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)
AbstractWith 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.
Subject AreaPhysics
Indexed BySCI ; ADS
WOS IDWOS:000332614100002
ADS Bibcode2014NJPh...16b3022D
ADS URLhttps://ui.adsabs.harvard.edu/abs/2014NJPh...16b3022D
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2014NJPh...16b3022D/citations
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Cited Times:9 [ADS]
Document Type期刊论文
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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.
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.
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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