Intermediate-range order in binary chalcogenide glasses: The first sharp diffraction peak
The structure factor of SiS/sub 2/, SiSe/sub 2/, GeS/sub 2/, and GeSe/sub 2/ glasses, and of GeSe/sub 2/ liquid, have been measured using time-of-flight, pulsed-neutron diffraction. An ubiquitous first sharp diffraction peak (FSDP) appears at /approximately/1 /angstrom//sup /minus/1/ and is a signature of intermediate-range order. In GeSe/sub 2/, the FSDP of the liquid at 1084 K and of the glass at 10 K have the same halfwidth and position in reciprocal space. The origin of the FSDP in these systems is discussed in terms of correlations arising in large ring structures. It is shown that the intensities of the FSDP's scale with coherent scattering from A-A and A-X correlations in the rings (A = Si or Ge; X = S or Se). Departures from simple scaling indicate a change in the ring sizes contributing to the FSDP. 11 refs., 2 figs., 2 tabs.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6360979
- Report Number(s):
- CONF-880726-9; ON: DE89005871
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602* -- Other Materials-- Structure & Phase Studies
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
GERMANIUM COMPOUNDS
GERMANIUM SELENIDES
GERMANIUM SULFIDES
GLASS
NEUTRON DIFFRACTION
SCATTERING
SELENIDES
SELENIUM COMPOUNDS
SILICON COMPOUNDS
SILICON SULFIDES
SULFIDES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION