{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1361699996497378944.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1103/physrevlett.104.025504"}},{"identifier":{"@type":"URI","@value":"http://link.aps.org/article/10.1103/PhysRevLett.104.025504"}},{"identifier":{"@type":"URI","@value":"http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.104.025504/fulltext"}},{"identifier":{"@type":"PMID","@value":"20366609"}}],"dc:title":[{"@value":"Spectroscopic Evidence for Ultrahigh-Pressure Polymorphism in<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:msub><mml:mi>SiO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Glass"}],"description":[{"notation":[{"@value":"Acoustic wave velocities of SiO2 glass were measured up to pressures of 207 GPa using newly developed Brillouin scattering spectroscopic techniques to address the nature of pressure-induced structural changes. The acoustic wave velocity data suggests three distinct pressure regimes, two of which correspond to changes in the Si-O coordination number with pressure, and one of which indicates the stability of sixfold-coordinated Si over a broad pressure interval from approximately 40-140 GPa. An anomalous increase in the effect of pressure on velocity at 140 GPa most likely corresponds to the onset of structural densification associated with an increase in coordination number from sixfold to a higher coordination state."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381699996497378944","@type":"Researcher","foaf:name":[{"@value":"Motohiko Murakami"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699996497378945","@type":"Researcher","foaf:name":[{"@value":"Jay D. Bass"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00319007"},{"@type":"EISSN","@value":"10797114"},{"@type":"PISSN","@value":"http://id.crossref.org/issn/00319007"}],"prism:publicationName":[{"@value":"Physical Review Letters"}],"dc:publisher":[{"@value":"American Physical Society (APS)"}],"prism:publicationDate":"2010-01-15","prism:volume":"104","prism:number":"2","prism:startingPage":"025504"},"reviewed":"false","dc:rights":["http://link.aps.org/licenses/aps-default-license"],"url":[{"@id":"http://link.aps.org/article/10.1103/PhysRevLett.104.025504"},{"@id":"http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.104.025504/fulltext"}],"createdAt":"2010-01-15","modifiedAt":"2025-01-02","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004233600623360","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Higher refractive index and lower wavelength dispersion of 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mathvariant=\"normal\">K</mml:mi><mml:msup><mml:mrow><mml:mi>β</mml:mi></mml:mrow><mml:mrow><mml:mo>′</mml:mo><mml:mo>′</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>\n X-Ray Emission Spectroscopy"}]},{"@id":"https://cir.nii.ac.jp/crid/1360283692790063488","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"High-pressure structural transformation of<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:mrow><mml:msub><mml:mrow><mml:mtext>SiO</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>glass up to 100 GPa"}]},{"@id":"https://cir.nii.ac.jp/crid/1360290617860817536","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Structural changes in aluminosilicate glasses up to 164 GPa and the role of alkali, alkaline earth cations and alumina in the densification mechanism"}]},{"@id":"https://cir.nii.ac.jp/crid/1360290617877358848","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Structural Evolution of \n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mml:msub><mml:mrow><mml:mi>SiO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>\n Glass with Si Coordination Number Greater than 6"}]},{"@id":"https://cir.nii.ac.jp/crid/1360565167085002368","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Evidence of denser MgSiO<sub>3</sub>glass above 133 gigapascal (GPa) and implications for remnants of ultradense silicate melt from a deep magma ocean"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567182088770048","@type":"Article","resourceType":"学術雑誌論文(journal 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