S. Ninet
YOU?
Author Swipe
View article: X-Ray Signature of the Superionic Transition in Warm Dense fcc Water Ice
X-Ray Signature of the Superionic Transition in Warm Dense fcc Water Ice Open
The fcc superionic phase of ice is a key component of the warm dense water phase diagram. While a few x-ray diffraction studies, under dynamic and static compressions, have reported the stability of the fcc structure, the transition to the…
View article: Phase transition kinetics of superionic H2O ice phases revealed by Megahertz X-ray free-electron laser-heating experiments
Phase transition kinetics of superionic H2O ice phases revealed by Megahertz X-ray free-electron laser-heating experiments Open
H 2 O transforms to two forms of superionic (SI) ice at high pressures and temperatures, which contain highly mobile protons within a solid oxygen sublattice. Yet the stability field of both phases remains debated. Here, we present the res…
View article: Orientational Disorder Drives Site Disorder in Plastic Ammonia Hemihydrate
Orientational Disorder Drives Site Disorder in Plastic Ammonia Hemihydrate Open
In the 2-10 GPa pressure range, ammonia hemihydrate H_{2}O:(NH_{3})_{2} (AHH) is a molecular solid in which intermolecular interactions are ruled by distinct types of hydrogen bonds. Upon heating, the low-temperature ordered P2_{1}/c cryst…
View article: High pressure-temperature phase diagram of ammonia hemihydrate
High pressure-temperature phase diagram of ammonia hemihydrate Open
We report a comprehensive experimental investigation of the phase diagram of ammonia hemihydrate (AHH) in the range of 2-30 GPa and 300-700 K, based on Raman spectroscopy and x-ray diffraction experiments and visual observations. Four soli…
View article: Observation of a Plastic Crystal in Water–Ammonia Mixtures under High Pressure and Temperature
Observation of a Plastic Crystal in Water–Ammonia Mixtures under High Pressure and Temperature Open
Solid mixtures of ammonia and water, the so-called ammonia hydrates, are thought to be major components of solar and extra-solar icy planets. We present here a thorough characterization of the recently reported high pressure (P)-temperatur…
View article: Evidence and Stability Field of fcc Superionic Water Ice Using Static Compression
Evidence and Stability Field of fcc Superionic Water Ice Using Static Compression Open
Structural transformation of hot dense water ice is investigated by combining synchrotron x-ray diffraction and a laser-heating diamond anvil cell above 25 GPa. A transition from the body-centered-cubic (bcc) to face-centered-cubic (fcc) o…
View article: Exploring the deep interior of ice giants with shock-compression experiments and ab initio simulations: The case of metallic ammonia 
Exploring the deep interior of ice giants with shock-compression experiments and ab initio simulations: The case of metallic ammonia  Open
<p>Ammonia is predicted to be one of the major components in the depths of the ice giant planets Uranus and Neptune. Their dynamics, evolution, and interior structure are insufficiently understood and models rely imperatively on data…
View article: Metallization of Shock-Compressed Liquid Ammonia
Metallization of Shock-Compressed Liquid Ammonia Open
Ammonia is predicted to be one of the major components in the depths of the ice giant planets Uranus and Neptune. Their dynamics, evolution, and interior structure are insufficiently understood and models rely imperatively on data for equa…
View article: Melting Curve and Isostructural Solid Transition in Superionic Ice
Melting Curve and Isostructural Solid Transition in Superionic Ice Open
The phase diagram and melting curve of water ice is investigated up to 45 GPa and 1600 K by synchrotron x-ray diffraction in the resistively and laser heated diamond anvil cell. Our melting data evidence a triple point at 14.6 GPa, 850 K. …
View article: Melting curve and phase diagram of ammonia monohydrate at high pressure and temperature
Melting curve and phase diagram of ammonia monohydrate at high pressure and temperature Open
The phase diagram and melting behavior of the equimolar water–ammonia mixture have been investigated by Raman spectroscopy, x-ray diffraction, and visual observations from 295 K to 675 K and up to 9 GPa. Our results show non-congruent melt…
View article: Sound velocity and refractive index of pure N2 fluid and of equimolar N2–CO2 fluid mixture up to 15 GPa
Sound velocity and refractive index of pure N2 fluid and of equimolar N2–CO2 fluid mixture up to 15 GPa Open
The sound velocity and refractive index of pure N2 and of the equimolar N2–CO2 mixture are measured up to 15 GPa and 700 K in a resistive heating diamond anvil cell. The refractive index vs pressure is obtained by an interferometric method…
View article: Transformation of Ammonium Azide at High Pressure and Temperature
Transformation of Ammonium Azide at High Pressure and Temperature Open
The compression of ammonium azide (AA) has been considered to be a promising route for producing high energy-density polynitrogen compounds. So far though, there is no experimental evidence that pure AA can be transformed into polynitrogen…
View article: Determination of the melting curve of gold up to 110 GPa
Determination of the melting curve of gold up to 110 GPa Open
International audience
View article: Crystal Structure and Stability of Ammonium Azide Under High Pressure
Crystal Structure and Stability of Ammonium Azide Under High Pressure Open
Due to its potential applications as a high-energy density material, the high-pressure polymorphs of ammonium azide (AA) have received much attention recently. However, the crystal structure of phase II (AA-II), stable above 3.0 GPa, has r…
View article: Structure of liquid ammonia at high pressures and temperatures
Structure of liquid ammonia at high pressures and temperatures Open
International audience
View article: Melting curve and chemical stability of ammonia at high pressure: Combined x-ray diffraction and Raman study
Melting curve and chemical stability of ammonia at high pressure: Combined x-ray diffraction and Raman study Open
International audience
View article: Melting Curve and Liquid Structure of Nitrogen Probed by X-ray Diffraction to 120 GPa
Melting Curve and Liquid Structure of Nitrogen Probed by X-ray Diffraction to 120 GPa Open
Synchrotron x-ray diffraction measurements of nitrogen are performed up to 120 GPa to determine the melting curve and the structural changes of the solid and liquid phases along it. The melting temperature exhibits a monotonic increase up …
View article: Structure of liquid carbon dioxide at pressures up to 10 GPa
Structure of liquid carbon dioxide at pressures up to 10 GPa Open
The short-range structure of liquid carbon dioxide is investigated at pressures (P) up to 10 GPa and temperatures (T) from 300 to 709 K by means of x-ray diffraction experiments in a diamond anvil cell (DAC) and classical molecular dynamic…