Structural and Dynamic Characterization of Amorphous Solids and Associated Phase Transitions. Final Report

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Description

The effect of hydrostatic pressure on the structure of glasses is not well understood. There is extensive evidence now indicating that glasses undergo structural transformation upon application of pressure. These transformations are usually evidenced by changes in density, sound velocity, and structural changes from diffraction measurements (x-ray and neutron). In vitreous GeO{sub 2}, a change in Ge-coordination from 4-6 is evidenced on the application of pressure. The coordination change reverts back to 4 on releasing the pressure indicating that the structural transformation is reversible with pressure. But a shift towards higher Q (inverse space) of the first sharp diffraction peak ... continued below

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8 pages

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Yarger, J. L. August 15, 2000.

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Description

The effect of hydrostatic pressure on the structure of glasses is not well understood. There is extensive evidence now indicating that glasses undergo structural transformation upon application of pressure. These transformations are usually evidenced by changes in density, sound velocity, and structural changes from diffraction measurements (x-ray and neutron). In vitreous GeO{sub 2}, a change in Ge-coordination from 4-6 is evidenced on the application of pressure. The coordination change reverts back to 4 on releasing the pressure indicating that the structural transformation is reversible with pressure. But a shift towards higher Q (inverse space) of the first sharp diffraction peak (FSDP) on the pressure compacted v-SiO{sub 2} and v-GeO{sub 2} suggests that application of pressure has both reversible and irreversible components such that on the release of pressure, the glass remains in a permanently compacted state.

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8 pages

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OSTI as DE00825016

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  • Other Information: PBD: 15 Aug 2000

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  • Report No.: None
  • Grant Number: FG02-00ER45836
  • DOI: 10.2172/825016 | External Link
  • Office of Scientific & Technical Information Report Number: 825016
  • Archival Resource Key: ark:/67531/metadc786741

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • August 15, 2000

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • Aug. 4, 2016, 7:55 p.m.

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Yarger, J. L. Structural and Dynamic Characterization of Amorphous Solids and Associated Phase Transitions. Final Report, report, August 15, 2000; United States. (digital.library.unt.edu/ark:/67531/metadc786741/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.