A5012770810- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Crystal Structures and Properties
- earthquake and tectonic studies
- Nuclear materials and radiation effects
- Advanced Condensed Matter Physics
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Polyoxometalates: Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
- Mineralogy and Gemology Studies
- Quantum Dots Synthesis And Properties
- Ferroelectric and Piezoelectric Materials
- 2D Materials and Applications
- Quantum Information and Cryptography
- Luminescence Properties of Advanced Materials
- Microstructure and Mechanical Properties of Steels
- Sulfur-Based Synthesis Techniques
- Hydrogen Storage and Materials
- Photochromic and Fluorescence Chemistry
- Quantum and electron transport phenomena
- Nanocluster Synthesis and Applications
- Microwave Dielectric Ceramics Synthesis
- Minerals Flotation and Separation Techniques
- Metal-Organic Frameworks: Synthesis and Applications
Peking University
2016-2024
Ministry of Education of the People's Republic of China
2018-2024
Yangtze Normal University
2019-2020
China Automotive Battery Research Institute
2019
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
2012-2017
Jilin University
2012-2017
Jilin Medical University
2014
Dalian Maritime University
2012
A series of Si-bearing MgAl2O4-spinels were synthesized at 1500–1650 °C and 3–6 GPa. These spinels had SiO2 contents up to ~1.03 wt % showed a substitution mechanism Si4+ + Mg2+ = 2Al3+. Unpolarized Raman spectra collected from polished single grains, displayed set well-defined peaks ~610, 823, 856 968 cm−1 that not been observed before. Aided by the features natural Si-free MgAl2O4-spinel, synthetic low quartz, coesite, stishovite forsterite, we infer these should belong SiO4 groups. The...
Ringwoodite is an important mineral in the mantle transition zone, and its cationic disorder can profoundly affect physicochemical properties, but there currently much controversy about this disorder. In study, we investigate cation states of pure Mg2SiO4-ringwoodite defective ringwoodite under zone conditions through DFT calculations thermodynamic models. Two stable endmembers are seen, one with normal structure other inverted (its Si atoms half Mg have swapped sites). Our results indicate...
Raman spectroscopy, an ideal technique to quantify the Mg–Al cation distribution on tetrahedral T-sites and octahedral M-sites of MgAl2O4-spinel, was not calibrated before. By performing 16 annealing experiments some MgAl2O4-spinel crystal plates at P from 1 atm 5.0 GPa T 823 1873 K, a series samples with different magnitudes disorder (characterized by inversion parameter x, i.e., molar fraction Al cations T-sites) have been generated. Single-crystal X-ray diffraction analyses performed all...
Two new europium silicates, Na15Eu3Si12O36 (denoted as 1) and K2EuSi4O10F 2), were successfully synthesized under high-temperature high-pressure conditions, structurally characterized by single-crystal powder X-ray diffraction (XRD). The XRD analysis of 1 reveals that its structure is based on [Si6O18]n(12n-) cyclosilicate anions are built from six SiO4 tetrahedra sharing two their four O corners with each other. Such linked via EuO6 octahedra to form a three-dimensional (3D) framework...
The effects of Al3+–Fe3+ substitution on 10 synthesized garnet samples along the grossular–andradite binary solid solution were investigated using both powder and single-crystal X-ray diffraction. Results showed that cell volume increased with andradite content. Small negative excess was observed in Al-rich samples. By measuring bond length, polyhedral volume, octahedral distortion parameter (σ), tetrahedral rotation angle (α), we determined occurred dodecahedral site. width diffraction...
Bredigite with the composition Ca7MgSi4O16 (Ca7MgSi4O16-Bre) has been synthesized by a solid-state reaction method at 1.2 GPa and 1373 K for 7 days, its structure determined single-crystal X-ray diffraction data. Following relevant genealogy analysis in literature, we have refined into two space groups, Pnnm Pnn2, found that Ca7MgSi4O16-Bre belongs to group Pnnm, which can be essentially derived from Pnn2 via an atomic coordinate transformation (with average deviation of 0.039 Å only)....
MgAl2O4-spinel has wide industrial and geological applications due to its special structural physical–chemical features. It is presumably the most important endmember of complex natural spinel solid solutions, therefore provides a model for large group minerals with structure. There exists well known but still inadequately understood phenomenon in structure MgAl2O4-spinel, Mg–Al cations readily exchanging their positions response variations temperature, pressure, composition. A number...
The in-situ X-ray diffraction (XRD) and Raman spectra of synthetic (Mg, Fe, Mn)CO3 single crystals for (Mg0.37Fe0.31Mn0.32)CO3, (Mg0.49Fe0.51)CO3, (Fe0.47Mn0.53)CO3, (Mg0.50Mn0.50)CO3 were investigated up to 871 K. Lattice parameters the volumetric thermal expansion coefficients achieved, demonstrating an inherent anisotropy c/a near 3.0. our intermediate components all exhibit a negative temperature dependence similar that end members. external modes T, L, anti-symmetric stretching mode ν3,...
New terbium silicate Na<sub>2</sub>Tb<sub>1.08</sub>Ca<sub>2.92</sub>Si<sub>6</sub>O<sub>18</sub>H<sub>0.8</sub> was synthesized at high pressure condition. The structure and the photoluminescence properties were also investigated suggesting a strong green emission with lifetime 2.498(7) ms.
将钠基膨润土（Na-MMT）掺入磷钼酸/聚乙烯基吡咯烷酮（PMA/PVP）体系中,利用透射电子显微镜（TEM）、原子力显微镜（AFM）、红外光谱（FTIR）、热重-差热（TG-DTA）、紫外-可见吸收光谱（UV-Vis）、X射线光电子能谱（XPS）等手段对复合薄膜的结构、热稳定性和光致变色性能进行了研究.红外光谱结果表明keggin结构磷钼酸和聚乙烯吡咯烷酮的基本结构在复合膜中仍然存在,复合膜中高分子与质子结合,以阳离子的形式与杂多阴离子成盐.Na-MMT的掺杂未对复合膜中PVP和PMA间的相互作用产生影响,但其掺杂提高了复合膜的热稳定性.在紫外光照下,复合膜由无色变为蓝色,杂多酸被还原产生杂多蓝.Na-MMT的掺杂降低了复合膜的光致变色响应性,这是由于多酸分子与钠基膨润土之间发生阳离子交换作用导致的.
A series of Si-bearing MgAl2O4-spinels were synthesized at 1500-1650 &deg;C and 3&ndash;6 GPa. These spinels had SiO2 contents up to ~1.03 wt%, showed a substitution mechanism Si4+ + Mg2+ = 2Al3+. Unpolarized Raman spectra collected from polished single grains, displayed set well-defined peaks ~610, 823, 856 968 cm-1 which not been observed before. Aided with the features natural Si-free MgAl2O4-spinel, synthetic low quartz, coesite, stishovite forsterite, we infer that these should...
Aqueous CdS:Cu nanocrystals (NCs) have been successfully prepared under microwave irradiation conditions. It appears that these contain abundant copper ions in their central interior, and they can diffuse through the interface of CuS nucleus CdS coated layers via cation exchange processes. The crystal structure, shapes optical properties were determined by X-ray diffraction, high-resolution transmission electron microscopy, UVVis absorption photoluminescence spectroscopy analyses. structure...