The dissociation of liquid silica at high pressure and temperature

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Liquid silica at high pressure and temperature is shown to undergo significant structural modifications and profound changes in its electronic properties. Temperature measurements on shock waves in silica at 70-1000 GPa indicate that the specific heat of liquid SiO{sub 2} rises well above the Dulong-Petit limit, exhibiting a broad peak with temperature that is attributable to the growing structural disorder caused by bond-breaking in the melt. The simultaneous sharp rise in optical reflectivity of liquid SiO{sub 2} indicates that dissociation causes the electrical and therefore thermal conductivities of silica to attain metallic-like values of 1-5 x 10{sup 5} S/m and ... continued below

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8 p. (0.4 MB)

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Hicks, D; Boehly, T; Eggert, J; Miller, J; Celliers, P & Collins, G November 17, 2005.

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Liquid silica at high pressure and temperature is shown to undergo significant structural modifications and profound changes in its electronic properties. Temperature measurements on shock waves in silica at 70-1000 GPa indicate that the specific heat of liquid SiO{sub 2} rises well above the Dulong-Petit limit, exhibiting a broad peak with temperature that is attributable to the growing structural disorder caused by bond-breaking in the melt. The simultaneous sharp rise in optical reflectivity of liquid SiO{sub 2} indicates that dissociation causes the electrical and therefore thermal conductivities of silica to attain metallic-like values of 1-5 x 10{sup 5} S/m and 24-600 W/m.K respectively.

Physical Description

8 p. (0.4 MB)

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PDF-file: 8 pages; size: 0.4 Mbytes

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  • Journal Name: Physical Review Letters, vol. 97, N/A, July 13, 2006, pp. 25502

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  • Report No.: UCRL-JRNL-220603
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 894792
  • Archival Resource Key: ark:/67531/metadc887992

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • November 17, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • April 17, 2017, 1:10 p.m.

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Hicks, D; Boehly, T; Eggert, J; Miller, J; Celliers, P & Collins, G. The dissociation of liquid silica at high pressure and temperature, article, November 17, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc887992/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.