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Observation of Body-Centered Cubic Iron above 200 Gigapascals
Zuzana Konopkova, Eric Edmund, Orianna B Ball +34
The crystallographic structure of iron under extreme conditions is a key benchmark for cutting-edge experimental and numerical methods. Moreover, it plays a crucial role in underst…
Low-symmetry polymorph of GaP upends bonding paradigms of metallic high-pressure III-V compounds
Barbara Lavina, Enrique Zanardi, Andrés Mujica +4
The pressure-induced polymorphism of binary octect compounds has long been considered a settled problem although the possible atomic disordering of some phases remains a puzzling o…
Efficient Up-Conversion in CsPbBr3 Nanocrystals via Phonon-Driven Exciton-Polaron Formation
Abdullah S. Abbas, Beiye C. Li, Richard D. Schaller +4
Lead halide perovskite nanocrystals demonstrate efficient up-conversion, although the precise mechanism remains a subject of active research. This study utilizes steady-state and t…
Assessing the stability fields of molecular and polymeric CO2
Alexander F. Goncharov, Elena Bykova, Maxim Bykov +4
We investigated the stability of polymeric CO2 over a wide range of pressures, temperatures, and chemical environments. We find that the I-42d polymeric structure, consisting of a…
Phase transition kinetics revealed by in situ X-ray diffraction in laser-heated dynamic diamond anvil cells
Matthew Ricks, Arianna E. Gleason, Francesca Miozzi +7
We report on a novel approach to dynamic compression of materials that bridges the gap between previous static- and dynamic- compression techniques, allowing to explore a wide rang…
Structural evolution of iodine on approach to the monatomic state
Elena Bykova, Iskander G. Batyrev, Maxim Bykov +4
We applied single-crystal X-ray diffraction and Raman spectroscopy in a diamond anvil cell up to 36 GPa and first principles theoretical calculations to study the molecular dissoci…
Ultrastable Metallic Glass Nanoparticles with Size-Dependent Mechanical Properties
Abhinav Parakh, Mehrdad T. Kiani, Anabelle Colmenares +5
The atomistic structure of metallic glasses is closely related to properties such as strength and ductility. Here, Ni1-xBx metallic glass nanoparticles of two different sizes are c…
Comment on: Evidence and Stability Field of fcc Superionic Water Ice Using Static Compression
Alexander F. Goncharov, Vitali B. Prakapenka
Weck et al. (1) report on the existence and stability fields of two superionic (SI) phases of H2O ice at high P-T (P-T) conditions, which has been a topic of static and dynamic exp…
Universal diamond edge Raman scale to 0.5 terapascal: The implication to metallization of hydrogen
M. I. Eremets, V. S. Minkov, P. P. Kong +3
The recent progress in generating static pressures up to terapascal values opens opportunities for studying novel materials with unusual properties, such as metallization of hydrog…
Synthesis, structure and electric conductivity of higher hydrides of ytterbium at high pressure
Tomasz Jaronn, Jianjun Ying, Marek Tkacz +4
While most of the rare earth metals readily form trihydrides, due to increased stability of the filled 4f electronic shell for Yb(II), only YbH, formally corresponding to…
High pressure induced precipitation in Al7075 alloy
Abhinav Parakh, Andrew C. Lee, Stella Chariton +4
Precipitate-matrix interactions govern the mechanical behavior of precipitate strengthened Al-based alloys. These alloys find a wide range of applications ranging from aerospace to…
Iron-rich Fe-O compounds with closest-packed layers at core pressures
Jin Liu, Yang Sun, Chaojia Lv +7
Oxygen solubility in solid iron is extremely low, even at high pressures and temperatures. Thus far, no Fe-O compounds between Fe and FeO endmembers have been reported experimental…
Synthesis and structure of carbon doped H3S compounds at high pressure
Alexander F. Goncharov, Elena Bykova, Maxim Bykov +4
Understanding of recently reported putative close-to-room-temperature superconductivity in C-S-H compounds at 267 GPa demands reproducible synthesis protocol as well as knowledge o…
Ethane and methane at high pressures: structure and stability
Elissaios Stavrou, Alexander A. Maryewski, Sergey Lobanov +4
We have performed a combined experimental and theoretical study of ethane and methane at high pressures up to 120 GPa at 300 K using x-ray diffraction and Raman spectroscopy and th…
High-Pressure Na3(N2)4, Ca3(N2)4, Sr3(N2)4, and Ba(N2)3 Featuring Nitrogen Dimers with Non-Integer Charges and Anion-Driven Metallicity
Dominique Laniel, Bjoern Winkler, Timofey Fedotenko +12
Charged nitrogen dimers are ubiquitous in high-pressure binary metal-nitrogen systems. They are known to possess integer formal charges x varying from one through four. Here, we pr…
Ultra-high pressure disordered eight-coordinated phase of MgGeO: Analogue for super-Earth mantles
Rajkrishna Dutta, Sally J. Tracy, Ronald E. Cohen +9
Mg2GeO4 is an analogue for the ultra-high pressure behavior of Mg2SiO4, so we have investigated magnesium germanate to 275 GPa and over 2000 K using a laser-heated diamond anvil ce…
High-pressure synthesis of Dirac materials: layered van der Waals bonded BeN polymorph
Maxim Bykov, Timofey Fedotenko, Stella Chariton +17
High pressure chemistry is known to inspire the creation of unexpected new classes of compounds with exceptional properties. Here we report the synthesis at ~90 GPa of novel beryll…
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…
Polymorphism of superionic ice
Vitali B. Prakapenka, Nicholas Holtgrewe, Sergey S. Lobanov +1
Water is abundant in natural environments but the form it resides in planetary interiors remains uncertain. We report combined synchrotron X-ray diffraction and optical spectroscop…
Novel rhenium carbides at 200 GPa
Saiana Khandarkhaeva, Timofey Fedotenko, Maxim Bykov +7
Laser heating of rhenium in a diamond anvil cell to 3000 K at about 200 GPa results in formation of two previously unknown rhenium carbides, hexagonal WC-type structured ReC and or…
B1-B2 phase transition in MgO at ultra-high static pressure
Natalia Dubrovinskaia, Sylvain Petitgirard, Stella Chariton +6
Studies of the behaviour of solids at ultra-high pressures, those beyond 200 GPa, contribute to our fundamental understanding of materials properties and allow an insight into the…
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…