The dissociation of liquid silica at high pressure and temperature

Journal Article · Thu Nov 17 00:00:00 EST 2005 · Physical Review Letters, vol. 97, N/A, July 13, 2006, pp. 25502

OSTI ID:894792

Hicks, D; Boehly, T; Eggert, J; Miller, J; Celliers, P; Collins, G

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.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 894792
• Report Number(s): UCRL-JRNL-220603; TRN: US0700318
• Journal Information: Physical Review Letters, vol. 97, N/A, July 13, 2006, pp. 25502, Journal Name: Physical Review Letters, vol. 97, N/A, July 13, 2006, pp. 25502
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DISSOCIATION
MODIFICATIONS
REFLECTIVITY
SHOCK WAVES
SILICA
SPECIFIC HEAT
TEMPERATURE MEASUREMENT