{"@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/1361418519913301504.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1007/s00269-006-0126-6"}},{"identifier":{"@type":"URI","@value":"http://link.springer.com/content/pdf/10.1007/s00269-006-0126-6.pdf"}},{"identifier":{"@type":"URI","@value":"http://link.springer.com/article/10.1007/s00269-006-0126-6/fulltext.html"}},{"identifier":{"@type":"URI","@value":"http://link.springer.com/content/pdf/10.1007/s00269-006-0126-6"}}],"dc:title":[{"@value":"Raman spectra of methane hydrate up to 86 GPa"}],"description":[{"notation":[{"@value":"High-pressure Raman studies of methane hydrate were performed using a diamond anvil cell in the pressure range of 0.1–86 GPa at room temperature. Raman spectra of the methane molecules revealed that new softened intramolecular vibration mode of ν                 1 appeared at 17 GPa and that the splitting of vibration mode of ν                 3 occurred at 15 GPa. The appearance of these two modes indicates that an intermolecular attractive interaction increases between the methane molecules and the host water molecules and between the neighboring methane molecules. These interactions might result in the exceptional stability of a high-pressure structure, a filled ice Ih structure (FIIhS) for methane hydrate, up to 40 GPa. At 40 GPa, a clear change in the slope of the Raman shift versus pressure occurred, and above 40 GPa the Raman shift of the vibration modes increased monotonously up to 86 GPa. A previous XRD study showed that the FIIhS transformed into another new high-pressure structure at 40 GPa. The change in the Raman spectra at 40 GPa may be induced by the transition of the structure."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381418519913301632","@type":"Researcher","foaf:name":[{"@value":"Shin-Ichi Machida"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418519913301504","@type":"Researcher","foaf:name":[{"@value":"Hisako Hirai"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418519913301506","@type":"Researcher","foaf:name":[{"@value":"Taro Kawamura"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418519913301507","@type":"Researcher","foaf:name":[{"@value":"Yoshitaka Yamamoto"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418519913301505","@type":"Researcher","foaf:name":[{"@value":"Takehiko Yagi"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"03421791"},{"@type":"EISSN","@value":"14322021"}],"prism:publicationName":[{"@value":"Physics and Chemistry of Minerals"}],"dc:publisher":[{"@value":"Springer Science and Business Media LLC"}],"prism:publicationDate":"2006-12-01","prism:volume":"34","prism:number":"1","prism:startingPage":"31","prism:endingPage":"35"},"reviewed":"false","dc:rights":["http://www.springer.com/tdm"],"url":[{"@id":"http://link.springer.com/content/pdf/10.1007/s00269-006-0126-6.pdf"},{"@id":"http://link.springer.com/article/10.1007/s00269-006-0126-6/fulltext.html"},{"@id":"http://link.springer.com/content/pdf/10.1007/s00269-006-0126-6"}],"createdAt":"2006-11-30","modifiedAt":"2019-05-24","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004234444449792","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Structural changes and intermolecular interactions of filled ice Ic structure for hydrogen hydrate under high pressure"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004234447124096","@type":"Article","resourceType":"学術雑誌論文(journal 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temperature"}]},{"@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/1390295270228622976","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Crystal structures of gas hydrates ─ Relation of guest molecules and cage structures ─"},{"@language":"ja","@value":"ガスハイドレートの結晶構造 ─ゲスト分子とケージ構造の相関関係の検討─"}]},{"@id":"https://cir.nii.ac.jp/crid/2051151842066367232","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Significance of the high-pressure properties and structural evolution of gas hydrates for inferring the interior of icy 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