| Pressure-induced drastic collapse of a high oxygen coordination shell in quartz-like alpha-GeO2 |
| Dong JC(董俊才) ; Zhang XL(张晓丽); Dong, JC; Zhang, XL; Zhang, Q; Wu, Y; Wu, X; Wu, ZY; Chen, DL; Wu ZY(吴自玉); Chen DL(陈栋梁)
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| 2014
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| 发表期刊 | NEW JOURNAL OF PHYSICS
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| 卷号 | 16页码:23022 |
| 摘要 | With the combination of a single crystal diamond anvil cell and a polycapillary half-lens, the local structural evolution around germanium in tetrahedrally networked quartz-like alpha-GeO2 has been investigated using extended x-ray absorption fine structure spectroscopy of up to 14 GPa by multiple-scattering analysis method. While the first shell Ge-O bond distances show a slight contraction with increasing pressure, the third shell Ge-O bond distances are found to decrease dramatically. The sluggish lengthening of the first shell Ge-O bond distances, initiated by coordination increase from fourfold to sixfold, occurs in the 7-14 GPa range just when the third shell Ge-O bond distances fall in the region of the second shell Ge-Ge bond distances. Moreover, these features are accompanied by the closing of intertetrahedral Ge-O-Ge angles and the opening of two intratetrahedral O-Ge-O angles, whose topological configuration surprisingly exhibits a helical chirality along the c axis that is opposite to the double helices of the corner-linked GeO4 tetrahedra. These results suggest that the high-pressure phase transitions in quartz and quartz-like materials could be associated with a structural instability that is driven by the drastic collapse of the next-nearest-neighbour anion shell, which is consistent with the emergence of high-symmetry anion sublattice. Our findings provide crucial insights into the densification mechanisms of quartz-like oxides, which would have broad implications for our understanding of the metastability of various post-quartz crystalline phases and pressure-induced amorphization. |
| 学科领域 | Physics
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| DOI | 10.1088/1367-2630/16/2/023022
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| 收录类别 | SCI
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| WOS记录号 | WOS:000332614100002
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.ihep.ac.cn/handle/311005/225210
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| 专题 | 多学科研究中心
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推荐引用方式
GB/T 7714 |
Dong JC,Zhang XL,Dong, JC,et al. Pressure-induced drastic collapse of a high oxygen coordination shell in quartz-like alpha-GeO2[J]. NEW JOURNAL OF PHYSICS,2014,16:23022.
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| APA |
董俊才.,张晓丽.,Dong, JC.,Zhang, XL.,Zhang, Q.,...&陈栋梁.(2014).Pressure-induced drastic collapse of a high oxygen coordination shell in quartz-like alpha-GeO2.NEW JOURNAL OF PHYSICS,16,23022.
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| MLA |
董俊才,et al."Pressure-induced drastic collapse of a high oxygen coordination shell in quartz-like alpha-GeO2".NEW JOURNAL OF PHYSICS 16(2014):23022.
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