A5101943883- Thermal Expansion and Ionic Conductivity
- Ferroelectric and Piezoelectric Materials
- Advanced Battery Materials and Technologies
- Magnetic and transport properties of perovskites and related materials
- Material Dynamics and Properties
- High-pressure geophysics and materials
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Astronomical Observations and Instrumentation
- Theoretical and Computational Physics
- Phase Equilibria and Thermodynamics
- Advanced Thermoelectric Materials and Devices
- Gas Sensing Nanomaterials and Sensors
- Water Treatment and Disinfection
- Optical Systems and Laser Technology
- Fire Detection and Safety Systems
- Functional Equations Stability Results
- Laser Design and Applications
- Rare-earth and actinide compounds
- Perovskite Materials and Applications
- Mathematical Dynamics and Fractals
- Magnetic Properties of Alloys
- Shape Memory Alloy Transformations
- Water Quality Monitoring Technologies
- Transition Metal Oxide Nanomaterials
Beijing Jiaotong University
2014-2025
Beihang University
2011-2018
Ludong University
2014-2018
The University of Tokyo
2014
NIST Center for Neutron Research
2014
Institute of Applied Physics and Computational Mathematics
2009
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...
The near zero temperature coefficient of resistivity (NZ-TCR) in Mn-based antiperovskite Mn3Ni1−xCuxN is reported. range NZ-TCR controllable by changing Cu content. Further, the TCR value 0.09 ppm K−1 was obtained Mn3Ni0.5Cu0.5N over a broad around room temperature. anomalous change from metal-like to behavioris apparently due magnetic transition. possible reason for formation interpreted on basis spin-disorder scattering.
The antiperovskite Mn3+xNi1–xN compounds have been synthesized and characterized by a variety of experimental techniques. After Mn doping at the Ni site, both ferromagnetic characteristics an Invar-like effect were observed in antiferromagnetic host material. behavior was assumed to be related characteristic magnetic structure induced doping. Neutron diffraction results prove that stabilizes special Γ5g phase with strong spin–lattice coupling can tuned achieve behavior. magnetovolume (MVE)...
A baromagnetic effect in a novel tetragonal magnetic structure is introduced by vacancies Mn3 Ga0.95 N0.94 , due to the change of Mn-Mn distance and their spin re-orientation induced pressure field. This proven for first time antiperovskite compounds neutron powder diffraction analysis. feature will enable wide applications magnetoelectric devices intelligent instruments.
NiTi alloy has excellent advantages in elastocaloric cooling due to its fatigue-resistant high performance and superelasticity. The piezoelectric material Pb(Zr0.52Ti0.48)O3 (PZT) is used actuators sensors for or inverse effect. In this research, the thin film was coated with PZT form a Ni49Ti51/PZT heterojunction by magnetron sputtering. effect of regulated electric field. trigger Ni49Ti51/PZT. This piezoelectric–elastocaloric coupling involved electrical, mechanical, thermal energy...
A novel scheme for the focusing of high-energy leptons in future linear colliders was proposed 2001 [P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)]. This has many advantageous properties over previously studied schemes, including being significantly shorter a given energy having better bandwidth. Experimental results from ATF2 accelerator at KEK are presented that validate operating principle such by demonstrating demagnification 1.3 GeV electron beam down to below 65 nm height...
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...
One of the specific subjects in frustrated magnetic systems is phenomenon coupled with noncollinear magnetism, such as zero or negative thermal expansion (ZTE NTE) antiperovskite compounds. The first-principles calculations and neutron powder diffraction (NPD) are used to reveal control Γ5g antiferromagnetic (AFM) structure corresponding properties Mn3Zn0.875X0.125N (X = Mn, Ge, Sn). Based on optimal exchange-correlation functional, our results demonstrate that X Sn) doping at Zn site could...
The magnetovolume effects (MVEs) of $\mathrm{M}{\mathrm{n}}_{3}\mathrm{G}{\mathrm{a}}_{1\ensuremath{-}x}\mathrm{S}{\mathrm{n}}_{x}\mathrm{N}$ antiperovskite compounds have been investigated by means neutron powder diffraction. Increasing the Sn-doping content at Ga site leads to broadening magnetic phase transition temperature range and thermal expansion behavior changes from negative positive. We establish relationship between square ordered moment ${m}^{2}$ volume variation...
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...
Extensive first-principle molecular dynamics simulations are performed to study the phase behavior of metastable liquid Si at negative pressure. Our results show that high-density (HDL) and HDL-vapor spinodals indeed form a continuous reentrant curve liquid-liquid critical point seems just coincide with its minimum. The line density maxima also has strong tendency pass through this behaviour therefore tends be critical-point-free scenario rather than second-critical-point one based on SW potential.
Abstract The relationship between structural order and water-like anomalies in tetrahedral liquids is still open. Here, first-principle molecular dynamics are performed to study it metastable liquid Si. It found that T - P phase diagram, there indeed exists a anomaly region, which encloses density but not diffusivity anomaly. This consistent with of SW Si BKS SiO 2 different from SPC/E water. Two-body excess entropy can neither capture the diffusivity, structural, anomalies, as two-scale...
It was recently reported in experiments that at temperatures below 2500 K liquid nitrogen (N) remains molecular up to 120 GPa [Phys. Rev. Lett. 119, 235701 (2017)], which contradicts a liquid-liquid transition 88 and 2000 predicted by PBE-GGA density functional. To clarify this, we perform extensive first principles dynamics using SCAN meta-GGA functional, captures the intermediate-range part of van der Waals interaction better than PBE-GGA. is found gives more accurate bond energy length an...