A5007976593- Thermal Expansion and Ionic Conductivity
- Advanced Battery Materials and Technologies
- Ferroelectric and Piezoelectric Materials
- Magnetic and transport properties of perovskites and related materials
- Advanced Thermoelectric Materials and Devices
- Microwave Dielectric Ceramics Synthesis
- Thermal properties of materials
- Thermodynamic and Structural Properties of Metals and Alloys
- Inorganic Chemistry and Materials
- Phase Change Materials Research
- Shape Memory Alloy Transformations
- Rare-earth and actinide compounds
- Adsorption and Cooling Systems
- Transition Metal Oxide Nanomaterials
- CCD and CMOS Imaging Sensors
- High-pressure geophysics and materials
- Analog and Mixed-Signal Circuit Design
- Magnesium Oxide Properties and Applications
- Aluminum Alloys Composites Properties
- Multiferroics and related materials
- Perovskite Materials and Applications
- Advancements in Photolithography Techniques
- Seismic Waves and Analysis
- Thermal Radiation and Cooling Technologies
- Organic and Molecular Conductors Research
Chinese Academy of Sciences
2016-2025
University of Science and Technology of China
2024-2025
Institute of Solid State Physics
2015-2024
Beijing National Laboratory for Molecular Sciences
2024
Institute of Chemistry
2024
University of Chinese Academy of Sciences
2024
China University of Mining and Technology
2023
State Key Laboratory of Coal Resources and Safe Mining
2023
Hefei University
2015-2020
State Council of the People's Republic of China
2015
Abstract Emerging caloric cooling technology provides a green alternative to conventional vapor-compression which brings about serious environmental problems. However, the reported materials are much inferior their traditional counterparts in capability. Here we report barocaloric (BC) effect associated with liquid-solid-transition (L-S-T) n -alkanes. A low-pressure of ~50 MPa reversibly triggers an entropy change ~700 J kg −1 K , comparable those commercial refrigerants vapor-based...
Thickness is a very important parameter to control the microstructures, as well physical properties in multiferroic BiFeO 3 thin films. In this article, films with different thickness (from 210 830 nm) are fabricated by chemical solution deposition on Pt/Ti/SiO 2 /Si (100) substrates investigate effects systematically. The results show that crystallization improved, dielectric constant enhanced, and leakage current reduced increasing thickness. On other hand, magnetization magnetodielectric...
The nature of spin-glass behavior and zero-field-cooled exchange bias antiperovskite PdNCr<sub>3</sub>has been confirmed<italic>via</italic>the combination experiment measurements theoretical calculations.
The local distortion indicated by the split of Cu/Sn-Mn bonds for negative thermal expansion (NTE) materials Cu1−xSnxNMn3 (x = 0.1 and 0.5) was observed using neutron pair distribution function. upon Sn doping is suggested to be attributable fluctuation in hybridization Mn d with p orbitals. Accordingly, antiferromagnetic (AFM) coupling mediated p-d fluctuates strength. Consequently, AFM transition closely coupled volume change broadened, leading NTE.
For ferromagnets, varying from simple metals to strongly correlated oxides,the critical behaviors near the Curie temperature (TC) can be grouped into several universal classes. In this paper, we report an unusual behavior in manganese nitrides Cu1-xNMn3+x(0.1<x<0.4). Although below TC well described by mean field (MF) theory, robust fluctuations beyond expectations of any classes are observed above x=0.1. The become weaker when x increases, and MF-like is finally restored at x=0.4. addition,...
MnM′X (M′ = Co, Ni; X Ge, Si, etc.) alloys usually present a large volumetric change during the Martensitic (MA) transformation. This offers great opportunity for exploring new negative thermal expansion (NTE) materials if temperature interval of NTE can be extended. Here, we report colossal in fine-powdered Mn0.98CoGe prepared by repeated cycling (TC) through MA transition or ball milling. Both treatments expand transformation, and thus broaden window (ΔT). For powders that have gone TC ten...
The electronic entropy enhanced giant barocaloric effect along with high thermal conductivity in hexagonal Ni<sub>1−x</sub>Fe<sub>x</sub>S.
We report the structural, magnetic, electrical transport properties, and magnetocaloric effect (MCE) of antipervoskite compound AlCMn3. It exhibits a second-order ferromagnetic–paramagnetic phase transition around (TC) 287 K. The electronic resistivity (ρ) shows good metallic behavior except for slope change TC. At lower temperatures (below 130 K), ρ∝T2 indicates that electron-electron scatterings domain. evaluated (130–270 ρ is linear dependence on temperature, implying phonon boost up...
Scandium trifluoride (ScF3), adopting a cubic ReO3-type structure at ambient pressure, undergoes pronounced negative thermal expansion (NTE) over wide range of temperatures (10 K–1100 K). Here, we report the size effects on NTE properties ScF3. The magnitude is reduced with diminishing crystal size. As revealed by specific heat measurement, low-energy phonon vibrations which account for behavior are stiffened as decreases. With decreasing size, peaks in high-energy X-ray pair distribution...
The thermal expansion and magnetic properties of antiperovskite manganese nitrides Ag1-xNMn3+x were reported. substitution Mn for Ag effectively broadens the temperature range negative drives it to cryogenic temperatures. As x increases, paramagnetic (PM) antiferromagnetic (AFM) phase transition (TN) decreases. At x~0.2, PM-AFM overlaps with AFM glass-like state transition. Above x=0.2, two new distinct transitions observed: one occurs above room from PM ferromagnetic (FM), other evolves at...
Negative thermal expansion (NTE) was investigated for Ga1−xMnxN0.8Mn3 (0.1 ≤ x 0.3). As increases, the temperature range where lattice contracts upon heating becomes broad and shifts to lower temperatures. The coefficient of linear beyond −40 ppm/K with a interval ∼50 K obtained around room in = 0.2 0.25. Local distortion which thought be intimately related NTE is invisible X-ray pair distribution function 0.3. Furthermore, zero-field-cooling exchange bias observed as result competing...
Compositing negative-thermal-expansion materials with Al is an effective strategy for obtaining light zero-thermal-expansion (ZTE) materials. However, the dimensional stability of those composites not guaranteed due to residual stress generated during fabrication and microstructure instability matrix. Here, we studied effects heat treatments on ZTE Cu2P2O7/ZL101 composite (with 32 vol. % ZL101) prepared using pressure infiltration method. Compared as-cast case, after a certain treatment...
The effects of the Ga content and substitution Al for on temperature coefficient resistivity (TCR) antiperovskite GaCFe3 have been investigated systematically. Our results indicate value TCR its range can be tuned by altering chemical compositions. With decreasing in Ga1−xCFe3 or increasing dopant Ga1−yAlyCFe3, sign changes from positive to negative room-temperature zero material achieved. Typically, optimized values are about −5.72 ppm/K(265–315 K) −14.68 ppm/K(280–320 Ga0.95CFe3...
We present the magnetic/structural phase diagram of Sn1-xGaxCFe3 (0 ≤ x 1). With increasing x, Curie temperature (TC) and saturated magnetization increase while lattice constant decreases. The results indicate that GaCFe3 may be a promising high-temperature soft magnetic material. Around TC, chemical composition-dependent magnetocaloric effect is studied. relative cooling power increases with reaching maximum ∼3.22 J/cm3 (∼61% Gd) around 345 K. Considering their remarkable advantages, are...
We report the magnetic, electrical, and thermoelectric properties of SnCCo3, where good performance [figure merit ZT ∼ 0.035(2), 258 K] strong electron correlation (Kadowaki-Woods ratio RKW 4a0) are observed. The ACCo3 (A = Al, Ga, Ge) SnCM3 (M Mn, Fe) were also investigated for comparison. As a result, value SnCCo3 is largest among all those samples, which mainly attributed to large Seebeck coefficient caused by low carrier density. Moreover, can be effectively enhanced proper chemical...