A5070791197- Metallic Glasses and Amorphous Alloys
- Diamond and Carbon-based Materials Research
- Glass properties and applications
- High-pressure geophysics and materials
- Material Dynamics and Properties
- High Entropy Alloys Studies
- High-Temperature Coating Behaviors
- Metal and Thin Film Mechanics
- Electronic and Structural Properties of Oxides
- Semiconductor materials and interfaces
- Advanced Surface Polishing Techniques
- Magnetic and transport properties of perovskites and related materials
- Silicon and Solar Cell Technologies
- Theoretical and Computational Physics
- Thin-Film Transistor Technologies
- Advanced materials and composites
- Phase-change materials and chalcogenides
- Advancements in Battery Materials
- Boron and Carbon Nanomaterials Research
- Advanced Condensed Matter Physics
- Advanced ceramic materials synthesis
- Semiconductor materials and devices
- Inorganic Chemistry and Materials
- Magnetic properties of thin films
- Carbon Nanotubes in Composites
Center for High Pressure Science and Technology Advanced Research
2016-2025
Shanghai Advanced Research Institute
2024
Center for High Pressure Science & Technology Advanced Research
2021-2023
Lawrence Livermore National Laboratory
2017
Carnegie Institution for Science
2014-2016
Geophysical Laboratory
2014-2016
Stanford University
2013-2016
SLAC National Accelerator Laboratory
2013-2015
Zhejiang University
2008-2014
University of Oxford
2011
Abstract Polymorphism, which describes the occurrence of different lattice structures in a crystalline material, is critical phenomenon materials science and condensed matter physics. Recently, configuration disorder was compositionally engineered into single lattices, leading to discovery high-entropy alloys oxides. For these novel entropy-stabilized forms with extremely high structural stability, polymorphism still possible? Here by employing situ high-pressure synchrotron radiation X-ray...
Diamond owes its unique mechanical, thermal, optical, electrical, chemical, and biocompatible materials properties to complete sp 3-carbon network bonding. Crystallinity is another major controlling factor for properties. Although other Group-14 elements silicon germanium have complementary crystalline amorphous forms consisting of purely 3 bonds, 3-bonded tetrahedral carbon has not yet been obtained. In this letter, we combine high pressure in situ laser heating techniques convert glassy...
Developing light yet strong aluminum (Al)-based alloys has been attracting unremitting efforts due to the soaring demand for energy-efficient structural materials. However, this endeavor is impeded by limited solubility of other lighter components in Al. Here, we propose surmount challenge converting multiple brittle phases into a ductile solid solution Al-based complex concentrated (CCA) applying high pressure and temperature. We successfully develop face-centered cubic single-phase CCA, Al
As a fundamental property of material, density is controlled by the interatomic distances and packing microscopic constituents. The most prominent atomistic feature in metallic glass (MG) that can be measured its principal diffraction peak position (q1) observable x-ray, electron, or neutron diffraction, which closely associated with average distance first shell. Density (and volume) would naturally expected to vary under compression proportion cube one-dimensional distance. However, using...
Abstract As a new class of multi-principal component oxides with high chemical disorder, high-entropy (HEOs) have attracted much attention. The stability and tunability their structure properties are great interest importance, but remain unclear. By using in situ synchrotron radiation X-ray diffraction, Raman spectroscopy, ultraviolet–visible absorption ex high-resolution transmission electron microscopy, here we show the existence lattice distortion crystalline (Ce 0.2 La Pr Sm Y )O 2−δ HEO...
Significance This work establishes a general rule correlating the bulk properties [volume ( V )] with atomic structure information (principal diffraction peak position q 1 ) for metallic glasses, i.e., ∝(1/ 2.5 . It is shown that power law strictly followed by any glass its volume tuned pressure and/or composition. attributed to well-constrained change/modification inevitably happens during composition tuning of which brings insight into glasses.
Abstract Metallic glasses are expected to have quite tunable structures in their configuration space, without the strict constraints of a well-defined crystalline symmetry and large energy barriers separating different states crystals. However, effectively modulating structure metallic is rather difficult. Here, using complementary situ synchrotron x-ray techniques, we reveal thermal-driven structural ordering Ce 65 Al 10 Co 25 glass, reverse disordering process via pressure-induced...
A 4:1 (volume ratio) methanol–ethanol (ME) mixture and silicone oil are two of the most widely used liquid pressure-transmitting media (PTM) in high-pressure studies. Their hydrostatic limits have been extensively studied using various methods; however, evolution atomic structures associated with their emerging nonhydrostaticity remains unclear. Here, we monitor as functions pressure up to ∼30 GPa at room temperature situ synchrotron x-ray diffraction (XRD), optical micro-Raman spectroscopy,...
The pressure-induced high-temperature superconductivity(Tc) in nickelates La3Ni2O7-x has sparked significant interest to explore its superconductivity at ambient pressure.Lan+1NinO3n+1(n=2,3)adopts an orthorhombic structure with tilted NiO6 octahedra and undergoes a spin-density-wave(SDW) transition pressure, while the octahedral tilting SDW are suppressed by high pressure induces structural from tetragonal, high-Tc is achieved tetragonal structure. This widely believed be crucial for...
The discovery of high-temperature superconductivity in La3Ni2O7 and La4Ni3O10 under high pressure indicates that the Ruddlesden-Popper (RP) phase nickelates Rn+1NinO3n+1 (R = rare earth) is a new material family for superconductivity. Exploring other RP or hybrid has become an urgent interesting issue. Here, we report novel nickelate superconductor La5Ni3O11. La5Ni3O11 formed by alternative stacking with n=2 La2NiO4 n=1 along c axis. transport magnetic torque measurements indicate...
Evidence of superconductivity (SC) has recently been reported in pressurized La3Ni2O7 and La4Ni3O10, providing a new platform to explore high-temperature superconductivity. However, while zero resistance state observed, experimental characterization the superconducting properties nickelates is still limited experimentally challenging. Here, we present first full temperature dependence upper critical field Hc2 measurement La4Ni3O10 single crystal, achieved by combining high magnetic...
<title>Abstract</title> <bold>The discovery of high-temperature superconductivity in La</bold><sub><bold>3</bold></sub><bold>Ni</bold><sub><bold>2</bold></sub><bold>O</bold><sub><bold>7</bold></sub><bold> and La</bold><sub><bold>4</bold></sub><bold>Ni</bold><sub><bold>3</bold></sub><bold>O</bold><sub><bold>10</bold></sub><bold> under high pressure indicates that the Ruddlesden‒Popper (</bold><italic><bold>RP</bold></italic><bold>) phase nickelates...
The spin-orbit Mott insulator Sr_{3}Ir_{2}O_{7} provides a fascinating playground to explore insulator-metal transition driven by intertwined charge, spin, and lattice degrees of freedom. Here, we report high-pressure electric resistance resonant inelastic x-ray scattering measurements on single-crystal up 63-65 GPa at 300 K. material becomes confined metal 59.5 GPa, showing metallicity in the ab plane but an insulating behavior along c axis. Such unusual phenomenon resembles strange phase...
High-entropy oxides (HEOs) stabilize multiple cations in a single solid solution phase, providing new opportunity for property engineering almost infinite compositional space. The structural stability and tunability of HEO are great interest importance but has not been well understood, especially under pressure. Here, we studied the structure evolution rock salt phase (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O using situ synchrotron X-ray diffraction, pair distribution function, Raman spectroscopy up to...
Relaxation dynamics, as a key to understand glass formation and glassy properties, remains an elusive challenging issue in condensed matter physics. In this work, situ high-pressure synchrotron high-energy X-ray photon correlation spectroscopy has been developed probe the atomic-scale relaxation dynamics of cerium-based metallic during compression. Although sample density continuously increases, collective atomic motion initially slows down generally expected then counterintuitively...
Phase transitions in indentation induced Si-III/XII phases were investigated using a diamond anvil cell and nanoindentation combined with micro-Raman spectroscopy. The situ high pressure Raman results demonstrate that the Si-III Si-XII have very similar spectra, indicating their relative amount cannot be determined if they are both present sample. coexist indentations produced by nanoindenter on single crystalline silicon wafer as result of local residual compressive stresses near 1 GPa....
Recently, an irreversible polymorphic transition from face-centered cubic to hexagonal close-packing was surprisingly observed under high pressure in the prototype CoCrFeMnNi high-entropy alloys (HEAs) by various research groups. This unexpected phase brings new insights into stability of HEAs, and its irreversibility stimulates exploration for HEAs via high-pressure compression synthesis. However, onset reported fluctuate over a vast range ∼7 above 49 GPa experiments. The reason this...