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DOI | 10.1038/s41467-018-05308-z |
Metastable silica high pressure polymorphs as structural proxies of deep Earth silicate melts | |
Bykova, E.1,2; Bykov, M.2,3; Cernok, A.2,9; Tidholm, J.4; Simak, S. I.4; Hellman, O.4,5; Belov, M. P.3; Abrikosov, I. A.4; Liermann, H. -P.1; Hanfland, M.6; Prakapenka, V. B.7; Prescher, C.7,10; Dubrovinskaia, N.8; Dubrovinsky, L.2 | |
2018-11-15 | |
发表期刊 | NATURE COMMUNICATIONS
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ISSN | 2041-1723 |
出版年 | 2018 |
卷号 | 9 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Russia; Sweden; USA; France; England |
英文摘要 | Modelling of processes involving deep Earth liquids requires information on their structures and compression mechanisms. However, knowledge of the local structures of silicates and silica (SiO2) melts at deep mantle conditions and of their densification mechanisms is still limited. Here we report the synthesis and characterization of metastable high-pressure silica phases, coesite-IV and coesite-V, using in situ single-crystal X-ray diffraction and ab initio simulations. Their crystal structures are drastically different from any previously considered models, but explain well features of pair-distribution functions of highly densified silica glass and molten basalt at high pressure. Built of four, five-, and six-coordinated silicon, coesite-IV and coesite-V contain SiO6 octahedra, which, at odds with 3rd Pauling's rule, are connected through common faces. Our results suggest that possible silicate liquids in Earth's lower mantle may have complex structures making them more compressible than previously supposed. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000450160100002 |
WOS关键词 | X-RAY-DIFFRACTION ; MOLECULAR-DYNAMICS ; PHASE-TRANSITIONS ; MGSIO3 GLASS ; SIO2 ; CHEMISTRY ; LIQUID |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/203900 |
专题 | 资源环境科学 |
作者单位 | 1.DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany; 2.Univ Bayreuth, Bayer Geoinst, Univ Str 30, D-95440 Bayreuth, Germany; 3.Natl Univ Sci & Technol MISIS, Mat Modeling & Dev Lab, Leninsky Ave 4, Moscow 119049, Russia; 4.Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, Sweden; 5.CALTECH, Dept Appl Phys & Mat Sci, 1200 East Calif Blvd, Pasadena, CA 91125 USA; 6.European Synchrotron Radiat Facil, 6 Rue Jules Horowitz, F-38000 Grenoble, France; 7.Univ Chicago, Ctr Adv Radiat Sources, 5640 South Ellis Ave, Chicago, IL 60637 USA; 8.Univ Bayreuth, Mat Phys & Technol Extreme Condit, Lab Crystallog, Univ Str 30, D-95440 Bayreuth, Germany; 9.Open Univ, Sch Phys Sci, Walton Hall, Milton Keynes MK7 6AA, Bucks, England; 10.Univ Cologne, Inst Geol & Mineral, Zulpicher Str 49b, D-50674 Cologne, Germany |
推荐引用方式 GB/T 7714 | Bykova, E.,Bykov, M.,Cernok, A.,et al. Metastable silica high pressure polymorphs as structural proxies of deep Earth silicate melts[J]. NATURE COMMUNICATIONS,2018,9. |
APA | Bykova, E..,Bykov, M..,Cernok, A..,Tidholm, J..,Simak, S. I..,...&Dubrovinsky, L..(2018).Metastable silica high pressure polymorphs as structural proxies of deep Earth silicate melts.NATURE COMMUNICATIONS,9. |
MLA | Bykova, E.,et al."Metastable silica high pressure polymorphs as structural proxies of deep Earth silicate melts".NATURE COMMUNICATIONS 9(2018). |
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