Advanced Electronic Materials
·
2026
·
IF 5.9
Qing Tian Li,Xiao Li Zhu,Xiao Qiang Liu,Xiang Ming Chen
Rare earth (RE) substitution is the primary way to realize the electric field-controlled magnetism in BiFeO 3 multiferroic ceramics by breaking the cycloidal spin structure to release the intrinsic weak ferromagnetism, where the electric field-induced phase transition of Pna 2 1 /R 3 c plays the key role. In the present work, the remarkable electric field-controlled magnetism has been achieved in La/Sm co-substituted BiFeO 3 multiferroic ceramics. The structure evolution in Bi 1- x (La 0.37 Sm 0.63 ) x FeO 3 ceramics is modulated from R 3 c to Pna 2 1 and finally Pbnm with increasing x . The weak ferromagnetism is released as the symmetry is tuned from R 3 c to Pna 2 1 and the cycloidal spin structure is broken. Furthermore, La/Sm co-substitution significantly suppresses the leakage current to a level far below that of other RE-substituted BiFeO 3 ceramics, thereby facilitating the enhanced dielectric strength, which significantly promotes the electric field-induced phase transition of Pna 2 1 /R 3 c , and subsequently, the remarkable electric field-controlled magnetism (a change of M r up to 62.7%) is achieved in the present ceramics. Moreover, the significant improvement in ferroelectricity is also achieved after the electric field-induced phase transition of Pna 2 1 /R 3 c .
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·Vol. 61
·期 9
·5804-5816
·
IF 3.9
Cheng Li-Qian,Wang Pengcheng,Li Qingna,Wang Zhiping,Jiang Yuqi,Zhu Dongze
The electrocaloric effect (ECE) has attracted considerable attention for its promising application in next-generation solid-state cooling systems due to its high efficiency, environmental friendliness, and potential for device miniaturization. In this study, rare-earth element Sm was introduced to dope in the relaxor ferroelectric ceramics based on 0.7 Pb(Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 (PMN–30PT) to enhance the ECE response and broaden the working temperature range. The Sm doping effectively enhanced the breakdown strength, reduced leakage current, and refined grain morphology was also observed, contributing to improved electrical reliability. The Sm-doped sample achieved an adiabatic temperature change of 1.38 K under an electric field of 40 kV cm −1 . Moreover, an inferred broad effective temperature span ( T span ) of 62 °C was obtained, indicating excellent wide temperature reliability. These results demonstrate that appropriate Sm doping not only enhances the EC response but also broadens its operational temperature window, offering valuable insights for the design of high-performance electrocaloric ceramics for energy-efficient and environmentally friendly solid-state cooling applications.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Q.B. Chen,B. Meng,M.Y. Zhao,H. Xie,L.F. Bian,X. Yang
In order to investigate the grain size effect on the electrical conductivity of the submicron samarium-heavily-doped ceria , the Ce 0.8 Sm 0.2 O 1.9 (SDC20) ceramics with grain sizes from 128 nm to 533 nm were prepared by sintering at 1000–1300 °C in the air atmosphere. The crystalline structure, micro-morphology, density and electrical conductivity of the SDC20 ceramics were measured and characterized by XRD , SEM, TEM, Archimedes method and electrochemical impedance spectrum, respectively. All the sintered samples show the single SDC phase, low porosity and clean grain boundary without any impurities. The grain sizes of SDC ceramics grow continuously with the rising sintering temperature , and the relative densities increase as the sintering temperature rises from 1000 °C to 1200 °C and then decrease with the temperature from 1200 °C to 1300 °C. The specific grain boundary conductivity of SDC keeps decreasing while the grain and apparent grain boundary conductivities increase during the whole grain size range of 128–533 nm.
研究领域:
材料科学
·
电化学
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INORGANICA CHIMICA ACTA
·
2021
·
IF 2.545
Yan-Lan Sun,Fen-Mei Zhou,Zhen-Jing Chi,Yu-Lei Zhang,Rui-Rui Zhang
This article has been retracted: please see Elsevier Policy on Article Withdrawal ( https://www.elsevier.com/locate/withdrawalpolicy ). This article has been retracted at the request of the editors. In investigating concerns brought up regarding the authenticity of the article, the editors reached out to the corresponding author for an explanation. Despite several attempts in requesting clarification on the concerns, the authors have not replied to the editors’ requests. The editors therefore feel that the findings of the manuscript cannot be relied upon and that the article needs to be retracted.
研究领域:
医学
·
药理学
·
生物化学
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Jing Gao,Baoguo Zhang,Fu-an Guo,Yubao Liu,Jianying Zhao,Zhongning Shi,Xiangfa Liu
Developing efficient, green, and cost-effective methods for extracting rare earth (RE) metals is essential to accelerate breakthroughs in critical technologies in the field of RE-based functional materials. In this study, a low-cost aprotic polar molecular liquid, N,N-Dimethylformamide (DMF), was used for electrowinning metallic Sm with upstream SmCl 3 as the raw material, inspired by previous applications of diverse specialised ionic liquids for the electrochemical recovery of RE metals. Cyclic voltammetry and electrodeposition experiments demonstrated that metallic Sm cannot be obtained from the binary DMF-SmCl 3 system, but can be electrodeposited with LiNO 3 . Therefore, the mechanism underlying the observed electrochemical behaviour is elucidated and discussed in detail. Sm and Sm–Co metallic elements were successfully electrodeposited on an Al substrate at a relatively high current density, characterised, and evaluated using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Moreover, a unique two-step method involving electrodeposition and direct smelting is prospectively described for the continuous preparation of bulk RE-containing alloys to stabilise highly active RE elements. Therefore, this study provides valuable insights into practical solvometallurgical processes for RE metal extraction, refinement, and recycling.
研究领域:
冶金学
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材料科学
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环境科学
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123544
·
IF 7.5
Zihao Wei,Yulin Qin,Mengbo Zou,Lin Jia,Haorun Li,Yuekun Zhang,Jinyu Wang,Zeyu Guo,Hao Wu,Zeyu Zhang,Shanghong Zeng
The rational surface regulation of Cu electrocatalysts through doping foreign components has emerged as a feasible pathway in electrochemical CO 2 reduction reaction. Herein, the catalysts comprising the Cu 0 -Sm 3+ -Cu + sites are reported to explore the doping-driven the alteration of surface structure and properties. The incorporation of Sm with oxygen affinity in Cu 2 O/Cu decreases the crystallite sizes and evokes lattice expansion of Cu 2 O and Cu to generate surface defects. The interaction of Cu 0 , Sm 3+ and Cu + promotes dual-carbon production by stabilizing Cu + and enhancing *CO coverage and water dissociation. Our findings therefore reveal the role of Sm in promoting beneficial changes of Cu-based electrocatalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Dongya Liu,Yue Dong,Jinyue Wang,Xiuping Chen
Surface Lewis acid sites are crucial for targeted substrate adsorption and activation. Engineering these sites thus accelerates the cyclohexanol oxidation reaction (CHAOR). Here, we incorporate Sm into LaCoO 3 perovskites to create a high density of surface Lewis's acid centers. Operando spectroscopy and theoretical calculations demonstrate that these Sm sites function as molecular anchors, enhancing CHA adsorption affinity while protecting active Co centers from oxidative degradation. This modification strengthens Co–O covalency and lowers the energy barrier for the rate-determining dehydrogenation step. Consequently, the optimized 3%Sm-LCO catalyst exhibits exceptional conversion and selectivity. When integrated into a practical membrane electrode assembly, the hybrid system requires a low cell voltage of 1.559 V to reach an industrial current density of 100 mA cm −2 . The system maintains stable co-production of sustainable adipic acid and green hydrogen for over 300 h, establishing Lewis's acid site engineering as a powerful strategy for advanced electrocatalyst design.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Siyuan Wang,Wei Cai,Dongsheng Shi,Jingwu Zheng,Liang Qiao,Haibo Chen,Naoki Wakiya,Naonori Sakamoto,Takahiko Kawaguchi,Shenglei Che
High-performance SrFe 12 O 19 meets the current demands for lightweight and high-efficiency devices. In this study, Sm‒(Co/Zn/Ca) co-doped spherical SrFe 12 O 19 powders were synthesized via ultrasonic spray pyrolysis. This approach overcomes the limitation of single Sm doping in M-type strontium ferrite, which enhances coercivity but decreases saturation magnetization. The effects of co-doping on the structural and magnetic properties of the material were systematically investigated using X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, Brunauer–Emmett–Teller, Mössbauer spectroscopy, and both room-temperature and low-temperature vibrating sample magnetometry (VSM). Among all the synthesized samples, SrSm 0.20 Zn 0.05 Fe 11.75 O 19 exhibited the highest saturation magnetization ( M s = 78.983 emu/g) while maintaining a coercivity of 7.097 kOe. Compared to SrSm 0.20 Fe 11.80 O 19 , Sm‒Zn co-doping resulted in a 20.12% increase in M s with only a 0.42% reduction in H cj . The results indicate that Zn 2+ preferentially substitutes Fe 3+ at the 4f 2 spin-down sites, reducing the contribution of reverse magnetic moments and thereby enhancing M s . Additionally, as a non-magnetic ion, Zn 2+ does not disrupt Fe‒O‒Fe super-exchange interactions, leading to a minimal reduction in H cj . In contrast, Ca 2+ tends to occupy the 12k and 2a spin-up sites, which reduces spin-up magnetic moments, negatively affecting M s enhancement. Moreover, Co 2+ , being a magnetic ion, disturbs Fe‒O‒Fe super-exchange interactions when incorporated into the SrFe 12 O 19 lattice, leading to a more significant decrease in coercivity. The magneton number ( n B ) calculated from low-temperature VSM confirmed the magnetic moment enhancement effect in the co-doped system, while Mössbauer spectroscopy provided further insights into the hyperfine interactions. This study demonstrates that the Sm‒(Co/Zn/Ca) co-doping strategy effectively balances M s and H cj , significantly improving the magnetic performance of SrFe 12 O 19 . Furthermore, ultrasonic spray pyrolysis proves to be a scalable and cost-effective synthesis method, showing great potential for the large-scale production of high-performance ferrite powders. These findings provide a theoretical foundation for optimizing SrFe 12 O 19 magnetic properties and offer new perspectives for its application in permanent magnet technology.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 8
·e71137
·
IF 4.2
Bi Fu,Minghan Yang,Junfu Cheng,Zhanxu Chen,Yunbao Zheng,Yifang Li,Guangqi Hu,Yingji He,Chengzhi Hu,Yaping Wang
Single-phase multiferroic BiFeO 3 exhibits antiferromagnetism and weak magnetoelectric (ME) coupling due to its cycloidal spin structure (period ≈ 62 nm), which fundamentally limits its ME–piezo–photocatalytic activity. Herein, we demonstrate that Sm doping in (Bi 1−x Sm x )FeO 3 ( x = 0–0.2) induces lattice‒distortion coupling that disrupts the spin cycloid and releases latent magnetization, leading to Sm-doping-dependent modulation of multiferroicity, ME coupling, and optical properties, with optimal piezo–photocatalysis ( x = 0.15). This lattice‒distortion coupling is further nanoconfined within the one-dimensional boundaries of the nanoporous hollow (Bi 0.85 Sm 0.15 )FeO 3 ceramic nanofibers (NFs) fabricated by sol‒gel‒electrospinning. The resulting fibers provide abundant catalytic sites, enhanced ferro/piezoelectricity, and a narrowed band gap (2.02 eV), achieving an ME–piezo–photocatalytic rate constant of 2.7 × 10 −2 min −1 . Cyclic tests yield rate constants of 1.77 ± 0.17, 0.84 ± 0.48, and 2.97 ± 0.59 × 10 −2 min −1 , after excluding the outlier, the mean value is 2.50 × 10 −2 min −1 (RSD = 24.8%). Combined with the morphological and microstructural observations, these results confirm the good stability and reusability. The synergistic enhancement originates from ferroelectric and ME vibration-induced built-in electric fields that effectively suppress photogenerated electron–hole recombination. This study demonstrates that lattice‒distortion coupling in rare-earth-doped BiFeO 3 NFs provides a promising strategy for enhancing ME–piezo–phototronics in environmental remediation.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yanli Zhang,Changsheng Huang,Dianhui Wang,Fengxin Ye,Fengfei Lu,Chaohao Hu,Lichun Cheng
Brownmillerite-type Sm x Ca 2- x Fe 2 O 5 ( x = 0, 0.1, 0.2, 0.3, 0.4) was synthesized by sol-gel method. The results indicate that Sm doping effectively tailors the microstructure of the material and enhances both defect polarization and interface polarization, leading to improved dielectric properties. The pristine Ca 2 Fe 2 O 5 exhibited a maximum reflection loss (RL) of only −17.24 dB and an effective absorption bandwidth (EAB) of 2 GHz. In contrast, the doped Sm 0.2 Ca 1.8 Fe 2 O 5 exhibited the optimal EMW absorption performance: achieving an RL of −53.7 dB at a thickness of 1.8 mm, and an EAB of 5.04 GHz at 2.0 mm thickness, nearly covering the entire Ku band (12–18 GHz). This work provides valuable insights for the design and application of brownmillerite oxides in 5G shielding or radar stealth materials.
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MATERIALS RESEARCH BULLETIN
·
2013
·
IF 1.913
Weimin Du,Zhaoqiang Zhu,Xiaofen Zhang,Dacheng Wang,Donghe Liu,Xuefeng Qian,Jimin Du
Zirconia modified by Samarium/Europium, RE/ZrO 2 (RE = Sm , Eu ), composite oxide nano-materials have been successfully synthesized by improved sol–gel method. Characterization results show that X-ray diffraction (XRD) peaks of products gradually shift to the lower angle with the increase of rare earth which implies that the lattice distances of RE/ZrO 2 nano-materials are gradually enlarged. Moreover, the molar ratios between zirconium and rare earth are consistent with the chemical formula and both of them are uniformly distributed in samples. Optical properties indicate that defect structures and electron configurations of RE/ZrO 2 (RE = Sm , Eu ) with single phase determine their absorption properties on visible light. Photocatalytic experiments indicate Zr 0.8 Sm 0.2 O 2− δ nano-crystals have excellent visible-light-responsive photocatalytic activities on Methylene blue and Rhodamine B which results from the special defect structure, suitable electronic configuration, and larger specific surface area. It follows that Zr 0.8 Sm 0.2 O 2− δ nano-crystals are new visible-light-responsive photocatalysts which can be applied in dye wastewater treatment and environmental protection in the future.
研究领域:
材料科学
·
环境科学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Hong Zhang,Qian Du,Xin Du,Zhanglian Xu,Shaoqiang Guo,Wentao Zhou
The electrorefining of spent nuclear fuels in a molten LiCl-KCl salt electrolyte recovers the valuable actinides but also releases radioactive fission products in the salt. To minimize the nuclear waste volume, dissolved fission products such as rare earths (REs) must be removed from the electrorefining salt and immobilized into proper wasteforms. Here we propose a two-step approach for treating the electrorefining waste salt by (i) the electrolytic recovery of REs from the salt using a liquid metal cathode; and subsequent (ii) oxidative extraction of REs from the liquid metal into durable wasteforms. Experimental demonstration using rare earth element samarium (Sm) and liquid metal (Bi) was successful. The Sm ions dissolved in the salt can be selectively recovered as dendrite Sm-Bi intermetallic products on the top of liquid bismuth cathode through electrolysis at appropriate applied currents or potentials. Then the Sm in the Sm-Bi alloy was efficiently extracted into both zinc-in-titania (ZIT) glass ceramic and lanthanide aluminoborosilicate (LABS) glass wasteforms through selective oxidation at Sm 2 O 3 loadings of 18–25 wt% and 50 wt%, respectively. Recycling of the electrorefining salt with minimum nuclear waste generation is foreseeable with the use of this simple, efficient, and highly compatible process.
研究领域:
核化学与技术
·
材料科学
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危险品化学品经营许可证（带存储）