Topological Transformations in Chalcogenide Glasses

Abstract

We have studied the structure of amorphous Ge1-xSnxSe2 and its photoinduced transformations using Raman and Mossbauer spectroscopies, ellipsometry, optical absorption, and a variety of other techniques. We find that the glass consists of two types of distinct structural units with distinct responses to pressure, and that the Sn atoms preferentially occupy tetrahedral sites at the edges of one of these units. As the Sn concentration is increased the size of the units decreases to provide more edge sites. These structural changes resulting from the addition of Sn cause a decrease in the optical band gap and a suppression of the photodarkening response.

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Document Details

Document Type
Technical Report
Publication Date
Feb 14, 1992
Accession Number
ADA248442

Entities

People

  • Laurie E. Mcneil

Organizations

  • University of North Carolina at Chapel Hill

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Band Gaps
  • Diffraction
  • Electron Density
  • Electrons
  • Energy Bands
  • Free Electrons
  • High Pressure
  • Materials
  • Military Research
  • Optical Absorption
  • Optical Materials
  • Optical Properties
  • Phase Separation
  • Refraction
  • Refractive Index
  • Spectroscopy
  • Students

Fields of Study

  • Materials science
  • Physics

Readers

  • Graph Algorithms and Convex Optimization.
  • Materials Science and Engineering.