The pressure–temperature phase diagram of tetramorphic pyrazinamide by vapour pressure and synchrotron X-ray diffraction under pressure

X-ray diffraction on solids under pressure

2014 In the first part, various techniques and examples for X-ray diffraction on polycrystalline samples under high pressure will be reviewed with special emphasis on a comparison between angular and energy dispersive techniques. The second part reviews X-ray diffraction techniques for single crystals under pressure and demonstrates on few examples typical applications. Revue Phys. Appl.19 (198...

Boron under Pressure: Phase Diagram and Novel High-pressure Phase

Boron has a unique chemistry, responsible for remarkable complexities even in the pure element. I review some of the history of the discovery of this element, and recent surprises found in boron under pressure. I discuss the recent discovery of a new high-pressure phase, γ-B28, consisting of icosahedral B12 clusters and B2 pairs in a NaCl-type arrangement: (B2)(B12), and displaying a significan...

High-pressure phases of uranium monophosphide studied by synchrotron x-ray diffraction.

Origin of Pressure-induced Superconducting Phase in KxFe2−ySe2 studied by Synchrotron X-ray Diffraction and Spectroscopy

Pressure dependence of the electronic and crystal structures of KxFe2-ySe2, which has pressure-induced two superconducting domes of SC I and SC II, was investigated by x-ray emission spectroscopy and diffraction. X-ray diffraction data show that compressibility along the c-axis changes around 12 GPa, where a new superconducting phase of SC II appears. This suggests a possible tetragonal to coll...

High-pressure structure and equation of state study of nitrosonium nitrate from synchrotron x-ray diffraction

Several nitrogen oxide compounds transform to nitrosonium nitrate (NONO3 ) under high pressure. In this study, NONO3 2 was synthesized by laser heating of N2O in a diamond-anvil cell and characterized by x-ray diffraction as a function of pressure at room temperature and low temperature. The unit-cell parameters were refined up to 32.2 GPa at 300 K, resulting in a denser structure than reported...