformation of Ag 8GeSe 6 to Ag 2Se phase occurs during the second crystallization process. Different theoretical models are used to elucidate various kinetic parameters for the crystallization transformation process in this phase separated system. With annealing below the glass transition temperature, an inverse behavior between the variation of the optical gap and the band tailing parameter is observed for the thermally evaporated films. These results are explained as the mixing of different clusters/species in the amorphous state and/or changes caused by structural relaxation of the glassy network for the thermally evaporated films.",
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Study of crystallization kinetics and structural relaxation behavior in phase separated Ag 33Ge 17Se 50 glassy alloys. / Kumar, Praveen; Yannopoulos, S. N.; Sathiaraj, T. S.; Thangaraj, R.

In: Materials Chemistry and Physics, Vol. 135, No. 1, 16.07.2012, p. 68-72.

Research output: Contribution to journalArticle

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