A5026246649- Thermal Expansion and Ionic Conductivity
- Ferroelectric and Piezoelectric Materials
- Advanced Battery Materials and Technologies
- Magnetic and transport properties of perovskites and related materials
- Electronic Packaging and Soldering Technologies
- Advanced Thermoelectric Materials and Devices
- Geotechnical Engineering and Soil Mechanics
- Semiconductor materials and interfaces
- Hydraulic Fracturing and Reservoir Analysis
- Layered Double Hydroxides Synthesis and Applications
- Optical Systems and Laser Technology
- Drilling and Well Engineering
- Magnetic Properties of Alloys
- Fluid Dynamics and Heat Transfer
- Spacecraft and Cryogenic Technologies
- Geotechnical Engineering and Underground Structures
- Infrared Target Detection Methodologies
- 3D IC and TSV technologies
- Dam Engineering and Safety
- Advanced Semiconductor Detectors and Materials
- Rare-earth and actinide compounds
- Magnesium Oxide Properties and Applications
- Rock Mechanics and Modeling
- Recycling and Waste Management Techniques
- Microwave Dielectric Ceramics Synthesis
Sichuan University
2023
Harbin Normal University
2020-2023
Beihang University
2014-2020
Multiconsult (Norway)
2020
University of Greenwich
2002-2003
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.
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...
Zero thermal expansion (ZTE) is one of the most fascinating phenomena in condensed-matter physics due to its strong correlation essence and great application prospect. However, origin ZTE remains elusive it becomes an overwhelming challenge realize controllable design for which magnetic interaction plays a key role. In this work, with help neutron powder diffraction analysis, noncoplanar $[\frac{1}{2},\frac{1}{2},\frac{1}{2}]$ antiferromagnetic (AFM) phase experimentally obtained...
In the past decades, families of negative thermal expansion (NTE) materials have been in uninterrupted growth with more new NTE reported; particular, metal fluorides as members begin to draw attention. Herein, recent progress on properties is reviewed, including compounds, mechanisms and control expansion. Although some achievements made, there are still great development prospects. More in-depth investigations behavior expected.
Abstract The negative thermal expansion ( NTE ) and structural evolution of antiperovskite compounds Mn 3 Ga 1− x Ge N (0 ≤ 1.0) were systematically investigated. Our results indicate the crystal structure changes from cubic C to tetragonal T 4 with increasing content by X‐ray diffraction XRD ).The = 0 (operation‐temperature range ▵ 20 K) 0.4 (▵ 60 becomes broad shifts higher temperature, then it became positive 0.5 in N. Typically, shows low behavior between 300 450 K (∆ 150 K), coefficient...
Fe-doped MnNiGe alloys were successfully synthesized by solid-state reaction. Giant negative thermal expansion (NTE) behaviors with the coefficients of (CTE) -285.23 × 10-6 K-1 (192-305 K) and -1167.09 (246-305 have been obtained in Mn0.90Fe0.10NiGe MnNi0.90Fe0.10Ge, respectively. Furthermore, these materials combined Cu order to control NTE properties. The results indicate that absolute value CTE gradually decreases increasing contents. In Mn0.92Fe0.08NiGe/x%Cu, changes from -64.92 (125-274...
We present the first‐principles investigation of ( x ≤ 0.375). Controllable thermal expansion is achieved by different Ti contents. The negative (NTE) behavior weakened gradually with increasing content, which consistent experimental measurements. Jahn–Teller effect plays an important role in cubic‐to‐rhombohedral phase transition, stems from enhanced energy stability when 3 d orbitals cation split into triply degenerate and sets. unusual stiffening found, similar to that but contrary other...
Abstract We synthesized antiperovskite Mn 3 Ga 1− x Fe N (0 ≤ 0.30) compounds and investigated their negative thermal expansion (NTE) behavior, structure, magnetic properties. A high‐resolution transmission electron microscopy analysis a selected‐area diffraction (SAED) pattern indicate that the samples have high crystallinity with single‐phase cubic structure. Tunable NTE behavior appears below room temperature, operation temperature range (△ T ) is broadened while increasing doping....
Materials featuring negative thermal expansion (NTE) attract attention due to their numerous applications in printed circuit boards, machinery, optical-fiber reflective grating devices, and high-precision mirrors. Unfortunately, most large samples of NTE material are very sensitive external magnetic fields. To address this stumbling block, the authors chemically modify CrAs, which can turn antiferromagnetic thus field-insensitive, obtain a coefficient across range that includes room...
In this work, Mn 3 PtN[Formula: see text] (x = 0, 0.25, 0.5, 0.75 and 1.0) compounds were prepared by solid state reaction method. The structure, magnetic properties thermal expansion behaviors of with different nitrogen content systematically investigated. PtN has typical antiperovskite cubic structure space group Pm-3m (221). With decreasing content, the crystal changes to hexagonal P63/mmc when value x decreases then back Fm3m at 0. All obtained compound exhibit transition from...
The Mn3CuN/n-Si heterojunction device is first designed in the antiperovskite compound, and excellent rectifying characteristics are obtained. rectification ratio (RR) reaches as large 38.9 at 10 V, open-circuit voltage Voc of 1.13 V observed under temperature 410 K. behaviors can be well described by Shockley equation, indicating existence a Schottky diode. Simultaneously, particular semiconductor–metal transition (SMT) behavior 250 K also heterojunction. interfacial band bending induced...
The Mn3Sn1-xCoxC1.1 compounds are synthesized by a solid-state reaction method. effects of Co doping on the magnetic properties, phase transition and entropy change investigated in compounds. Curie temperature first decreases from 283 K to 212 (Mn3Sn0.9Co0.1C1.1) with increasing concentration, then increases 332 (Mn3Sn0.2Co0.8C1.1) further concentration Mn3Sn1-xCoxC1.1. first-order gradually changes into second-order transition, mean time, region broadens 9 300 content. Both broadening span...
This paper describes modelling technology and its use in providing data governing the assembly subsequent reliability of electronic chip components on printed circuit boards (PCBs). Products such as mobile phones, camcorders, intelligent displays, etc., are changing at a tremendous rate, where newer technologies increasingly being applied to satisfy demands for smaller products with increased functionality. At ever decreasing dimensions, increasing number input/output connections, design...
Admittance Spectroscopy (AS) measurements have been performed on n+-on-p Hg1-xCdxTe(x=0.6) photodiodes. Before gamma-irradiation, a deep level located 0.15 eV above the valence band is observed, its trap density Nt=4.8×1015cm-3 with capture cross section of approximately 2.2×10-17cm2, which probablely induced by compound defect correlated Hg vacancy. After 104 Gy new center 0.19 found, and pre-irradiation no longer seen. The densities for these two levels are almost same. This change...