A5064005899- Thermal Expansion and Ionic Conductivity
- Microwave Dielectric Ceramics Synthesis
- Topological Materials and Phenomena
- Ferroelectric and Piezoelectric Materials
- Graphene research and applications
- Magnetic and transport properties of perovskites and related materials
- Advanced Battery Materials and Technologies
- Thermodynamic and Structural Properties of Metals and Alloys
- 2D Materials and Applications
- Advancements in Battery Materials
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Nuclear Physics and Applications
- Erythrocyte Function and Pathophysiology
- Nuclear reactor physics and engineering
- Gold and Silver Nanoparticles Synthesis and Applications
- Tuberculosis Research and Epidemiology
- Semiconductor materials and devices
- Nuclear Materials and Properties
- Quantum Dots Synthesis And Properties
- Nuclear materials and radiation effects
- Magnetic Properties and Synthesis of Ferrites
- Radiation Detection and Scintillator Technologies
- Crystal Structures and Properties
- Quantum and electron transport phenomena
Beihang University
2015-2024
Anhui University of Traditional Chinese Medicine
2024
Zhejiang International Studies University
2024
China Institute of Atomic Energy
2012-2021
Shandong Normal University
2018-2020
NIST Center for Neutron Research
2012
University of Chinese Academy of Sciences
2007-2008
Fujian Institute of Research on the Structure of Matter
2004
Chinese Academy of Sciences
2002
Shanghai Institute of Ceramics
2002
Decreasing Li/Ni disorder has been a challenging problem for layered oxide materials, where seriously restricts their electrochemical performances lithium-ion batteries (LIBs). Element doping is great strategy that widely used to stabilize the structure of cathode material an LIB and improve its performance. On basis results previous studies, we hypothesized element Ca, which lower valence state larger radius compared Ni2+, would be ideal decrease LiMO2 materials enhance performances. A...
Neutron diffraction is used to reveal the origin and control of thermal expansion properties cubic intermetallic compounds Mn${}_{3}$Zn${}_{x}$N Mn${}_{3}$[Zn-(Ag,Ge)]${}_{x}$N. We show that introduction Zn vacancies induces stabilizes an antiferromagnetic phase with huge spin-lattice coupling can be tuned achieve zero (ZTE) over a wide temperature range. further ordering (${T}_{N}$) controls this ZTE by chemical substitution, again on site, adjust span temperatures from well above room...
We investigate the effect of a vertical electric field on Dirac semimetal thin film. show that through interplay between quantum confinement and field-induced coupling sub-bands, sub-band gap can be tuned inverted, during which system undergoes topological phase transition trivial band insulator spin Hall insulator. Consequently, one electrically switch edge channels off, making promising platform for constructing transistor.
The clarity of relationship between structure and electrochemical properties layered materials possesses important guiding significance.
As a new atomically layered, two-dimensional material, tin (IV) diselenide (SnSe₂) has attracted extensive attention due to its compelling application in electronics and optoelectronics. However, the great challenge of impurities preparation high-quality ultrathin SnSe₂ nanoflakes hindered far-reaching research practical applications so far. Therefore, facile chemical vapor deposition (CVD) method is employed synthesize large-scale flakes on mica substrates using SnSe Se powder as...
Abstract Molecular graphene provides an attractive man‐made artificial system to realize designer Dirac fermions with exotic properties and significant implications in electronics/spintronics, but its large‐scale fabrication remains a challenge as the available approach involves molecule‐by‐molecule manipulation of CO on metal surface using scanning tunneling microscopy tip. Here, we propose epitaxial growth molecular alloy, where molecules could be naturally self‐assembled into hexagonal...
Combining in-depth neutron diffraction and systematic bulk studies, we discover that the √5 × Fe vacancy order, with its associated block antiferromagnetic is ground state varying occupancy ratios of iron 16i 4d sites across phase-diagram KxFe2−ySe2. The orthorhombic one four vacant, appears only at intermediate temperatures as a competing phase. material experiences an insulator to metal crossover when order highly developed. Superconductivity occurs in such metallic
Nickel-rich layered cathode materials have aroused widespread interest due to their high discharge capacity, which is a basic requirement for next-generation energy density lithium batteries. However, with the increase of nickel content, face serious challenge capacity degradation, attributed formation rock salt-type oxides such as NiO on surface particles. To overcome this shortcoming, novel Ni concentration gradient LiNi0.8Co0.15Al0.05O2 (NCG-NCA) material was successfully synthesized...
The nuclear and magnetic structures of the cubic antiperovskite compound Mn3NiN are studied using neutron powder diffraction as a function temperature applied field. On cooling in zero field from paramagnetic state, an anomalous lattice expansion abruptly occurs long range antiferromagnetic order first develops below TN = 262 K. structure has lower symmetry than crystal can be conveniently described by rhombohedral R-3 with dimension √2ac × √3ac, where ac is chemical unit cell. In this...
Polycrystalline and monocrystalline α-BiFeO3 crystals have been synthesized by solid state reaction flux growth method, respectively. X-ray, neutron, electron diffraction techniques are used to study the crystallographic magnetic structure of α-BiFeO3. The present data show that crystallizes in space group P1 with a = 0.563 17(1) nm, b 84(1) c 70(1) α 59.33(1)°, β 59.35(1)°, γ 59.38(1)°, can be described modulation vector reciprocal q 0.0045a* - 0.0045b*, which is model proposed I. Sosnowska...
Point defects in semiconductors usually act as nonradiative charge carrier recombination centers, which severely limit the performance of optoelectronic devices. In this work, by combining time-domain density functional theory with nonadiabatic molecular dynamics simulations, we demonstrate suppressed and prolonged lifetime two-dimensional (2D) ReX2 (X = S, Se) S/Se vacancies. particular, a S vacancy introduces shallow hole trap state ReS2, while Se both electron states ReSe2. Photoexcited...
Abstract Two‐dimensional (2D)‐layered semiconductor materials have attracted considerable attention in surface‐enhanced Raman scattering spectroscopy (SERS) technology owing to their high uniformity, excellent reproducibility, and ultra‐flat surfaces without dangling bonds. However, they are rarely used the UV laser‐excited (UV–SERS) field. In this article, 2D‐layered tin diselenide (SnSe 2 ) nanoflakes were investigated as a UV–SERS substrate for first time. The strong absorption region of...
The structures and thermal expansion properties of Lu2−xFexMo3O12 have been investigated by X-ray diffraction (XRD). XRD patterns at room temperature indicate that compounds with x ≤ 1.3 exhibit an orthorhombic structure space group Pnca; = 1.5 1.7 a monoclinic P21/a. Studies on show the linear coefficients phase vary from negative to positive increasing Fe content. Attempts make zero materials can be observed in Lu1.3Fe0.7Mo3O12 range 200–400 °C.
The crystal and magnetic structures of antiperovskite compounds Mn3SnC, Mn3Sn0.95C0.9, Mn3Sn0.93Si0.07C0.94 were studied as a function temperature field by neutron powder diffraction. For the induces dramatic variation antiferromagnetic moment lattice parameter. Because this spin-lattice coupling, "square" (AFM) structure plays key role in inducing negative thermal expansion material. Moreover, parameter is closely related to rate change AFM moment, which can be controlled introducing...
The crystal structures, phase transition, and thermal expansion behaviors of solid solutions Sc2–xFexMo3O12 (0 ≤ x 2) have been examined using X-ray diffraction (XRD), neutron powder (NPD), differential scanning calorimetry (DSC). At room temperature, samples crystallize in a single orthorhombic structure for the compositions < 0.6 monoclinic ≥ 0.6, respectively. DSC results indicate that transition temperature from to is enhanced by increasing Fe3+ content. High-temperature XRD NPD show...