| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Liermann, Hanns-Peter
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2023Graphite resistive heated diamond anvil cell for simultaneous high-pressure and high-temperature diffraction experimentscitations
- 2023Graphite resistive heated diamond anvil cell for simultaneous high-pressure and high-temperature diffraction experimentscitations
- 2023Graphite resistive heated diamond anvil cell for simultaneous high-pressure and high-temperature diffraction experimentscitations
- 2023Evidence for a rosiaite-structured high-pressure silica phase and its relation to lamellar amorphization in quartzcitations
- 2022Fe0.79Si0.07B0.14 metallic glass gaskets for high-pressure research beyond 1 Mbarcitations
- 2022Fe$^{3+}$-hosting carbon phases in the deep Earthcitations
- 2022Simultaneous Imaging and Diffraction in the dynamic Diamond Anvil Cellcitations
- 2022Synthesis, structure, and single-crystal elasticity of Al-bearing superhydrous phase Bcitations
- 2022Fe₀.₇₉Si₀.₀₇B₀.₁₄ metallic glass gaskets for high-pressure research beyond 1Mbarcitations
- 2021Fe$_{0.79}$Si$_{0.07}$B$_{0.14}$ metallic glass gaskets for high-pressure research beyond 1 Mbar
- 2019Pressure-induced amorphization in plagioclase feldspars: A time-resolved powder diffraction study during rapid compressioncitations
- 2019High-pressure synthesis of ultraincompressible hard rhenium nitride pernitride Re2(N2)(N)2 stable at ambient conditionscitations
- 2018Phase transitions of α-quartz at elevated temperatures under dynamic compression using a membrane-driven diamond anvil cell: Clues to impact cratering?citations
- 2017Effect of composition on compressibility of skiagite-Fe-majorite garnetcitations
- 2016Stability of Fe,Al-bearing bridgmanite in the lower mantle and synthesis of pure Fe-bridgmanitecitations
- 2015Residual stress induced stabilization of martensite phase and its effect on the magnetostructural transition in Mn-rich Ni-Mn-In/Ga magnetic shape-memory alloyscitations
- 2015Pressure, stress, and strain distribution in the double-stage diamond anvil cellcitations
- 2013Structural behaviour of $Pd_{40}Cu_{30}Ni_{10}P_{20}$ metallic glass under high pressurecitations
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article
Synthesis, structure, and single-crystal elasticity of Al-bearing superhydrous phase B
Abstract
<jats:title>Abstract</jats:title><jats:p>Dense hydrous magnesium silicates (DHMSs) with large water contents and wide stability fields are a potential H2O reservoir in the deep Earth. Al-bearing superhydrous phase B (shy-B) with a wider stability field than the Al-free counterpart can play an important role in understanding H2O transport in the Earth’s transition zone and topmost lower mantle. In this study, a nominally Al-free and two different Al-bearing shy-B samples with 0.47(2) and 1.35(4) Al atoms per formula unit (pfu), were synthesized using a rotating multi-anvil press. Their single-crystal structures were investigated by X-ray diffraction (XRD) complemented by Raman spectroscopy and Fourier-transform infrared spectroscopy (FTIR). Single-crystal XRD shows that the cell parameters decrease with increasing Al-content. By combining X-ray diffraction and spectroscopy results, we conclude that the Al-poor shy-B crystallizes in the Pnn2 space group with hydrogen in two different general positions. Based on the results of the single-crystal X-ray diffraction refinements combined with FTIR spectroscopy, three substitutions mechanisms are proposed: 2Al3+ = Mg2+ + Si4+; Mg2+ = ☐Mg2+ + 2H+ (☐Mg2+ means vacancy in Mg site); Si4+ = Al3+ + H+. Thus, in addition to the two general H positions, hydrogen is incorporated into the hydrous mineral via point defects. The elastic stiffness coefficients were measured for the Al-shy-B with 1.35 pfu Al by Brillouin scattering (BS). Al-bearing shy-B shows lower C11, higher C22, and similar C33 when compared to Al-free shy-B. The elastic anisotropy of Al-bearing shy-B is also higher than that of the Al-free composition. Such different elastic properties are due to the effect of lattice contraction as a whole and the specific chemical substitution mechanism that affect bonds strength. Al-bearing shy-B with lower velocity, higher anisotropy, and wider thermodynamic stability can help understand the low-velocity zone and the high-anisotropy region in the subducted slab located in Tonga.</jats:p>