Signature of a polyamorphic transition in the THz spectrum of vitreous GeO2

被引：7

作者：

Cunsolo, Alessandro ^{[1
]}

Li, Yan ^{[2
]}

Kodituwakku, Chaminda N. ^{[1
]}

Wang, Shibing ^{[3
]}

Antonangeli, Daniele ^{[4
]}

Bencivenga, Filippo ^{[5
]}

Battistoni, Andrea ^{[5
,6
]}

Verbeni, Roberto ^{[7
]}

Tsutsui, Satoshi ^{[8
]}

Baron, Alfred Q. R. ^{[8
,9
]}

Mao, Ho-Kwang ^{[10
,11
]}

Bolmatov, Dima ^{[1
]}

Cai, Yong Q. ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Natl Synchrotron Light Source 2, Upton, NY 11973 USA

[2] Amer Phys Soc, Ridge, NY 11961 USA

[3] Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA

[4] Sorbonne Univ UPMC, Museum Natl Hist Nat, Inst Mineral Phys Mat & Cosmochim, UMR CNRS 7590,IRD Unite 206, F-75252 Paris, France

[5] Sincrotrone Trieste, Trieste, Italy

[6] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

[7] European Synchrotron Radiat Facil ESRF, F-38043 Grenoble, France

[8] Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan

[9] SPring 8 RIKEN, Mikazuki, Hyogo 6795148, Japan

[10] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA

[11] Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

关键词：

LIQUID PHASE-TRANSITION; HIGH-PRESSURE; CRYSTALLINE; SCATTERING; DYNAMICS;

D O I：

10.1038/srep14996

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The THz spectrum of density fluctuations, S(Q, omega), of vitreous GeO2 at ambient temperature was measured by inelastic x-ray scattering from ambient pressure up to pressures well beyond that of the known alpha-quartz to rutile polyamorphic (PA) transition. We observe significant differences in the spectral shape measured below and above the PA transition, in particular, in the 30-80 meV range. Guided by first-principle lattice dynamics calculations, we interpret the changes in the phonon dispersion as the evolution from a quartz-like to a rutile-like coordination. Notably, such a crossover is accompanied by a cusp-like behavior in the pressure dependence of the elastic response of the system. Overall, the presented results highlight the complex fingerprint of PA phenomena on the high-frequency phonon dispersion.

引用

页数：9

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