{"@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/1361699994646669824.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.pepi.2008.06.011"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0031920108001271?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0031920108001271?httpAccept=text/plain"}}],"dc:title":[{"@value":"Polymerization and diamond formation from melting methane and their implications in ice layer of giant planets"}],"description":[{"notation":[{"@value":"Abstract   High-pressure and high-temperature experiments of solid methane were performed using a laser-heated diamond anvil cell. X-ray diffractometry and Raman spectroscopy revealed the melting conditions to be above approximately 1100 K in a wide pressure range of 10–80 GPa. Above 1100 K, polymerizations occurred to produce ethane molecules and further polymerized hydrocarbons. Above 3000 K, diamond was produced. These changes proceeded depending on temperature rather than on pressure. The present study provides some experimental supports to theoretical predictions that the middle ice layer of giant planets such as Neptune and Uranus melts into a hot methane-rich ocean, and will help to improve our understanding of the chemical process of the giant planets’ interiors."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381699994646669827","@type":"Researcher","foaf:name":[{"@value":"Hisako Hirai"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699994646669826","@type":"Researcher","foaf:name":[{"@value":"Keisuke Konagai"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699994646669824","@type":"Researcher","foaf:name":[{"@value":"Taro Kawamura"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699994646669825","@type":"Researcher","foaf:name":[{"@value":"Yoshitaka Yamamoto"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699994646669828","@type":"Researcher","foaf:name":[{"@value":"Takehiko Yagi"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00319201"}],"prism:publicationName":[{"@value":"Physics of the Earth and Planetary Interiors"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2009-05","prism:volume":"174","prism:number":"1-4","prism:startingPage":"242","prism:endingPage":"246"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S0031920108001271?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S0031920108001271?httpAccept=text/plain"}],"createdAt":"2008-06-28","modifiedAt":"2018-12-27","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004231198734848","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Preferential dissolution of SiO2 from enstatite to H2 fluid under high pressure and 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conditions"}]},{"@id":"https://cir.nii.ac.jp/crid/1360565165243390976","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Reaction of forsterite with hydrogen molecules at high pressure and temperature"}]},{"@id":"https://cir.nii.ac.jp/crid/1360580229795932672","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Effect of Pressure on the Thermal Cracking and Polymerization of Pentacosane (<i>n</i>-C<sub>25</sub>), an <i>n</i>-Alkane"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848658401545344","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Formation of diamonds in laser-compressed hydrocarbons at planetary interior conditions"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848658844474624","@type":"Article","resourceType":"学術雑誌論文(journal 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スイテイ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681503332480","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"From carbon materials to gas hydrates: High-pressure properties of gas hydrates and solid methane in the icy planets and their moon"},{"@language":"ja","@value":"炭素からハイドレートへ　　　そして惑星衛星のハイドレート，氷メタンの高圧物性"},{"@value":"日本鉱物科学会賞 受賞記念研究紹介 炭素からハイドレートへ そして惑星衛星のハイドレート,氷メタンの高圧物性"},{"@language":"ja-Kana","@value":"ニホン コウブツ カガクカイショウ ジュショウ キネン ケンキュウ ショウカイ タンソ カラ ハイドレート エ ソシテ ワクセイ エイセイ ノ ハイドレート コオリ メタン ノ コウアツ ブッセイ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390848250109867008","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Chemical reaction of the reduced carbon and hydrogen species and effect on phase relation of the silicate minerals under the interior of the 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