The OdysseyPub Date : 2019-12-31DOI: 10.1525/9780520966871-030
A. Friedrich, E. Haussühl, W. Morgenroth, A. Lieb, B. Winkler, Karsten Knorrd, W. Schnickc
{"title":"Synopsis","authors":"A. Friedrich, E. Haussühl, W. Morgenroth, A. Lieb, B. Winkler, Karsten Knorrd, W. Schnickc","doi":"10.1525/9780520966871-030","DOIUrl":"https://doi.org/10.1525/9780520966871-030","url":null,"abstract":"The structural compression mechanism of Ce4[Si4O3+xN7-x]Cl1-xOx, x ≈ 0.2, was investigated by in situ single-crystal synchrotron X-ray diffraction at pressures of 3.0, 8.5 and 8.6 GPa using the diamond-anvil cell technique. On increasing pressure the low-pressure cubic structure first undergoes only minor structural changes. Between 8.5 and 8.6 GPa a first-order phase transition occurs, accompanied by a change of the single-crystal colour from light orange to dark red. Unit cell dimensions of a = 10.824(9) Å, b = 10.479(3) Å and c = 8.967(3) Å were found for the high-pressure phase at 8.6 GPa and the structure was solved in space group P212121. The main structural mechanisms, leading to a volume reduction of about 5 % at the phase transition, are an increase in and a rearrangement of the Ce coordination, the loss of the Ce2-Ce3 split position, and a bending of some of the inter-polyhedral Si-N-Si angles in the arrangement of the corner-sharing Si-tetrahedra. The latter is responsible for the short c axis of the orthorhombic high-pressure structure compared to the cell parameter of the cubic low-pressure structure.","PeriodicalId":324433,"journal":{"name":"The Odyssey","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127716592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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