A5059839290- High-pressure geophysics and materials
- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Boron and Carbon Nanomaterials Research
- Geological and Geochemical Analysis
- Rare-earth and actinide compounds
- Crystal Structures and Properties
- Advanced Chemical Physics Studies
- Advanced materials and composites
- X-ray Diffraction in Crystallography
- Material Dynamics and Properties
- MXene and MAX Phase Materials
- Advanced ceramic materials synthesis
- Force Microscopy Techniques and Applications
- Advanced Condensed Matter Physics
- Nuclear Materials and Properties
- High-Velocity Impact and Material Behavior
- Chemical Thermodynamics and Molecular Structure
- Luminescence Properties of Advanced Materials
- Superconductivity in MgB2 and Alloys
- Smart Grid Security and Resilience
- Inorganic Fluorides and Related Compounds
- Energetic Materials and Combustion
- Geophysics and Sensor Technology
- Ultrasonics and Acoustic Wave Propagation
Zhengzhou University
2025
Hong Kong Baptist University
2024-2025
Chongqing Institute of Green and Intelligent Technology
2025
Institute of Fluid Physics
2009-2023
Institute of High Energy Physics
2008-2023
Center for High Pressure Science and Technology Advanced Research
2018-2023
Center for High Pressure Science & Technology Advanced Research
2019
China Academy of Engineering Physics
2002-2018
Chinese Academy of Engineering
2011-2014
Jilin University
2012-2013
The average measured Hv for polycrystalline ReB2 and Ti–B composites under different loads shows that the tendency of to decrease becomes weak large loads, hardness is always lower than composites. For comparison, results from Chung et al. were inserted into figure.
Here, we report the sintering of aggregated submicron cubic boron nitride (sm-cBN) at a pressure 8 GPa. The sintered cBN compacts exhibit hardness values comparable to that single crystal diamond, fracture toughness about 5-fold crystal, in combination with high oxidization temperature. Thus, another way has been demonstrated improve mechanical properties besides reducing grain size nano scale. In contrast other ultrahard similar hardness, sm-cBN aggregates are better placed for potential...
A pressure sensor of SrB4O7:Sm2+ has been synthesized and the shift its 7D0-5F0 fluorescence line recalibrated at room temperature up to 48 GPa 127 hydrostatically non-hydrostatically, respectively. Different from previous study, our results show that calibrated relation in quasi-hydrostatic environment is quite different non-hydrostatic environment. The yield strength as a function determined by gradient method diamond anvil cell. increases 2.85 7.9 4.22 25.4 much smaller than ruby....
As correlation strength has a key influence on the simulation of strongly correlated materials, many approaches have been proposed to obtain parameter using first-principles calculations. However, comparison different Coulomb strengths obtained these and an investigation mechanisms behind them are still needed. Taking lanthanide metals as example, we research factors that affect effective interaction strength, Ueff, by local screened correction (LSCC), linear response (LR), constrained...
A one-step sintering process is developed to prepare nanostructured super-hard B6O?B4C compacts (see figure) from a mixture of B, B2O3, and B4C precursors at mild pressure ∼3GPa high temperatures ranging 1500–1900 K. The sintered B6O–B4C exhibit hardness values comparable commercially available polycrystalline BN are used for the high-speed cutting hardened steel.
The communication network plays an increasingly important function in the Cyber-Physical Distribution System (CPDS) to ensure a dependable power supply as quantity and type of terminal devices distribution systems increase.This article examines CPDS reliability context wireless access conditions. We begin by developing model specifically for channels within 5G network. Additionally, we introduce enhanced evaluation method using improved minimal path approach. Simulation results demonstrate...
Due to its distinctive two-dimensional structure and high specific surface area, graphene oxide (GO) is expected be a very promising material used for membrane separation. Not only can it improve the mechanical strength, wettability, thermal stability of membrane, but also filtration performance shelf life polymer membrane. Graphene oxide/poly(meta-phenylene isophthalamide) (GO/PMIA) nanofiber membranes were prepared by means an electrospinning technique. The effects adding different amounts...
The electrical conductivity of shock-compressed iron was measured up to 208 GPa by using an improved sample assembly in which the is encapsulated a single-crystal sapphire cell. High-pressure shock compressions were generated plate impact with two-stage light-gas gun. varies from 1.45 × 104 Ω −1 cm−1 at 101 and 2010 K, 7.65 103 Ω−1 5220 K. After analysing these data together those reported previously, we found that Bloch–Grüneisen expression valid for ε-iron pressure temperature range
High-energy synchrotron x-ray diffraction was utilized to study the local order of liquid sulfur at high-pressure and high-temperature conditions. A temperature driven structure change in observed, signified by an magnitude reduction lengths chains. The large chain length implies that this is a liquid-liquid phase transition sulfur. breakage may strongly influence physical properties, such as semiconductor-metal drastic decrease viscosity across transition.
The tin β–γ–liquid triple point and the melting curve at high pressure have been controversial for a long time. Apart from being of fundamental importance, sound velocity temperature also provides practical approach determining curves phase boundaries. We investigated velocities diagram up to 5 GPa 800 K by ultrasonic measurements on multi-anvil apparatus. obtained in this work is 3.02 ± 0.05 562 2 K. experimental data extrapolated γ using Simon-type equation are good agreement with...
We present a simple but accurate scheme to compute the thermodynamic properties of crystalline solids in wide range pressure and temperature based on ab initio calculations. Compared method thermodynamic-integration techniques, our approach can reduce dramatically number molecular-dynamics simulations needed calculations intrinsic anharmonic effect neglected conventional quasiharmonic approximation. Taking tungsten as an example, we show that its thermal including linear thermal-expansion...
Gold powder is compressed non-hydrostatically up to 127 GPa in a diamond anvil cell (DAC), and its angle dispersive X-ray diffraction patterns are recorded. The compressive strength of gold investigated framework the lattice strain theory by line shift analysis. result shows that increases continuously with pressure 106 reaches 2.8 at highest experimental (127 GPa) achieved our study. This good agreement previous relevant range. may be major source error equation-of-state measurement various...
Valence transition could induce structural, insulator-metal, nonmagnetic-magnetic and superconducting transitions in rare-earth metals compounds, while the underlying physics remains unclear due to complex interaction of localized $4f$ electrons as well their coupling with itinerant electrons. The valence elemental metal europium (Eu) still has remained a matter debate. Using resonant x-ray emission scattering diffraction, we pressurize states Eu study its structure up 160 GPa. We provide...
Effect of non-hydrostatic stress on X-ray diffraction in a diamond anvil cell (DAC) is studied. The pressure gradient the sample chamber leads to broadening peaks, which increase with hkl index crystal. It found that difference between determined d-spacing compressive ratio d/d0 and real dr/d0 by yield transmitting media (if used) shear modulus sample. On basis corrected experiment data Mao et al. (MXB86), was used calibrate most widely ruby fluorescence scale, new relationship scale...
The pressure dependence of the yield strength tantalum was investigated experimentally up to 101 GPa at room temperature using a diamond anvil cell. A softening is observed between 52 and 84 GPa, whereas normal trend below above GPa. onset in agreement with previous results obtained by gradient method shock wave experiments. This unusual not related structural transformation, preferred orientation, or material damage. Our measurements indicate that microscopic deviatoric strain major reason...
As a widely used pressure calibrator, the structural phase transitions of bismuth from I, to II, III, and then V with increasing at 300 K have been confirmed. However, there are different versions for most which determined by x-ray diffraction (XRD) technology. Using absorption fine structure (XAFS) measurements combined ab initio calculations, we show that proposed incommensurate composite three configurations is best option. An abnormal continuous increase nearest-neighbor distance III...
The thermal equation of state fcc platinum has been evaluated by using the full-potential linear muffin-tin orbital (FPLMTO) total-energy method combined with a mean-field model vibrational partition function for pressures up to $1000\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and temperatures $10\phantom{\rule{0.2em}{0ex}}000\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. at zero temperature was computed FPLMTO. For finite temperatures, contributions were obtained computing particle in cell mean field...
In the diamond anvil cell technology, pressure gradient approach is one of three major methods in determining yield strength for various materials at high pressures. present work, by situ measuring thickness sample foil, we have improved traditional technique this method. Based on modification, molybdenum pressures has been measured. Our main experimental conclusions are as follows: (1) The measured data samples with different initial (100, 250, and 500 microm) good agreement above a peak 10...