Structure and Properties of Dense Silica Glass

Wu, Min; Liang, Yunfeng; Jiang, Jianzhong; Tse, John S.

doi:10.1038/srep00398

Cited by 89 publications

(90 citation statements)

References 28 publications

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“…Such dV S / dP changes observed above~100 GPa have previously been interpreted to reflect the onset of the average Si-O coordination number changing from just 6 to 6 + (Murakami and Bass 2010, 2011). This conclusion subsequently found support in the results from MD computer simulations (Brazhkin et al 2011;Wu et al 2012). To determine the pressure conditions at which this abrupt change of dV S /dP occurs, we adopted the same criteria as Bass (2010, 2011).…”

Section: Resultsmentioning

confidence: 69%

Ultrahigh-pressure acoustic wave velocities of SiO2-Al2O3 glasses up to 200 GPa

Ohira

Murakami

Kohara

et al. 2016

Prog. in Earth and Planet. Sci.

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Extensive experimental studies on the structure and density of silicate glasses as laboratory analogs of natural silicate melts have attempted to address the nature of dense silicate melts that may be present at the base of the mantle. Previous ultrahigh-pressure experiments, however, have been performed on simple systems such as SiO 2 or MgSiO 3 , and experiments in more complex system have been conducted under relatively low-pressure conditions below 60 GPa. The effect of other metal cations on structural changes that occur in dense silicate glasses under ultrahigh pressures has been poorly understood. Here, we used a Brillouin scattering spectroscopic method up to pressures of 196.9 GPa to conduct in situ high-pressure acoustic wave velocity measurements of SiO 2 -Al 2 O 3 glasses in order to understand the effect of Al 2 O 3 on pressure-induced structural changes in the glasses as analogs of aluminosilicate melts. From 10 to 40 GPa, the transverse acoustic wave velocity (V S ) of Al 2 O 3 -rich glass (SiO 2 + 20. 5 mol% Al 2 O 3 ) was greater than that of Al 2 O 3 -poor glass (SiO 2 + 3.9 mol% Al 2 O 3 ). This result suggests that SiO 2 -Al 2 O 3 glasses with higher proportions of Al ions with large oxygen coordination numbers (5 and 6) become elastically stiffer up to 40 GPa, depending on the Al 2 O 3 content, but then soften above 40 GPa. At pressures from 40 to~100 GPa, the increase in V S with increasing pressure became less steep than below 40 GPa. Abovẽ 100 GPa, there were abrupt increases in the P-V S gradients (dV S /dP) at 130 GPa in Al 2 O 3 -poor glass and at 116 GPa in Al 2 O 3 -rich glass. These changes resemble previous experimental results on SiO 2 glass and MgSiO 3 glass. Given that changes of dV S /dP have commonly been related to changes in the Si-O coordination states in the glasses, our results, therefore, may indicate a drastic structural transformation in SiO 2 -Al 2 O 3 glasses above 116 GPa, possibly associated with an average Si-O coordination number change to higher than 6. Compared to previous acoustic wave velocity data on SiO 2 and MgSiO 3 glasses, Al 2 O 3 appears to promote a lowering of the pressure at which the abrupt increase of dV S /dP is observed. This suggests that the Al 2 O 3 in silicate melts may help to stabilize those melts gravitationally in the lower mantle.

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Section: Resultsmentioning

confidence: 69%

Ultrahigh-pressure acoustic wave velocities of SiO2-Al2O3 glasses up to 200 GPa

Ohira

Murakami

Kohara

et al. 2016

Prog. in Earth and Planet. Sci.

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“…They are also known to be an excellent host matrix for rare earth oxides because of their good glass forming ability when compared to several other conventional systems such as borate, phosphate, germinate, vanadate and tellurite glass families. This makes it an interesting system for experimental and theoretical studies [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Optical analysis of samarium doped sodium bismuth silicate glass

Thomas

Sofin

Allen

et al. 2017

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. 1 Optical Analysis of Rare Earth Doped Sodium Bismuth Silicate Glass AbstractSamarium doped sodium bismuth silicate glass was synthesized using the melt quenching method. Detailed optical spectroscopic studies of the glassy material were carried out in the UVVis-NIR spectral range. Our analysis revealed that the novel glassy system has the optimum values for the key parameters viz. spectroscopic quality factor, optical gain, stimulated emission cross section and quantum efficiency, which are required for a high performance optical amplifier. Calculated chromaticity co-ordinates (0.61, 0.38) also confirm its application potential in display devices.

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“…하지만 이전 연구에서 규산염 및 Mg-규산염 결정질 물질에 대하여 계산된 O원자 K-전자껍질 ELNES 스펙트럼이 XRS 실험결과를 재현하고 있 음을 확인하였기 때문에 본 연구에서 얻어진 결과 는 MgSiO 3 Pv의 전자구조를 반영하고 있을 것이 다 (Yi and Lee, 2010;Yi and Lee, 2012 Si-O- [6] Si 결합각( [6] Si-O1- [6] Si 결합각 3.54° 감 소; [6] Si-O2- [6] Si 결합각 4.41° 감소) 등의 국소 원 자구조에 뚜렷한 변화가 나타난다 (Table 1). (Lin et al, 2007;Fukui et al, 2009;Wu et al, 2012). …”

Section: 계산 방법unclassified

“…XRS 실험과 관련된 양자화학계산을 이용한 이전 연구에서는 X-선 Raman 산란 실험을 통하여 얻어 진 SiO 2 결정질 고압 동질이상 물질들의 Si 원자 L-전자껍질과 O 원자 K-전자껍질 XRS 스펙트럼 들의 특징적인 형태를 계산을 통하여 얻은 O 원자 의 p*-오비탈과 Si 원자의 s*-와 d*-오비탈의 국 소상태밀도(PDOS, partial density of states)를 통 하여 그 미시적인 기원을 설명하였다 (Fukui et al, 2009) (Yi and Lee, 2012). 그리 고 또 다른 연구에서는 양자화학계산을 통해 SiO 2 결정질 고압 동질이상 물질의 PDOS를 얻어 SiO 2 비정질 물질의 압력에 의한 O 원자 K-전자껍질 XRS 스펙트럼 변화의 기원이 되는 압력에 의한 원자구조의 변화를 해석하기 위하여 노력하였다 (Wu et al, 2012).…”

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“…고압상태의 규산염 및 Mg-규산염의 결정질 및 비정질 물질들의 전자구조에 대한 이전 연구들은 결정질과 비정질 물질들의 원자구조와 전자구조를 비교 분석하여 압력에 의한 Si 원자의 배위수 증가 나 O 원자 주변의 국소 원자구조(Si-O, O-O, Mg-O 거리 등)의 변화를 규산염 및 Mg-규산염 비 정질 물질에서 나타나는 압력에 의한 O 원자 K-전 자껍질 ELNES 스펙트럼 변화의 미시적 기원으로 제시하였다 (Lee et al, 2008;Fukui et al, 2009;Yi and Lee, 2010;Wu et al, 2012;Yi and Lee, 2012 (Payne et al, 1992;Marx, 2000;Tse, 2002). (Tse, 2002).…”

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Quantum Chemical Calculations of the Effect of Si-O Bond Length on X-ray Raman Scattering Features for MgSiO₃Perovskite

이유수

이성근²

2014

Journal of the Mineralogical Society of Korea

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: Probing the electronic structures of crystalline Mg-silicates at high pressure is essential for understanding the various macroscopic properties of mantle materials in Earth's interior. Quantum chemical calculations based on the density functional theory are used to explore the atomic configuration and electronic structures of Earth materials at high pressure. Here, we calculate the partial density of states (PDOS) and O K-edge energy-loss near-edge structure (ELNES) spectra for

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Structure and Properties of Dense Silica Glass

Cited by 89 publications

References 28 publications

Ultrahigh-pressure acoustic wave velocities of SiO2-Al2O3 glasses up to 200 GPa

Ultrahigh-pressure acoustic wave velocities of SiO2-Al2O3 glasses up to 200 GPa

Optical analysis of samarium doped sodium bismuth silicate glass

Quantum Chemical Calculations of the Effect of Si-O Bond Length on X-ray Raman Scattering Features for MgSiO₃Perovskite

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Structure and Properties of Dense Silica Glass

Cited by 89 publications

References 28 publications

Ultrahigh-pressure acoustic wave velocities of SiO2-Al2O3 glasses up to 200 GPa

Ultrahigh-pressure acoustic wave velocities of SiO2-Al2O3 glasses up to 200 GPa

Optical analysis of samarium doped sodium bismuth silicate glass

Quantum Chemical Calculations of the Effect of Si-O Bond Length on X-ray Raman Scattering Features for MgSiO3Perovskite

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Quantum Chemical Calculations of the Effect of Si-O Bond Length on X-ray Raman Scattering Features for MgSiO₃Perovskite