A5100427408- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Diamond and Carbon-based Materials Research
- Microstructure and mechanical properties
- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Iron-based superconductors research
- Metal and Thin Film Mechanics
- Multiferroics and related materials
- Boron and Carbon Nanomaterials Research
- High-pressure geophysics and materials
- Carbon Nanotubes in Composites
- Force Microscopy Techniques and Applications
- Graphene research and applications
- Advanced materials and composites
- 2D Materials and Applications
- Rare-earth and actinide compounds
- Quantum Dots Synthesis And Properties
- Fullerene Chemistry and Applications
- Inorganic Chemistry and Materials
- Thermal Expansion and Ionic Conductivity
- Surface Treatment and Residual Stress
- Topological Materials and Phenomena
- Microstructure and Mechanical Properties of Steels
- Luminescence Properties of Advanced Materials
Center for High Pressure Science and Technology Advanced Research
2015-2024
Shanghai Advanced Research Institute
2024
Harbin Institute of Technology
2024
Guangzhou Institute of Geochemistry
2021
Chinese Academy of Sciences
2021
Jilin University
2021
Deutsches Elektronen-Synchrotron DESY
2021
Center for High Pressure Science & Technology Advanced Research
2021
Quaid-i-Azam University
2019
Shanghai Institute of Technical Physics
2019
Li-doped high-entropy oxides (Li-HEO) are promising electrode materials for Li-ion batteries. However, their electrical conduction in a wide range of temperatures and/or at high pressure is unknown, hindering applications under extreme conditions. Especially, clear understanding the mechanism needed. In this work, we determined carrier type several (MgCoNiCuZn)O semiconductor compounds and measured 79-773 K pressures up to 50 GPa. Three optical band gaps were uncovered from UV-vis-NIR...
Significance The plastic deformation of nanomaterials has long been wrapped in mystery. Grain rotation is suggested to be a dominant mechanism for ultrafine nanomaterials. However, the situ observation grain made possible only coarse-grained materials. Here we report high-pressure detection at nanoscale. surprising that texture strength same-sized platinum drops rapidly with decreasing size nickel medium, indicating more active occurs smaller nanocrystals. Insight into these processes...
Abstract Highly efficient energy storage is in high demand for next-generation clean applications. As a promising material, the application of Mn 2 O 3 limited due to its poor electrical conductivity. Here, high-pressure techniques enhanced conductivity significantly. In situ synchrotron micro X-Ray diffraction, Raman spectroscopy and resistivity measurement revealed that decreased with pressure dramatically dropped near phase transition. At highest pressure, reduced by five orders magnitude...
The force-electric effect in ferroelectrics is characterized by the release of bound charge during pressure/shock-induced depolarization. In contrast to other electrical energy storage systems, charge-storage/release determined polarization switching or polar-nonpolar phase transition. This offers a further set options for materials design realm conversion, especially high power density applications. Here, we report that ferroelectric ceramic,...
An unexpected superconductivity enhancement is reported in decompressed In 2 Se 3 . The onset of occurs at 41.3 GPa with a critical temperature ( T c ) 3.7 K, peaking 47.1 GPa. striking observation shows that this layered chalcogenide remains superconducting decompression down to 10.7 More surprisingly, the highest lower pressures 8.2 twofold increase same crystal structure as compression. It found evolution driven by pressure‐induced R ‐3 m I ‐43 d structural transition and significant...
Abstract Establishing condensed matters at their thermodynamically metastable or unstable structures demonstrates merit in the adjustability of electronic structures, benefiting discovery emerging new material functionalities and applications. Herein, a molten‐salt assisted heterogeneous nucleation approach is demonstrated to significantly improve effectiveness batch synthesis perovskites correlated oxides, such as rare‐earth nickelates ( Re NiO 3 ) with various compositions. In contrast...
We report an anomalous phase transition in compressed In2Se3. The high-pressure studies indicate that In2Se3 transforms to a new isosymmetric R-3m structure at 0.8 GPa whilst the volume collapses by ∼7%. This involves pressure-induced interlayer shear glide with respect one another. Consequently, outer Se atoms of sheet locate into interstitial sites three neighboring sheets are weakly connected van der Waals interaction. Interestingly, this changes stacking sequence significantly but leaves...
The conventional belief, based on the Read-Shockley model for grain rotation mechanism, has been that smaller grains rotate more under stress due to motion of boundary dislocations. However, in our high-pressure synchrotron Laue x-ray microdiffraction experiments, 70 nm nickel particles are found than any other size. We infer reversal size dependence arises from crossover between dislocation-mediated and interior deformation mechanisms. dislocation activities interiors evidenced by texture...
Mg1-xZnxFe2O4 (where x = 0.0, 02, 0.4, 0.5, 0.6 and 0.8) nanoparticles were synthesized using co-precipitation. A detailed investigation of the structural, electrical, magnetic optical properties was carried out for samples X-ray diffraction (XRD), current-voltage (I-V) measurements, vibrating sample magnetometer (VSM) Raman spectroscopy, respectively. Rietveld refinement fitting revealed that structure these is cubic spinel with space group Fd3m, lattice parameter decreases linearly...
Abstract Charge density wave (CDW) systems have been widely studied and proposed to be potential candidates for next‐generation electronic devices. However, the lack of room‐temperature CDW materials has limited development CDW‐based devices, thus finding a way manipulate transitions orders toward room temperature will importance. Room‐temperature above transition in 1 T ‐VSe 2 is reported. The found shift ≈114 K at 0.7 GPa, further compression enhances dramatically, reaching ≈358 14.6 GPa....
The importance of electronic structure evolutions and reconstitutions is widely acknowledged for strongly correlated systems. precise effect pressurized Fermi surface topology on metallization superconductivity a much-debated topic. In this work, an evolution from insulating to metallic behavior, followed by superconducting transition, systematically investigated in SnS2 under high pressure. In-situ X-ray diffraction measurements show the stability trigonal compression. Interestingly,...
The mechanism of plasticity in nanostructured Si has been intensively studied over the past decade but still remains elusive. Here, we used situ high-pressure radial x-ray diffraction to simultaneously monitor deformation and structural evolution a large number randomly oriented nanoparticles (SiNPs). In contrast $\ensuremath{\beta}$-Sn phase dominated observed SiNPs ($\ensuremath{\sim}100\text{ }\text{ }\mathrm{nm}$), small ($\ensuremath{\sim}9\text{ }\mathrm{nm}$) display simple hexagonal...
For around three decades, high-pressure techniques have been used to study nanomaterials. In most studies, especially the early ones, x-ray diffraction and Raman infrared spectroscopy were investigate structural transition equation of state. recent years, exploration has extended plastic deformation nanomaterials by using radial diamond-anvil-cell transmission electron microscopy. Compared with traditional techniques, are more advantageous in applying mechanical loads nanosized samples...
We report the superconductivity enhancement of ZrTe3 on compression up to 33 GPa. The superconducting transition occurs above 4.1 GPa and temperature (T C) increases with pressure in further compression, reaching a maximum 7.1 K at ~28 An anomalous change is seen 21 No structural phase observed whole 36 GPa, but subtle parameter between 17-19 which seems relevant increase temperature. First-principle calculations reveal that density states Fermi level pressure, explains T C under compression.
Temperature can control the degree of hydrogenation titania (i.e., black TiO2), determining defect chemistry and hence its optical absorption electrical conductivity that are key to photocatalytic activity. However, how pressure affects two factors is unknown. In this work, we used a diamond anvil cell produce required high (HP) studied dependences structure change, conductivity, light using HP X-ray diffraction, Raman/UV–vis spectroscopy, transport measurements. Results reveal accompanying...
The plastic deformation behaviors of crystalline materials are usually determined by lattice dislocations. Below a certain particle or grain size, focus is placed on the grain-boundary-mediated mechanisms (e.g., rotation, boundary sliding, and diffusion), which has been observed during recrystallization, growth, deformation. However, underlying rotation remain to be studied. In this article, we review theoretical models, molecular dynamics simulations, experimental investigations rotation....
Bi5Ti3FeO15 (BTFO) ceramics have been widely studied as a multiferroic material with some potential applications. However, the effect of stress field on BTFO complex lattice structures is unknown. Here, we use pressure-dependent Raman scattering spectroscopy to study structure/phase transition samples. Because phonon mode changes significantly, there could be phase in range 4.5–14.8 GPa. In order further prove occurrence transition, carried out situ high-pressure angular dispersion x-ray...
Abstract The properties of the emerging phosphochalcogenide compounds can be tuned by temperature, pressure, and chemical composition characterized compound entropy. However, it is unknown how entropy such a affects its structural stability material when state variable changes. In this work, new layered high‐entropy phosphoselenide (MnFeCuCdIn)PSe 3 (denoted MPSe ) prepared evolution property changes are studied at pressures up to ≈60 GPa. It found that undergoes two isostructural ≈10 20...
The study of orientation variant selection helps to reveal the mechanism and dynamic process martensitic transformations driven by temperature or pressure/stress. This is challenging due multiple variants which may coexist. While effects microstructure in many have been studied detail, stress pressure are much less understood. Here, an situ Mn2O3 across cubic-to-orthorhombic transformation explores at pressures up 51.5 GPa stresses 5.5 GPa, using diamond anvil cells radial geometry with...