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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
High-pressure phase transitions and equations of state in NiSi. II. Experimental results
Abstract
<p>The high-pressure structures of nickel monosilicide (NiSi) have been investigated to 124 GPa by synchrotron-based X-ray powder diffraction studies of quenched samples from laser-heated diamond anvil cell experiments, and the equations of state of three of these phases have been determined at room temperature. NiSi transforms from the MnP (B31) structure (space group <i>Pnma</i>) to the -FeSi (B20) structure (space group <i>P</i>213) at 12.5 ± 4.5 GPa and 1550 ± 150 K. Upon further compression, the CsCl (B2) structure (space group <i>Pm</i>3<i>m</i>) becomes stable at 46 ± 3 GPa and 1900 ± 150 K. Thus, NiSi will be in the B2 structure throughout the majority of the Earth's mantle and its entire core, and will likely form a solid solution with FeSi, which is already known to undergo a B20 B2 transition at high pressure. Data from the quenched (room-temperature) samples of all three phases have been fitted to the third-order Birch-Murnaghan equation of state. For the MnP (B31) structure this yields <i>K</i>0 = 165 ± 3 GPa with <i>K</i>0' fixed at 4 and <i>V</i>0 fixed at 12.1499 Å3 atom-1 [<i>V</i>0 from unpublished neutron diffraction measurements on the same batch of starting material; Wood (2011), personal communication]. For the -FeSi (B20) structure, <i>K</i>0 =161± 3 GPa and <i>K</i>0' = 5.6 ± 0.2 with <i>V</i>0 fixed at 11.4289 Å3 atom-1. For the CsCl (B2) structure, <i>K</i>0 = 200 ± 9 GPa, <i>K</i>0' = 4.6 ± 0.1 and <i>V</i>0 = 11.09 ± 0.05 Å3 atom-1. The ambient volume of NiSi, therefore, decreases by 6% at the first phase transition and then by a further 3% at the transition to the CsCl structure. Traces of additional NiSi structures predicted by Vocadlo, Wood & Dobson [<i>J. Appl. Cryst</i>. (2012), <b>45</b>, 186-196; part I], and labelled therein as <i>Pbma</i>-I, <i>Pnma</i>-II, and possibly also <i>Pnma</i>-III and <i>P</i>4/<i>nmm</i>, have been detected.</p>