A5029624333- High-pressure geophysics and materials
- Crystallography and molecular interactions
- Microstructure and mechanical properties
- Nuclear materials and radiation effects
- Microwave Dielectric Ceramics Synthesis
- Crystal Structures and Properties
- Geological and Geochemical Analysis
- Phase Equilibria and Thermodynamics
- Diamond and Carbon-based Materials Research
- Layered Double Hydroxides Synthesis and Applications
- Pigment Synthesis and Properties
- Carbon Nanotubes in Composites
- Inorganic Chemistry and Materials
- Thermal and Kinetic Analysis
- Inorganic Fluorides and Related Compounds
- Energetic Materials and Combustion
- Magnesium Oxide Properties and Applications
- Advanced ceramic materials synthesis
- Spectroscopy and Laser Applications
- Surface Treatment and Residual Stress
- Metallurgy and Cultural Artifacts
- Advanced Condensed Matter Physics
- Magnetism in coordination complexes
- Ion-surface interactions and analysis
- Boron and Carbon Nanomaterials Research
Institute of Geochemistry
2023
Chinese Academy of Sciences
2023
Peking University
2017-2022
Western University
2013-2021
Ministry of Education of the People's Republic of China
2018
Center for High Pressure Science and Technology Advanced Research
2013-2017
The high pressure behaviors of hydrate Cu-BTC metal–organic framework (MOF) in terms phase stability, compressibility and reversibility were investigated <italic>in situ</italic> by synchrotron X-ray powder diffraction as well vibrational spectroscopy.
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...
Significance In this paper, both oxygen and carbon K -edge spectra of CO 2 polymorphs at high pressure room temperature were reported. The electronic structure shows remarkable change from molecular to nonmolecular transition. Furthermore, a 532-eV feature was observed only limited range ∼37 53 GPa, suggesting the presence transient species in phase.
The strength and texture of sodium chloride in the B1 (rocksalt) B2 (cesium chloride) phases were investigated a diamond anvil cell using synchrotron X-ray diffraction radial geometry to 56 GPa. measured differential stresses within Reuss limit are range 0.2 GPa for phase at pressure 24 1.6 A weakening is observed near B1-B2 transition about 30 low NaCl confirms that it an effective pressure-transmitting medium high-pressure experiments ∼30 can be also used as although exhibits steeper...
Nanocrystalline magnesium aluminate was synthesized with the coprecipitation method. Its growing behaviors as a function of temperature were studied synchrotron X-ray diffraction (XRD) and Raman spectroscopy. It is found that particle growth greatly inhibited at temperatures below 1000 °C due to hydroxide precursor reactants. Above °C, nanoparticles start grow fast. After two hours annealing 1200 grain size changes by multiple folds, suggesting oriented attachment may occur. in various...
High-pressure structural and electronic transitions of SbI 3 under different hydrostatic environments were investigated using synchrotron X-ray diffraction, Raman spectroscopy, electrical conductivity first-principles theoretical calculations.
In this study, nitrogen-doped carbon nanotubes (CNx-NTs) with a 8.4% nitrogen content were investigated under high pressure using Raman spectroscopy as well X ray diffraction (XRD) synchrotron radiation. For comparison purpose, behaviors of (CNTs) without studied well. Two phase transformations identified in CNx-NTs, which can be assigned to tube shape change from circular ellipse-like and then flatten shape. strong contrast, no obvious transition was found CNTs. addition the change,...
A natural chromian spinel with the composition (Mg0.48(3)Fe0.52(3))(Fe0.06(1)Al0.28(1)Cr0.66(2))2O4 was investigated up to 15 GPa via synchrotron X-ray diffraction a diamond-anvil cell at room temperature. No phase transition clearly observed maximum experimental pressure. The pressure–volume data fitted third-order Birch–Murnaghan equation of state yielded an isothermal bulk modulus ( K T 0 ) 207(5) and its first pressure derivative ′ 3.2(7), or = 202(2) fixed as 4. With this new result...
In this paper, we introduced a method to measure grain rotation of nanomaterials under external stress using high pressure diamond anvil cell and the Laue microdiffraction technique at synchrotron facility. We used tungsten carbide marker crystals investigate activities 3 500 nm nickel media. Our results show that nanocrystals increase with finally tends stop lower pressure/stress level than nickel. higher magnitude nanocrystals. measurements an effective study especially in ultrafine
Abstract In situ high-pressure and high-temperature X-ray diffraction studies on magnesiochromite, MgCr2O4, a natural chromite, (Mg,Fe)(Al,Cr)2O4, using laser-heated diamond-anvil cell technique were performed at pressures to ~45 GPa. Our results MgCr2O4 ~15 GPa showed temperature-induced dissociation of Cr2O3+MgO below ~1500 K formation modified ludwigite (mLd)-type Mg2Cr2O5+Cr2O3 above K. Above 20 GPa, only single phase with the CaTi2O4-type structure was observed 1400–2000 A second-order...