APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Qihui Sun,Jinyao Li,Hongyan Zhang,Xiong He,Baoshan Wu,Junwei Wang,Nasir Mahmood,Xian Jian
Traditional single-component microwave absorbers face the difficulties including the narrow absorption bandwidth and low absorption strength. Herein, we develop a novel dual-magnetic composite decorating with covalent-organic framework (COF of 1,3,5-triformylphloroglucinol and p-phenylenediamine: TpPa) and carbon hybrid to enhance microwave absorption performance. Namely, a dual-magnetic FeSiAl@(CoFe 2 O 4 /C)@TpPa core–shell structure with rich interfacial polarizations was prepared by the three main steps: firstly, the plate-like FeSiAl was decorated with the MOFs of ZIF-67. And then it was converted to FeSiAl@(CoFe 2 O 4 /C) after an annealing process under Ar. Lastly, the in-situ growth of COF (TpPa) was designed for enhanced microwave penetration into the interior of absorbers. The as-design dual-magnetic FeSiAl/CoFe 2 O 4 effectively favors to magnetic domain resonance resulting in the dual-magnetic coupling effects. Meanwhile, the multi-level structure formed by ultra-fine carbon in FeSiAl@(CoFe 2 O 4 /C)@TpPa enables magnetic-dielectric synergies and enriches the attenuation path as well. Furthermore, the accumulation of transferred charge at multiple interfaces provides a stronger relaxation polarization loss. The above positive factors collectively promote the high-performance microwave absorption with the reflection loss (RL) value up to −51.3 dB and the effective absorption bandwidth (EAB) covers 3.2–17.7 GHz by adjusting the thickness of absorbers. Therefore, this dual-magnetic/dielectric coupling approach provides an innovative strategy for fabricating advanced microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 8
·6027-6037
·
IF 3.442
Yang Dexin,Yang Tao,Chen Yulong,Liang Yu,Liu Yan’gai
Double perovskite La 2 CoMnO 6 is an attractive spintronics with magnetoelectric, magnetodielectric, and magnetoresistive effects, which are related, at least in part, to combined structural and magnetic instabilities. To explore its magnetoelastic coupling behaviour, a conventional analysis of lattice parameter data in terms of spontaneous strain shows that the ferromagnetic ordering process is accompanied by significant volume ( e aM ) and shear ( e tM ) strains. The DC and AC magnetic data reveal the antisite defects with antiphase regions, and the ferromagnetic transition is at ~ 230 K with a small antiferromagnetic ordering at about 170 K. In addition, the Rietveld refinement of the in situ variation X-ray diffraction from 120 to 1400 K, scanning electron microscopy, and differential scanning calorimetry were used to confirm the crystal structure, microstructure, magnetic, and structural anomalies of the sample synthesised in pure oxygen atmosphere. This study, and in particular the strain analysis, of La 2 CoMnO 6 will facilitate its potential application in the field of spin electronics and thin-film engineering.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 135
·期 16
·
IF 2.7
Zhao Dongpeng,Li Jun,Bai Han,Wu Huantong,Chen Xiping,Sun Guangai,Zhou Zhongxiang
Consistent c -axis orientation characteristics toward the direction of applied pressure of Y -type BaSrCo 2 Fe 11 AlO 22 (BSCFAO- θ ) were successfully prepared by the strategy of hot pressing. The samples’ magnetoelectric coupling performance was greatly enhanced by the strategy of hot pressing than that of the traditional solid reaction method. The magnetoelectric current of BSCFAO- θ ( θ = 0°) (12.06 μ A/m 2 ) was nearly 5 times higher than BSCFAO- SS (2.24 μ A/m 2 ). The magnetoelectric polarization of BSCFAO- θ ( θ = 0°) (32.82 μ C/m 2 ) was nearly 4 times higher than that of BSCFAO- SS (8.31 μ C/m 2 ). The magnetoelectric coupling coefficients of BSCFAO- θ ( θ = 0°) (1880 ps/m) were nearly 4 times higher than those of BSCFAO- SS (404 ps/m). The enhancement of magnetoelectric polarization of BSCFAO- θ ( θ = 0°) can be attributed to the uniform c -axis orientation, which reinforced magnetoelectric polarization compared with none orientation that eliminated the magnetoelectric polarization on grain boundaries. The magnetoelectric coupling performance of BSCFAO- θ presented a gradually decreasing trend with the angle changing from 0° to 90° for the changing of orientation. Compared with traditional solid reaction methods, the strategy of hot pressing inhibits grain growth and increases grain boundaries, thus facilitating the enhancement of grain boundaries’ resistivity, and the electrical resistivity of BSCFAO- θ (3.08 × 10 10 Ω cm) was nearly 10 000 times higher than that of BSCFAO- SS (2.5 × 10 6 Ω cm), which also benefits the magnetoelectric polarization performance of BSCFAO- θ . Therefore, the hot-pressing strategy can contribute to the forming of oriented ceramics and enhance the grain boundaries’ resistivity to improve magnetoelectric coupling performance.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Jianguo Liu,Yigong Guo,Zhanyu Wang,Xiao Xing,Gan Cui
Superhydrophobic coatings are renowned for their self-cleaning and water-repellent properties, making them increasingly valuable in industrial and consumer applications. Despite their widespread adoption, further enhancement of superhydrophobic performance remains a significant challenge. In this study, we introduce a novel approach to enhance the superhydrophobic capabilities of a composite coating by electrodepositing a Ni-WS 2 -PTFE composite coating under an applied magnetic field, notably improving its hydrophobic properties. The coupling of magnetic and electric fields induces a reorganization of the crystalline phase of nanoparticles within the plating solution, directly influencing the hydrophobicity of the composite coating. The water contact angle of the obtained Ni-WS2-PTFE composite coating reached 154°, with a minimum sliding angle of 4°. The coating also demonstrated excellent hydrophobic performance in both acid-base and weight-loss tests. After four weeks of immersion in a 3.5 % NaCl solution, the composite coating retained a corrosion resistance efficiency of 95 %. Magnetic fields play a beneficial role in the preparation of superhydrophobic coatings. While coatings produced through electrodeposition alone are not inherently superhydrophobic, the introduction of magnetic fields during the process imparts these desirable properties.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yong Zhou,Jiamei Liu,Xudong Zhao,Bin Yang,Bing Li,Xiaoyang Liu
Because of their unique electrical and magnetic properties, the perovskite multiferroic materials exhibit significant potential in spintronic device applications. However, synthesizing room-temperature multiferroic materials with robust magneto-electric coupling effects remains a major challenge. In this work, Yb 3 + , with an ionic radius slightly smaller than Y 3+ , was selected for A -site doping in the h -YMnO 3 , which has a high ferroelectric transition temperature (T C ∼ 900 K) and a low antiferromagnetic transition temperature (T N ≤ 70 K). This similar ionic radius allows Yb to substitute the Y site effectively while introducing distinct electronic states, thereby optimizing the structure and multiferroic properties of h -YMnO 3 without significantly altering the crystal structure. A series of Yb-doped Y 1- x Yb x MnO 3 ( x = 0, 0.1, 0.2, 0.3, 0.4, 0.5 and 1) materials were synthesized via conventional solid-phase reaction. The effects of Yb doping on the structure, magnetism, and ferroelectricity of h -YMnO 3 were studied. X-ray diffraction (XRD) and corresponding XRD refining results show that as Y 3+ is replaced by Yb 3+ with smaller radii, the cell parameters and cell volume of Y 1- x Yb x MnO 3 decrease, the cell is compressed, and the lattice structure of Y 0.5 Yb 0.5 MnO 3 obtained under the condition of Yb semi-doping changes significantly. Subsequent magnetic and room-temperature ferroelectric test results show that the Y 1- x Yb x MnO 3 series samples have anti-ferromagnetic ground states. In particular, the proper inclination of Mn 3+ ions in the double perovskite structure of Y 0.5 Yb 0.5 MnO 3 generates strong Dzyaloshinskii-Moriya (DM) interactions, resulting in relatively strong antiferromagnetism. The antiferromagnetic Neel temperature (T N ) from 37 K to 41 K. Yb 3+ -induced inclined ferroelectricity enables Y 0.8 Yb 0.2 MnO 3 to achieve the highest ferroelectric polarization of 0.030 µC cm −2 , which is 180 % greater than that of h -YMnO 3 . The results demonstrate that Yb doping plays a crucial role in regulating the structure and multiferroic properties of h -YMnO 3 , offering a novel strategy for developing room-temperature multiferroic materials with robust magneto-electric coupling.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yu Sun,Juan Liu,Tulai Sun,Zilong Yu,Ziyang Zheng,Mengru Ge,Lihong Bai
In this study, multiple rare earth elements were introduced to modify the multiferroic properties of BiFeO 3 . The effects of co-substitution on the structural evolution and properties were thoroughly investigated. With increasing substitution content, the ceramics underwent a symmetry transition from R 3 c to Pna 2 1 and finally to Pbnm . Co-substitution significantly enhanced the ferroelectric properties, with the highest remanent polarization of 33.14 μC/cm² observed at x = 0.10. Due to the symmetry evolution, ferromagnetism was released from the cycloidal spin structure, and the hysteresis loop gradually saturated, with the highest remanent magnetization ( M r ) of 0.25 emu/g observed at x = 0.16. The concurrent improvement in ferroelectricity and ferromagnetism resulted in substantial magnetoelectric coupling performance, with α ME = 3.50 mV/(cm·Oe). Moreover, direct current poling significantly induced the reverse transition from R 3 c to Pna 2 1 , indicating the potential for electrically controlled magnetism. This study provides a new perspective for modifying the magnetoelectric properties of BiFeO 3 .
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
npj Quantum Materials
·
2020
·Vol. 5
·期 1
·1-9
·
IF 6.562
Han Yifeng,Wu Meixia,Gui Churen,Zhu Chuanhui,Sun Zhongxiong,Zhao Mei-Huan,Savina Aleksandra A.,Abakumov Artem M.,Wang Biao,Huang Feng,He LunHua,Chen Jie,Huang Qingzhen,Croft Mark,Ehrlich Steven,Khalid Syed,Deng Zheng,Jin Changqing,Grams Christoph P.,Hemberger Joachim,Wang Xueyun,Hong Jiawang,Adem Umut,Ye Meng,Dong Shuai,Li Man-Rong
Rational design of technologically important exotic perovskites is hampered by the insufficient geometrical descriptors and costly and extremely high-pressure synthesis, while the big-data driven compositional identification and precise prediction entangles full understanding of the possible polymorphs and complicated multidimensional calculations of the chemical and thermodynamic parameter space. Here we present a rapid systematic data-mining-driven approach to design exotic perovskites in a high-throughput and discovery speed of the A 2 BB ’O 6 family as exemplified in A 3 TeO 6 . The magnetoelectric polar magnet Co 3 TeO 6 , which is theoretically recognized and experimentally realized at 5 GPa from the six possible polymorphs, undergoes two magnetic transitions at 24 and 58 K and exhibits helical spin structure accompanied by magnetoelastic and magnetoelectric coupling. We expect the applied approach will accelerate the systematic and rapid discovery of new exotic perovskites in a high-throughput manner and can be extended to arbitrary applications in other families.
研究领域:
材料科学
·
计算化学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Lei Meng,Chen He,Fei Yen
Most ferroelectric crystals have their own set of unique characteristics, and ammonium sulfate (NH4)2SO4 is no exception. We report on two previously unidentified features in ammonium sulfate: (1) that there are at least two successive transitions instead of one occurring at the Curie temperature TC = 223 K according to dielectric constant measurements, and (2) pronounced step-like anomalies are found in the magnetic susceptibility χ(T) exactly at TC. To explain these results, we take into account that there exists a previously unidentified linear coupling between the magnetic and electric dipole moments of the NH4+ tetrahedra due to their rapid reorientations and distorted geometry, respectively. The magnetic moments are small, 0.0016 μB for every C3 reorientation, which involves three protons (H+) undergoing orbital motion. Nevertheless, short-range correlations exist in the paraelectric phase because the magnetic moments are restricted to only point along 14 possible orientations due to the symmetry and periodic nature of the potential wells. At TC, C2 reorientations (involving four protons) are no longer energetically feasible, so the reduction in the degrees of freedom to 8 further enhances the effect of the magnetic interactions. This triggers long-range ordering of the orbital moments in an antiferromagnetic configuration along the ab-plane, which via Dzyaloshinskii–Moriya interactions ends up canting slightly toward the c-axis direction. Since there exist two types of inequivalent NH4+ groups that reorient at different frequencies with temperature and do not have the same degree of distortion, the emerging polar phase is ferrielectric. This previously unidentified “magneto-protonic” effect can be further extended toward understanding the fundamental causes of the spontaneous polarization in many other ferroelectric crystals as well as provide the missing link toward understanding the enhanced functionalities of many hydrogen-based compounds and organic–inorganic hybrid materials.
研究领域:
物理学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 21
·5239
·
IF 3.1
He Han,Hui Chen,Rui Wang,Zhichao Lou
With the popularization of wireless communication, radar, and electronic devices, the hidden harm of electromagnetic radiation is becoming increasingly serious. The design of green biomass carbon-based interface heterojunctions based on lightweight porous materials can effectively protect against electromagnetic radiation hazards. In this work, we constructed an anisotropic heterojunction interface with magnetic and dielectric coupling based on a honeycomb-like periodic matrix multi-layer array repeating unit. The removal of lignin components from bamboo through oxidation enriches the impregnation pores and uniform adsorption sites of the magnetic medium. Further, in situ pyrolysis promotes the formation of a large number of electric dipoles at the interface between the magnetic medium and dielectric coupling inside the periodic cell carbon skeleton, enhancing interface polarization and relaxation. Local carrier traps and uneven electromagnetic density enhance dielectric and hysteresis losses, resulting in excellent impedance matching. Therefore, the obtained bamboo-based carbon multiphase composite absorbent has satisfactory electromagnetic loss characteristics. At a thickness of 1.55 mm, the effective absorption bandwidth reaches 5.1 GHz, and the minimum reflection loss (RL) value reaches −54.7 dB. In addition, the far-field radar simulation results show that the sample has an excellent RCS (radar cross-section) reduction of 33.3 dB·m2. This work provides new directions for the diversified development of green biomass and the optimization of the design of magnetic and dielectric coupling in periodic array structures.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS-CONDENSED MATTER
·
2021
·Vol. 34
·期 10
·105803
·
IF 2.333
Jun Li,Dongpeng Zhao,Han Bai,Zhi Yuan,Zhongxiang Zhou
Magnetic-field induced dynamic magnetoelectric coupling effects and polarization performance of Z-type Sr3Co2Fe24O41 (SCFO) ceramic has been investigated. Results found that SCFO's transverse tapered magnetic structure can induce electric polarization, and its electric polarization direction will not change under external magnetic effects. First-order dynamic magnetoelectric coupling coefficient (α) and second-order dynamic magnetoelectric coupling coefficient (β) of SCFO exhibited strong response main in magnetic structural phase transition region. The magnetoelectric structural phase transition position appeared in low magnetic field, and the magnetic moment vector and its corresponding electric polarization vector of SCFO exhibited the most unstable state near its equilibrium position, which is beneficial for inducing strong dynamic magnetoelectric coupling response. When the applied magnetic fields to SCFO increased, the magnetic moment stability near the equilibrium position increased, and the dynamic magnetoelectric coupling response decreased. Results showed that the dynamic magnetoelectric coupling response of SCFO can bear T1 = 370 K high temperature. The dynamic magnetoelectric coupling response induced by low magnetic fields in SCFO contributes to its actual application in next generation magnetoelectric information storage devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 12
·1-13
·
IF 2.584
Li Wenchuan,Wu Heng,Ao Hong,Zeng Zhixin,Gao Rongli,Cai Wei,Fu Chunlin,Deng Xiaoling,Chen Gang,Wang Zhenhua,Lei Xiang
Multiferroic composite ceramics x Ni 0.15 Cu 0.25 Zn 0.6 Fe 2 O 4 -(1- x ) Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 ( x = 0, 0.2, 0.3, 0.4, 0.5, 0.6, 0.9 and 1) were prepared by combining chemical co-precipitation method with sol–gel method; the microstructure, dielectric, ferroelectric, magnetic and multiferroic properties were comparatively investigated. XRD results show that all the specimens have obvious bi-phases structure. The grains with larger size are magnetic phase Ni 0.15 Cu 0.25 Zn 0.6 Fe 2 O 4 (NCZF), while that of smaller size can be attributed to ferroelectric phase Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 (BCZT). The dielectric constant of the sample with x = 0.6 is the largest at low frequency but the specimen x = 0.2 has the highest value of dielectric constant in high-frequency region. When x = 0.9, the ceramic has the largest loss, while it presents the lowest loss value when x = 0.3. The height of the peak decreases with increase in the frequency, and the position of the peak moves to higher temperature range with the decrease in x . The dielectric loss increases sharply with temperature, especially when x = 0.9, when the temperature is higher than 300 °C, the dielectric loss reaches hundreds of times under low frequency. Al samples present apparent ferroelectric hysteresis loops, but further characterization shows that the hysteresis may be attributed to leakage current. The remnant polarization( P r ) and coercive field( E c ) do not monotonically change with x , P r is 0.1576 μC/cm 2 at 2 kHz when x = 0.6. The magnetization monotonically changes with the x , indicating that there is a strong interfacial interaction between the two phases. Under the action of an external magnetic field of 1 mT, the magnetoelectric (ME) coupling is the strongest (relative polarization change 37%) when x = 0.2.
研究领域:
材料科学
·
物理学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·
IF 3.9
Lu Liu,Xiao Li Zhu,Xiang Ming Chen
In the present work, the strategy of multielements co-substitution for BiFeO 3 ceramics was adopted to enhance the ferroelectricity and magnetoelectric coupling effect where the effective radius of rare-earth ions was equivalent to that of Sm 3+ . Differing from the case of Sm-substituted BiFeO 3 ceramics, the symmetry of the present ceramics changed from R3c to Pbnm directly without the formation of Pna 2 1 with increasing RE-substitution content. The ferroelectricity was significantly improved, and the saturated polarization−electric field ( P - E ) hysteresis loop with P r = 37.63 μC/cm 2 was obtained in Bi 0.95 (La 0.20 Nd 0.20 Sm 0.20 Gd 0.20 Lu 0.20 ) 0.05 FeO 3 ceramics. The leakage current was reduced by almost six orders of magnitude in multielements co-substituted BiFeO 3 ceramics, which was much lower than that of BiFeO 3 end-member. Moreover, the magnetoelectric coupling coefficient α ME of 0.96 mV/cm Oe was achieved in Bi 0.86 (La 0.20 Nd 0.20 Sm 0.20 Gd 0.20 Lu 0.20 ) 0.14 FeO 3 ceramics, which was larger than that of Sm-substituted BiFeO 3 ceramics. The strategy of multielements co-substitution might provide a new approach to improving ferroelectricity and magnetoelectric coupling effect in BiFeO 3 ceramics, which could be physically interpreted as the results of the reduced leakage current and increased local polarization configuration caused by the multiple elements substitution.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）