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Fe0.79Si0.07B0.14 metallic glass gaskets for high-pressure research beyond 1 Mbar
Weiwei Dong, Konstantin Glazyrin, Saiana Khandarkhaeva +5
A gasket is an important constituent of a diamond anvil cell (DAC) assembly, responsible for the sample chamber stability at extreme conditions for x-ray diffraction studies. In th…
Stabilization of hexazine rings in potassium polynitride at high pressure
Yu Wang, Maxim Bykov, Elena Bykova +6
Polynitrogen molecules represent the ultimate high energy-density materials as they have a huge potential chemical energy originating from their high enthalpy. However, synthesis a…
High-pressure structural study of a-Mn: solving a three decades-old mystery
Logan K. Magad-Weiss, Adebayo A. Adeleke, Eran Greenberg +3
Manganese, in the a-Mn structure, has been studied using synchrotron powder x-ray diffraction in a diamond anvil cell up to 220 GPa at room temperature combined with density functi…
A latent heat method to detect melting and freezing of metals at megabar pressures
Zachary M. Geballe, Nicholas Holtgrewe, Amol Karandikar +3
The high-pressure melting curves of metals provide simple and useful tests for theories of melting, as well as important constraints for the modeling of planetary interiors. Here,…
Novel hydrogen clathrate hydrate
Yu Wang, Konstantin Glazyrin, Valery Roizen +8
We report a new hydrogen clathrate hydrate synthesized at 1.2 GPa and 298 K documented by single-crystal X-ray diffraction, Raman spectroscopy, and first-principles calculations. T…
High-pressure synthesis of ultraincompressible hard rhenium nitride pernitride Re(N)N stable at ambient conditions
Maxim Bykov, Stella Chariton, Hongzhan Fei +17
Here we report the synthesis of metallic, ultraincompressible (bulk modulus = 428(10) GPa) and very hard (nanoindentation hardness 36.7(8) GPa) rhenium (V) nitride pernitri…
Helium-hydrogen immiscibility at high pressures
Yu Wang, Xiao Zhang, Shuqing Jiang +6
Hydrogen and helium are the most abundant elements in the universe and they constitute the interiors of gas giant planets. Thus, their equations of states, phase, chemical state, a…
Synthesis of clathrate cerium superhydride CeH9 below 100 GPa with atomic hydrogen sublattice
Nilesh P. Salke, M. Mahdi Davari Esfahani, Youjun Zhang +7
Hydrogen-rich superhydrides are believed to be very promising high-Tc superconductors as they are expected to mimic characteristics of metallic hydrogen. Recent experiments discove…
Anharmonicity-induced isostructural phase transition of Zirconium under pressure
Elissaios Stavrou, Lin H. Yang, Per Soderlind +8
We have performed a detailed x-ray diffraction structural study of Zr under pressure and unambiguously identify the existence of a first-order isostructural bcc-to-bcc phase transi…
Uranium polyhydrides at moderate pressures: prediction, synthesis, and expected superconductivity
Ivan A. Kruglov, Alexander G. Kvashnin, Alexander F. Goncharov +7
Hydrogen-rich hydrides attract great attention due to recent theoretical (1) and then experimental discovery of record high-temperature superconductivity in H3S (Tc = 203 K at 155…
Size-Dependent Structural Phase Transitions in SrTiO3 Nanoparticles
Han Zhang, Sizhan Liu, Megan E. Scofield +5
Understanding the structural phase diagram of nano scale SrTiO3 has important implications on the basic physics and applications of the general class of transition metal oxide pero…