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dc.contributor.authorLiu, Hanyuen_US
dc.contributor.authorTse, John S.en_US
dc.contributor.authorNellis, W. J.en_US
dc.date.accessioned2015-09-01T13:27:43Z
dc.date.issued2015en_US
dc.identifier.citationLiu, Hanyu, John S. Tse, and W. J. Nellis. 2015. “The electrical conductivity of Al2O3 under shock-compression.” Scientific Reports 5 (1): 12823. doi:10.1038/srep12823. http://dx.doi.org/10.1038/srep12823.en
dc.identifier.issn2045-2322en
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:21461755
dc.description.abstractSapphire (Al2O3) crystals are used below 100 GPa as anvils and windows in dynamic-compression experiments because of their transparency and high density. Above 100 GPa shock pressures, sapphire becomes opaque and electrically conducting because of shock-induced defects. Such effects prevent temperature and dc conductivity measurements of materials compressed quasi-isentropically. Opacities and electrical conductivities at ~100 GPa are non-equilibrium, rather than thermodynamic parameters. We have performed electronic structure calculations as a guide in predicting and interpreting shock experiments and possibly to discover a window up to ~200 GPa. Our calculations indicate shocked sapphire does not metallize by band overlap at ~300 GPa, as suggested previously by measured non-equilibrium data. Shock-compressed Al2O3 melts to a metallic liquid at ~500 GPa and 10,000 K and its conductivity increases rapidly to ~2000 Ω−1cm−1 at ~900 GPa. At these high shock temperatures and pressures sapphire is in thermal equilibrium. Calculated conductivity of Al2O3 is similar to those measured for metallic fluid H, N, O, Rb, and Cs. Despite different materials, pressures and temperatures, and compression techniques, both experimental and theoretical, conductivities of all these poor metals reach a common end state typical of strong-scattering disordered materials.en
dc.language.isoen_USen
dc.publisherNature Publishing Groupen
dc.relation.isversionofdoi:10.1038/srep12823en
dc.relation.hasversionhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC4523845/pdf/en
dash.licenseLAAen_US
dc.titleThe electrical conductivity of Al2O3 under shock-compressionen
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden
dc.relation.journalScientific Reportsen
dc.date.available2015-09-01T13:27:43Z
dc.identifier.doi10.1038/srep12823*


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