{"@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/1362825895010449152.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2002gl016722"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2002GL016722"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2002GL016722"}}],"dc:title":[{"@value":"Stability of CaCl<sub>2</sub>‐type and α‐PbO<sub>2</sub>‐type SiO<sub>2</sub> at high pressure and temperature determined by in‐situ X‐ray measurements"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>Here we report the phase boundary between CaCl<jats:sub>2</jats:sub>‐type and α‐PbO<jats:sub>2</jats:sub>‐type silica at high pressure and temperature up to 151 GPa and 2500‐K determined by in‐situ X‐ray measurements in a laser‐heated diamond anvil cell. Amorphous silica was used as starting material, and the sample was heated for more than 1.5 hr to examine the kinetic effects. The results demonstrated that the CaCl<jats:sub>2</jats:sub>‐type silica is a post‐stishovite phase and that it undergoes further transition to the α‐PbO<jats:sub>2</jats:sub>‐type structure above 121 GPa at 2400‐K. Present data together with previous first‐principles calculations indicate that the phase boundary between CaCl<jats:sub>2</jats:sub>‐type and α‐PbO<jats:sub>2</jats:sub>‐type silica is represented by a linear equation P (GPa) = 98 + (0.0095 ± 0.0016) * T (K). The α‐PbO<jats:sub>2</jats:sub>‐type silica can be present in the deep portion of the lower mantle in the silica‐saturated bulk compositions. This phase transition might contribute to the seismic wave velocity anomalies observed in the D″ region.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1382825895010449152","@type":"Researcher","foaf:name":[{"@value":"Motohiko Murakami"}],"jpcoar:affiliationName":[{"@value":"Department of Earth and Planetary Sciences Tokyo Institute of Technology  Tokyo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825895010449155","@type":"Researcher","foaf:name":[{"@value":"Kei Hirose"}],"jpcoar:affiliationName":[{"@value":"Department of Earth and Planetary Sciences Tokyo Institute of Technology  Tokyo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825895010449153","@type":"Researcher","foaf:name":[{"@value":"Shigeaki Ono"}],"jpcoar:affiliationName":[{"@value":"Institute for Frontier Research on Earth Evolution Japan Marine Science and Technology Center  Kanagawa Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825895010449154","@type":"Researcher","foaf:name":[{"@value":"Yasuo Ohishi"}],"jpcoar:affiliationName":[{"@value":"Japan Synchrotron Radiation Research Institute  Hyogo Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00948276"},{"@type":"EISSN","@value":"19448007"}],"prism:publicationName":[{"@value":"Geophysical Research Letters"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2003-03","prism:volume":"30","prism:number":"5","prism:startingPage":"1207"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2002GL016722"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2002GL016722"}],"createdAt":"2003-05-23","modifiedAt":"2023-10-31","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004231198522752","@type":"Article","resourceType":"学術雑誌論文(journal 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