Crystal/glass phase change in KSb5S8 studied through thermal analysis techniques

K. Chrissafis, Theodora Kyratsi, K. M. Paraskevopoulos, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The reversible crystal-glass and glass-crystal transitions discovered in KSb5S8 were studied in detail with nonisothermal scanning calorimetry techniques. When cooled, molten KSb5S8 becomes a metastable glass, which can quantitatively revert to the crystalline form if heated above 277 °C. Crystalline KSb5S8 is a red semiconductor with a band gap of 1.82 eV, whereas the glass (also red) shows a lower but equally well-defined band gap of 1.67 eV. Two approaches have been used to analyze the glass transition. The activation energy of crystallization Ec was calculated using the Kissinger (∼167 ± 3.1 kJ/mol) and Flynn-Wall-Ozawa methods. The kinetic parameters and energy band gaps determined for KSb5S8 suggest possible utility of this system for phase-change, high-density optical data storage applications.

Original languageEnglish
Pages (from-to)1932-1937
Number of pages6
JournalChemistry of Materials
Volume16
Issue number10
DOIs
Publication statusPublished - May 18 2004

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Thermoanalysis
Glass
Crystals
Energy gap
Crystalline materials
Optical data storage
Calorimetry
Crystallization
Kinetic parameters
Kinetic energy
Band structure
Molten materials
Glass transition
Activation energy
Semiconductor materials
Scanning

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

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Crystal/glass phase change in KSb5S8 studied through thermal analysis techniques. / Chrissafis, K.; Kyratsi, Theodora; Paraskevopoulos, K. M.; Kanatzidis, Mercouri G.

In: Chemistry of Materials, Vol. 16, No. 10, 18.05.2004, p. 1932-1937.

Research output: Contribution to journalArticle

Chrissafis, K. ; Kyratsi, Theodora ; Paraskevopoulos, K. M. ; Kanatzidis, Mercouri G. / Crystal/glass phase change in KSb5S8 studied through thermal analysis techniques. In: Chemistry of Materials. 2004 ; Vol. 16, No. 10. pp. 1932-1937.
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