Melting behavior of SiO2 up to 120 GPa

Andrault, Denis; Morard, Guillaume; Garbarino, Gastón; Mézouar, M.; Bouhifd, Mohamed Ali; Kawamoto, Tatsuhiko

doi:10.1007/s00269-019-01077-3

Cited by 15 publications

(36 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For stishovite, we compute

T_{m} = 4210 \pm 120

K at 24 GPa, with the uncertainty (two standard deviations) determined by 1,000 Monte Carlo passes, varying the thermodynamic parameters (Tables S1–S4 in Supporting Information S1), slightly higher than

T_{m} = 3920

K from de Koker et al. (2013), but consistent with DAC experiments that bracket melting with

T = 3800 - 4300

K at

P = 22 - 29

GPa (Shen & Lazor, 1995) and

T = 4000 - 4400

K at

P = 27 - 29

GPa (Andrault et al., 2020; Figures 2 and 3b).…”

Section: Thermodynamic Descriptionsupporting

confidence: 76%

Lower Mantle Melting: Experiments and Thermodynamic Modeling in the System MgO‐SiO₂

2021

View full text Add to dashboard Cite

Characterizing and modeling melting relations in the system MgO‐SiO2 at lower mantle pressures rely on the location of the eutectic points for MgO‐MgSiO3 and MgSiO3‐SiO2. While at an uppermost lower mantle pressure there is general consensus on the eutectic composition in the former, large discrepancies exist for MgSiO3‐SiO2 from experiments in the diamond anvil cell, ab‐initio simulations and models built on them. In order to address this discrepancy, we have performed multi‐anvil press experiments at 24 GPa for Mg4Si6O16 and Mg3Si7O17 at temperatures of 2650±100 K and 2750±100 K. In the experiments at 2750±100 K, we observe the presence of partial melt. The recovered Mg4Si6O16 sample shows SiO2 stishovite as the liquidus phase, and electron microprobe analysis of the quenched melt determines XSiO2=0.53±0.03 as the eutectic composition. We fit a thermodynamic model to describe the melting relations in the MgO‐SiO2 system, and extrapolate to core‐mantle boundary pressure. At 136 GPa, we predict that the eutectic points have moved further away from enstatite composition, and solidus temperatures remain similar for MgO‐MgSiO3 and MgSiO3‐SiO2.

show abstract

“…For stishovite, we compute

T_{m} = 4210 \pm 120

T_{m} = 3920

K from de Koker et al. (2013), but consistent with DAC experiments that bracket melting with

T = 3800 - 4300

K at

P = 22 - 29

GPa (Shen & Lazor, 1995) and

T = 4000 - 4400

K at

P = 27 - 29

GPa (Andrault et al., 2020; Figures 2 and 3b).…”

Section: Thermodynamic Descriptionsupporting

confidence: 76%

Lower Mantle Melting: Experiments and Thermodynamic Modeling in the System MgO‐SiO₂

2021

View full text Add to dashboard Cite

show abstract

“…By taking all this information into account, solid media such as NaCl, KCl, Al 2 O 3 , SiO 2 , or MgO and noble gases such as Ar or Ne are the PTM that are mostly used in a laser heating melting experiment. Figure 3 gathers together all the experimentally established melting curves of the most commonly used PTM inside an LH-DAC [192][193][194][195][196][197][198].…”

Section: Pressure Transmitting Medium (Ptm)mentioning

confidence: 99%

“…This technique can become more powerful if the laser pulse is synchronized with a synchrotron radiation pulse and a fast detector. [192][193][194][195][196][197][198]. Solid lines: solid PTMs, dash-dotted lines: gas PTMs.…”

Section: Lasersmentioning

confidence: 99%

See 1 more Smart Citation

A Review of the Melting Curves of Transition Metals at High Pressures Using Static Compression Techniques

Parisiades

2021

Crystals

View full text Add to dashboard Cite

The accurate determination of melting curves for transition metals is an intense topic within high pressure research, both because of the technical challenges included as well as the controversial data obtained from various experiments. This review presents the main static techniques that are used for melting studies, with a strong focus on the diamond anvil cell; it also explores the state of the art of melting detection methods and analyzes the major reasons for discrepancies in the determination of the melting curves of transition metals. The physics of the melting transition is also discussed.

show abstract

“…Shown is data with quartz or fused silica as a starting material: black and grey squares from 2 , circles from 10 , right triangles from 12 , lower triangles from 15 and stars from 17 as well as stishovite as a starting material: white squares 4 , upper triangles 27 , crosses 34 and left triangles 28 . Furthermore melting lines are indicated: brown 26 , orange 51 , pink 52 , blue 53 , green 54 and light blue 55,56 . www.nature.com/scientificreports www.nature.com/scientificreports/…”

Section: Discussionmentioning

confidence: 99%

Evidence of shock-compressed stishovite above 300 GPa

Schoelmerich

Tschentscher

Bhat

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Sio 2 is one of the most fundamental constituents in planetary bodies, being an essential building block of major mineral phases in the crust and mantle of terrestrial planets (1-10 M E). Silica at depths greater than 300 km may be present in the form of the rutile-type, high pressure polymorph stishovite (P4 2 /mnm) and its thermodynamic stability is of great interest for understanding the seismic and dynamic structure of planetary interiors. previous studies on stishovite via static and dynamic (shock) compression techniques are contradictory and the observed differences in the lattice-level response is still not clearly understood. Here, laser-induced shock compression experiments at the LcLS-and SAcLA XfeL light-sources elucidate the high-pressure behavior of stishovite on the lattice-level under in situ conditions on the Hugoniot to pressures above 300 GPa. We find stishovite is still (meta-)stable at these conditions, and does not undergo any phase transitions. this contradicts static experiments showing structural transformations to the cacl 2 , α-pbo 2 and pyrite-type structures. However, rate-limited kinetic hindrance may explain our observations. these results are important to our understanding into the validity of eoS data from nanosecond experiments for geophysical applications. Stishovite, the high-pressure polymorph of silica, is of vast interest for planetary-and material science as a dominant constituent material in the mantle of Earth and larger terrestrial extra-solar planets. Under equilibrium conditions, stishovite becomes the stable form of SiO 2 at pressures above ~7 GPa and crystallizes in the rutile-type structure (P4 2 /mnm), consisting of octahedrally coordinated Si atoms 1-3. Static compression studies using diamond anvil cell (DAC) techniques show, that stishovite undergoes a displacive phase transition to the orthorhombic CaCl 2-type structure (Pnnm) at ~60 GPa 4-10 and a further transition to the α-PbO 2 type structure (Pbcn) at ~121 GPa 10-16. To date, the highest-pressure experimentally determined SiO 2 phase transformation is to the pyrite-type structure (Pa3) at around 268 GPa 17. Additionally, silica has been explored using dynamic shock compression experiments. Shock compression studies of fused silica and quartz up to 200 GPa indicate phase transitions to stishovite, post-stishovite phase(s) and melting above 120 GPa 18-23. However, only few studies use stishovite as a starting material. This is mainly due to the difficulty of synthesizing large specimens of stishovite without impurities or significant porosity, and preparing these samples for shock compression experiments. Stishovite has been shock compressed in the pressure regime between 193.6-235.7 GPa with the gas gun technique 24 , between 316-992 GPa with the flyer plate technique at the Z-machine 25 and in the pressure regime between 1032.2-2660.4 GPa with the decaying shock method at the OMEGA laser facility 26. All three studies resolve the stishovite continuum Hugoniot. In contrast to static experiments 5 , there is...

show abstract

Melting behavior of SiO2 up to 120 GPa

Cited by 15 publications

References 32 publications

Lower Mantle Melting: Experiments and Thermodynamic Modeling in the System MgO‐SiO₂

Lower Mantle Melting: Experiments and Thermodynamic Modeling in the System MgO‐SiO₂

A Review of the Melting Curves of Transition Metals at High Pressures Using Static Compression Techniques

Evidence of shock-compressed stishovite above 300 GPa

Contact Info

Product

Resources

About

Melting behavior of SiO2 up to 120 GPa

Cited by 15 publications

References 32 publications

Lower Mantle Melting: Experiments and Thermodynamic Modeling in the System MgO‐SiO2

Lower Mantle Melting: Experiments and Thermodynamic Modeling in the System MgO‐SiO2

A Review of the Melting Curves of Transition Metals at High Pressures Using Static Compression Techniques

Evidence of shock-compressed stishovite above 300 GPa

Contact Info

Product

Resources

About

Lower Mantle Melting: Experiments and Thermodynamic Modeling in the System MgO‐SiO₂

Lower Mantle Melting: Experiments and Thermodynamic Modeling in the System MgO‐SiO₂