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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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Lord, Ot
University of Bristol
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2024Experimental Observation of a New Attenuation Mechanism in hcp ‐Metals That May Operate in the Earth's Inner Core
- 2016The phase diagram of NiSi under the conditions of small planetary interiorscitations
- 2014The melting curve of Ni to 1 Mbarcitations
- 2013The role of beam dispersion in Raman and photo-stimulated luminescence piezo-spectroscopy of yttria-stabilized zirconia in multi-layered coatingscitations
- 2012Perovskite Phase Relations in the System CaO–MgO–TiO2–SiO2 and Implications for Deep Mantle Lithologiescitations
- 2012Calibration of Raman Spectroscopy in the Stress Measurement of Air-Plasma-Sprayed Yttria-Stabilized Zirconiacitations
- 2012High-pressure phase transitions and equations of state in NiSi. II. Experimental resultscitations
- 2011Equation of state and phase diagram of FeOcitations
- 2011Phase transition and metallization of FeO at high pressures and temperaturescitations
- 2009Melting in the Fe–C system to 70 GPacitations
Places of action
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article
The phase diagram of NiSi under the conditions of small planetary interiors
Abstract
The phase diagram of NiSi has been determined using <em>in situ</em>synchrotron X-ray powder diffraction multi-anvil experiments to 19 GPa,with further preliminary results in the laser-heated diamond cellreported to 60 GPa. The low-pressure MnP-structured phase transforms totwo different high-pressure phases depending on the temperature: theε-FeSi structure is stable at temperatures above ∼1100 K and apreviously reported distorted-CuTi structure (with <em>Pmmn</em>symmetry) is stable at lower temperature. The invariant point is locatedat 12.8 ± 0.2 GPa and 1100 ± 20 K. At higher pressures, ε-FeSi-structured NiSi transforms to the CsCl structure with CsCl-NiSi asthe liquidus phase above 30 GPa. The Clapeyron slope of this transitionis -67 MPa/K. The phase boundary between the ε -FeSi and <em>Pmmn</em>structured phases is nearly pressure independent implying there will be asecond sub-solidus invariant point between CsCl, ε -FeSi and <em>Pmmn</em>structures at higher pressure than attained in this study. In additionto these stable phases, the MnP structure was observed to spontaneouslytransform at room temperature to a new orthorhombic structure (also with<em>Pnma</em> symmetry) which had been detailed in previous <em>ab initio</em> simulations. This new phase of NiSi is shown here to be metastable.