{"@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/1361699993668867328.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1002/jctb.5010150304"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjctb.5010150304"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1002/jctb.5010150304"}}],"dc:title":[{"@value":"The oxidation of uranium dioxides"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>The oxidation of three types of uranium dioxide (UO<jats:sub>2</jats:sub>) material has been investigated in the 120—360° range.</jats:p><jats:p>In UO<jats:sub>2</jats:sub> powders, of surface area greater than about 2 m.<jats:sup>2</jats:sup>/g., oxidation was diffusion‐controlled up to U<jats:sub>3</jats:sub>O<jats:sub>7</jats:sub> which oxidised to U<jats:sub>3</jats:sub>O<jats:sub>8</jats:sub> above about 240°. The activation energies were in the range 20—27 kcal./mole.</jats:p><jats:p>For material with very low surface‐area, both electrolytic UO<jats:sub>2</jats:sub> powder (0.0405 m.<jats:sup>2</jats:sup>/g.) and sintered pellets (5 cm.<jats:sup>2</jats:sup>g.) were oxidised by nucleation and growth controlled processes. The growth activation energies for the two materials were 32.19 and 26.38 kcal./mole respectively. Considerable differences occurred in the oxidation rate of pellets from batch to batch.</jats:p><jats:p>Material with intermediate surface‐area comprising sintered powder (0.135 m.<jats:sup>2</jats:sup>/g.) and crushed sintered pellets (0.095 m.<jats:sup>2</jats:sup>/g.) gave oxidation curves which were hybrid between the other two types above. At a high enough temperature (∼ 420°), the 0.095 m.<jats:sup>2</jats:sup>/g. material showed a completely sigmoid ‘nucleation’ type of curve.</jats:p><jats:p><jats:italic>X</jats:italic>‐Ray diffraction studies were performed at intermediary stages in the oxidations to trace the presence of the γ‐UO<jats:sub>2</jats:sub> phase, and suggestions are put forward to explain the above differences in behaviour.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381699993668867328","@type":"Researcher","foaf:name":[{"@value":"D. E. Y. Walker"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00218871"},{"@type":"EISSN","@value":"1934998X"}],"prism:publicationName":[{"@value":"Journal of Applied Chemistry"}],"dc:publisher":[{"@value":"Wiley"}],"prism:publicationDate":"1965-03","prism:volume":"15","prism:number":"3","prism:startingPage":"128","prism:endingPage":"135"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjctb.5010150304"},{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1002/jctb.5010150304"}],"createdAt":"2010-07-06","modifiedAt":"2023-10-19","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360283694075472896","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"The Use of Carbon Monoxide in Low-temperature Sintering of High-density UO2 Pellets"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1002/jctb.5010150304"},{"@type":"CROSSREF","@value":"10.1246/bcsj.41.225_references_DOI_Fs6L2AZvjLQiGtCWeg7K1xDZKaM"}]}