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Title: Crystallization processes in Ge{sub 2}Sb{sub 2}Se{sub 4}Te glass

Highlights: • Crystallization kinetics of Ge{sub 2}Sb{sub 2}Se{sub 4}Te glass was studied in dependence on particle size by DSC. • All studied fractions were described in terms of the SB autocatalytic model. • Relatively high amount of Te enhances manifestation of bulk crystallization mechanisms. • XRD analysis of samples crystallized under different conditions showed correlation with DSC data. • XRD analysis revealed a new crystallization mechanism indistinguishable by DSC. - Abstract: Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) analysis were used to study crystallization in Ge{sub 2}Sb{sub 2}Se{sub 4}Te glass under non-isothermal conditions as a function of the particle size. The crystallization kinetics was described in terms of the autocatalytic Šesták–Berggren model. An extensive discussion of all aspects of a full-scale kinetic study of a crystallization process was undertaken. Dominance of the crystallization process originating from mechanically induced strains and heterogeneities was confirmed. Substitution of Se by Te was found to enhance the manifestation of the bulk crystallization mechanisms (at the expense of surface crystallization). The XRD analysis showed significant dependence of the crystalline structural parameters on the crystallization conditions (initial particle size of the glassy grains and applied heating rate). Based on this information, a new microstructural crystallizationmore » mechanism, indistinguishable by DSC, was proposed.« less
Authors:
 [1] ;  [2] ;  [3] ;  [1]
  1. Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 573, Pardubice 532 10 (Czech Republic)
  2. Institute of Inorganic Chemistry of the AS CR, v.v.i., Husinec -Rez 25068 Czech Republic (Czech Republic)
  3. Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 573, Pardubice 532 10 (Czech Republic)
Publication Date:
OSTI Identifier:
22420760
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 61; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIMONY TELLURIDES; CALORIMETRY; CORRELATIONS; CRYSTAL STRUCTURE; CRYSTALLIZATION; GERMANIUM SELENIDES; GLASS; HEATING RATE; MICROSTRUCTURE; PARTICLE SIZE; STRAINS; SURFACES; X-RAY DIFFRACTION