{"@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/1362825895010189056.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.2138/am-2001-11-1219"}}],"dc:title":[{"@value":"The crystal structure of low melanophlogite"}],"description":[{"notation":[{"@value":"The crystal structure of the low temperature form of natural melanophlogite, 46SiO 2  · 6M 14  · 2M 12  (M 14  = N 2 , CO 2 ; M 12  = CH 4 , N 2 ), was determined using single-crystal X-ray diffraction data at room temperature. The structure is tetragonal with space group  P 4 2 / nbc  and unit cell  a  = 26.818(2) and  c  = 13.365(1) A, which is the (2 ×2 × 1) superstructure of high-temperature cubic melanophlogite and includes four formula units. The structure with 335 variable parameters including anisotropic temperature factors (or atomic displacement factors) was refined to  R  = 0.0288 for 2706 observed reflections. The main silica framework consists of nearly regular SiO 4  tetrahedra forming large internal voids represented by distorted tetrakaidecahedra and pentagondodecahedra, which accommodate CO 2  or N 2  and CH 4  or N 2  guest molecules, respectively.  This low temperature form is a displacive variant of the cubic high-temperature form. The mean bond length is 1.588(4) A for Si-O, and the bond angles for Si-O-Si are distributed over a large range from about 145 to 171° with a mean value of 159.4(3)°. The thermal vibrations of Si are nearly isotropic with amplitudes approximately equal to the average mean square displacement of 0.0119(4) A 2 . The thermal vibrations of the O atoms are highly anisotropic with a wide range of mean square displacements. There is a positive correlation between the Si-O-Si bond angles and the mean-square displacements of the O atoms."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1382825895010189056","@type":"Researcher","foaf:name":[{"@value":"Takeshi Nakagawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825895010189057","@type":"Researcher","foaf:name":[{"@value":"Kuniaki Kihara"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825895010189058","@type":"Researcher","foaf:name":[{"@value":"Kazuo Harada"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"0003004X"},{"@type":"PISSN","@value":"http://id.crossref.org/issn/0003004X"},{"@type":"PISSN","@value":"https://id.crossref.org/issn/0003004X"}],"prism:publicationName":[{"@value":"American Mineralogist"}],"dc:publisher":[{"@value":"Mineralogical Society of America"}],"prism:publicationDate":"2001-11","prism:volume":"86","prism:number":"11-12","prism:startingPage":"1506","prism:endingPage":"1512"},"reviewed":"false","createdAt":"2015-09-24","modifiedAt":"2021-03-04","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050845760724278144","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Comparison of thermodynamic stabilities and mechanical properties of CO[2], SiO[2], and GeO[2] polymorphs by first-principles calculations"}]},{"@id":"https://cir.nii.ac.jp/crid/1360009142544733824","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Bosoite, a new silica clathrate mineral from Chiba Prefecture, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567184368464512","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Clathrate compounds of silica"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848660015521408","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"The hydrocarbon-bearing clathrasil chibaite and its host–guest structure at low temperature"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206525787904","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"SiO2 polymorphs and structure transitions."},{"@language":"ja","@value":"ＳｉＯ２多形と構造転移"},{"@language":"ja-Kana","@value":"SiO2 タケイ ト コウゾウ テンイ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206545593472","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"X-ray studies of structural changes in melanophlogite with varying temperature"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681523699840","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Higher-order thermal motion tensor analysis and atom disorder in cubic melanophlogite"}]},{"@id":"https://cir.nii.ac.jp/crid/1390845713082609536","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"High–temperature Raman spectroscopic study of CO<sub>2</sub>–containing melanophlogite"}]},{"@id":"https://cir.nii.ac.jp/crid/1391694356246877824","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"CO<sub>2</sub> distribution in CO<sub>2</sub>–rich melanophlogite from Fortunillo, Tuscany, Italy"}]},{"@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 bodies"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.2138/am-2001-11-1219"},{"@type":"OPENAIRE","@value":"doi_dedup___::b1accee9576d2c24ca353c5e6c5bef5e"},{"@type":"CROSSREF","@value":"10.1063/1.4735077_references_DOI_WrIiDJGylFlIQyCv2Mzyne3EWuv"},{"@type":"CROSSREF","@value":"10.2465/jmps.101.14_references_DOI_WrIiDJGylFlIQyCv2Mzyne3EWuv"},{"@type":"CROSSREF","@value":"10.1180/mgm.2020.91_references_DOI_WrIiDJGylFlIQyCv2Mzyne3EWuv"},{"@type":"CROSSREF","@value":"10.1088/0953-8984/26/10/103203_references_DOI_WrIiDJGylFlIQyCv2Mzyne3EWuv"},{"@type":"CROSSREF","@value":"10.2465/gkk.31.38_references_DOI_WrIiDJGylFlIQyCv2Mzyne3EWuv"},{"@type":"CROSSREF","@value":"10.1186/s40645-023-00534-6_references_DOI_WrIiDJGylFlIQyCv2Mzyne3EWuv"},{"@type":"CROSSREF","@value":"10.1107/s2052252518009107_references_DOI_WrIiDJGylFlIQyCv2Mzyne3EWuv"},{"@type":"CROSSREF","@value":"10.2465/jmps.100.247_references_DOI_WrIiDJGylFlIQyCv2Mzyne3EWuv"},{"@type":"CROSSREF","@value":"10.2465/jmps.180912_references_DOI_WrIiDJGylFlIQyCv2Mzyne3EWuv"},{"@type":"CROSSREF","@value":"10.2465/jmps.200611_references_DOI_WrIiDJGylFlIQyCv2Mzyne3EWuv"}]}