| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Mccammon, Catherine
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2023Ultrahigh‐Pressure Acoustic Velocities of Aluminous Silicate Glass up to 155 GPa With Implications for the Structure and Dynamics of the Deep Terrestrial Magma Oceancitations
- 2023Crystal chemistry and compressibility of Fe0.5Mg0.5Al0.5Si0.5O3 and FeMg0.5Si0.5O3 silicate perovskites at pressures up to 95 GPacitations
- 2020The crystal structures of Fe-bearing MgCO$_{3}$ sp$^{2}$- and sp$^{3}$-carbonates at 98 GPa from single-crystal X-ray diffraction using synchrotron radiationcitations
- 2020The crystal structures of Fe-bearing MgCO3 sp2- and sp3-carbonates at 98 GPa from single-crystal X-ray diffraction using synchrotron radiationcitations
- 2020The crystal structures of Fe-bearing MgCO3 sp(2)- and sp(3)-carbonates at 98 GPa from single-crystal X-ray diffraction using synchrotron radiationcitations
- 2019Experimental investigation of FeCO3 (siderite) stability in Earth's lower mantle using XANES spectroscopycitations
- 2019Comparative study of the influence of pulsed and continuous wave laser heating on the mobilization of carbon and its chemical reaction with iron in a diamond anvil cellcitations
- 2017Effect of composition on compressibility of skiagite-Fe-majorite garnetcitations
- 2011Pressure-induced structural phase transition of the iron end-member of ringwoodite (gamma-Fe(2)SiO(4)) investigated by X-ray diffraction and Mossbauer spectroscopycitations
- 2010High-temperature Mossbauer spectroscopy: A probe for the relaxation time of Fe species in silicate melts and glassescitations
Places of action
| Organizations | Location | People |
|---|
article
Crystal chemistry and compressibility of Fe0.5Mg0.5Al0.5Si0.5O3 and FeMg0.5Si0.5O3 silicate perovskites at pressures up to 95 GPa
Abstract
<jats:p>Silicate perovskite, with the mineral name bridgmanite, is the most abundant mineral in the Earth’s lower mantle. We investigated crystal structures and equations of state of two perovskite-type Fe<jats:sup>3+</jats:sup>-rich phases, FeMg<jats:sub>0.5</jats:sub>Si<jats:sub>0.5</jats:sub>O<jats:sub>3</jats:sub> and Fe<jats:sub>0.5</jats:sub>Mg<jats:sub>0.5</jats:sub>Al<jats:sub>0.5</jats:sub>Si<jats:sub>0.5</jats:sub>O<jats:sub>3</jats:sub>, at high pressures, employing single-crystal X-ray diffraction and synchrotron Mössbauer spectroscopy. We solved their crystal structures at high pressures and found that the FeMg<jats:sub>0.5</jats:sub>Si<jats:sub>0.5</jats:sub>O<jats:sub>3</jats:sub> phase adopts a novel monoclinic double-perovskite structure with the space group of <jats:italic>P21/n</jats:italic> at pressures above 12 GPa, whereas the Fe<jats:sub>0.5</jats:sub>Mg<jats:sub>0.5</jats:sub>Al<jats:sub>0.5</jats:sub>Si<jats:sub>0.5</jats:sub>O<jats:sub>3</jats:sub> phase adopts an orthorhombic perovskite structure with the space group of <jats:italic>Pnma</jats:italic> at pressures above 8 GPa. The pressure induces an iron spin transition for Fe<jats:sup>3+</jats:sup> in a (Fe<jats:sub>0.7</jats:sub>,Mg<jats:sub>0.3</jats:sub>)O<jats:sub>6</jats:sub> octahedral site of the FeMg<jats:sub>0.5</jats:sub>Si<jats:sub>0.5</jats:sub>O<jats:sub>3</jats:sub> phase at pressures higher than 40 GPa. No iron spin transition was observed for the Fe<jats:sub>0.5</jats:sub>Mg<jats:sub>0.5</jats:sub>Al<jats:sub>0.5</jats:sub>Si<jats:sub>0.5</jats:sub>O<jats:sub>3</jats:sub> phase as all Fe<jats:sup>3+</jats:sup> ions are located in bicapped prism sites, which have larger volumes than an octahedral site of (Al<jats:sub>0.5</jats:sub>,Si<jats:sub>0.5</jats:sub>)O<jats:sub>6</jats:sub>.</jats:p>