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DOI | 10.1029/2019GL083613 |
Oxygen Vacancy Ordering in Aluminous Bridgmanite in the Earth's Lower Mantle | |
Grueninger, Helen1; Liu, Zhaodong2; Siegel, Renee1; Ballaran, Tiziana Boffa2; Katsura, Tomoo2; Senker, Juergen1; Frost, Daniel J.2 | |
2019-08-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:15页码:8731-8740 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | Oxygen vacancies (OVs), that charge-balance the replacement of octahedrally coordinated Si4+ by Al3+ in the mineral bridgmanite, will influence transport properties in the lower mantle but little is known about their stability and local structure. Using Al-27 nuclear magnetic resonance (NMR) spectroscopy we have characterized OVs within six aluminous bridgmanite samples. In the resulting NMR spectra sixfold, fivefold, and fourfold coordinated Al species are resolved, in addition to near eightfold coordinated Al substituting for Mg. Fivefold coordinated Al is formed by single OV sites but fourfold coordination must result from short range ordering of OVs, producing OV clusters that may form through migration into twin domain walls. Characterizing the occurrence of such OV structures is an important prerequisite for understanding how transport properties change with depth and composition in the lower mantle. Plain Language Summary The lower mantle encompasses the largest region of the Earth's interior and is mainly composed of the perovskite-structured mineral (Mg,Fe,Al)(Al,Si)O-3 bridgmanite. Its properties, therefore, control both the diffusive transport of elements and solid state flow in the lower mantle, which will be strongly influenced by point defects. We have identified and quantified defects in bridgmanite that arise from the replacement of silicon by aluminum and result in the creation of a vacant oxygen site. These oxygen defects are also found to form clusters in the structure, which in other perovskite structured minerals have been shown to strongly affect physical properties. As defect formation and ordering is dependent on composition and pressure, strong variations in physical properties may be expected within the upper 300 km of the lower mantle. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000483812500016 |
WOS关键词 | INTEGER QUADRUPOLAR NUCLEI ; SILICATE PEROVSKITE ; MGSIO3 PEROVSKITE ; (MG,FE)(SI,AL)O-3 PEROVSKITE ; IONIC-CONDUCTIVITY ; NMR PARAMETERS ; HIGH-PRESSURE ; AL-27 ; SUBSTITUTION ; TRANSITIONS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/186022 |
专题 | 气候变化 |
作者单位 | 1.Univ Bayreuth, Inorgan Chem 3, Bayreuth, Germany; 2.Univ Bayreuth, Bayer Geoinst, Bayreuth, Germany |
推荐引用方式 GB/T 7714 | Grueninger, Helen,Liu, Zhaodong,Siegel, Renee,et al. Oxygen Vacancy Ordering in Aluminous Bridgmanite in the Earth's Lower Mantle[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(15):8731-8740. |
APA | Grueninger, Helen.,Liu, Zhaodong.,Siegel, Renee.,Ballaran, Tiziana Boffa.,Katsura, Tomoo.,...&Frost, Daniel J..(2019).Oxygen Vacancy Ordering in Aluminous Bridgmanite in the Earth's Lower Mantle.GEOPHYSICAL RESEARCH LETTERS,46(15),8731-8740. |
MLA | Grueninger, Helen,et al."Oxygen Vacancy Ordering in Aluminous Bridgmanite in the Earth's Lower Mantle".GEOPHYSICAL RESEARCH LETTERS 46.15(2019):8731-8740. |
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