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Title: Medium range order and structural relaxation in As–Se network glasses through FSDP analysis

We performed synchrotron X-ray diffraction and neutron scattering studies on As-Se glasses in two states: as-prepared (rejuvenated) and aged for similar to 27 years. The first sharp diffraction peak (FSDP) obtained from the structure factor data as a function of composition and temperature indicates that the cooperative processes that are responsible for structural relaxation do not affect FSDP. The results are correlated with the composition dependence of the complex heat capacity of the glasses and concentration of different structural fragments in the glass network. Furthermore, the comparison of structural information shows that density fluctuations, which were thought previously to have a significant contribution to FSDP, have much smaller effect than the cation-cation correlations, presence of ordered structural fragments or cage molecules.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3] ;  [4] ;  [5] ;  [5] ;  [3]
  1. Austin Peay State Univ., Clarksville, TN (United States). Dept. of Physics and Astronomy
  2. Univ. of Arizona, Tucson, AZ (United States). Dept. of Materials Science and Engineering
  3. Lehigh Univ., Bethlehem, PA (United States). Dept. of Materials Science and Engineering
  4. Jan Dlugosz Univ. of Czestochowa (Poland). Inst. of Physics
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Materials Chemistry and Physics
Additional Journal Information:
Journal Volume: 153; Journal Issue: C; Journal ID: ISSN 0254-0584
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 36 MATERIALS SCIENCE; Glasses; Powder diffraction; Neutron scattering and diffraction; Glass transitions; SHARP DIFFRACTION PEAK; TEMPERATURE-DEPENDENCE; NEUTRON-DIFFRACTION; CRYSTAL-STRUCTURE; VITREOUS SILICA; AS2SE3; TRANSITION; SOLIDS; GESE2
OSTI Identifier:
1334441
Alternate Identifier(s):
OSTI ID: 1247752