JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Zhan-Ping Qiao,Meng-Yao Su,Yuan-Lin Dang,Qi-Chao Yang
The phase diagrams of the Mg(NO 3 ) 2 –Ln(NO 3 ) 3 (Ln = Nd, Sm, Eu, Tb)–HNO 3 –H 2 O systems in the (∼20%) HNO 3 regions at T = 298.15 K were determined by using an isothermal solution saturation method. The Schreinemaker’s wet residues method was used to determine the compositions of solid-phases. Both Mg(NO 3 ) 2 –Nd(NO 3 ) 3 –HNO 3 –H 2 O and Mg(NO 3 ) 2 –Sm(NO 3 ) 3 –HNO 3 –H 2 O systems are complicated with three equilibrium solid phases Mg(NO 3 ) 2 ·6H 2 O, Mg 3 Ln 2 (NO 3 ) 12 ·24H 2 O and Ln(NO 3 ) 3 ·6H 2 O (Ln = Nd, Sm). But the systems Mg(NO 3 ) 2 –Eu(NO 3 ) 3 –HNO 3 –H 2 O and Mg(NO 3 ) 2 –Tb(NO 3 ) 3 Tb–HNO 3 –H 2 O are simple eutonic type. The two new solid-phase compounds Mg 3 Nd 2 (NO 3 ) 12 ·24H 2 O and Mg 3 Sm 2 (NO 3 ) 12 ·24H 2 O are congruently soluble in an average medium of ∼20 mass % HNO 3 , and they were identified and characterized by the methods of powder X-ray diffraction, X–ray diffraction single crystal structure analysis, and thermogravimetric/differential thermogravimetric. The XRD diffraction patterns for the two new solid-phase compounds are identical due to their isomorphic structure. They belong to hexagonal systems, with space group R 3 . For Mg 3 Nd 2 (NO 3 ) 12 ·24H 2 O, a = b = (1.0993 ± 0.0005) nm, c = (1.7211 ± 0.0007) nm, V = (1.8012 ± 0.0013) nm 3 , D c = (4.2532 ± 0.0024) g·cm −3 , Z = 3; for Mg 3 Sm 2 (NO 3 ) 12 ·24H 2 O, ( a = b = 1.1198 ± 0.0004) nm, c = (1.7257 ± 0.0006) nm, V = (1.8742 ± 0.0011) nm 3 , D c = (4.1201 ± 0.0012) g cm −3 , Z = 3. The standard molar enthalpies of solution of the compounds Mg 3 Nd 2 (NO 3 ) 12 ·24H 2 O and Mg 3 Sm 2 (NO 3 ) 12 ·24H 2 O in water (aq) were measured to be (101.26 ± 0.77) kJ mol −1 and (80.27 ± 0.81) kJ mol −1 , and their standard molar enthalpies of formation were calculated to be – (12214.13 ± 2.5) kJ mol −1 and – (12183.6 ± 2.5) kJ mol −1 , respectively.
研究领域:
化学
·
物理化学
·
材料科学
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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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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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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.
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RSC Advances
·
2020
·Vol. 10
·期 14
·8540-8547
·
IF 3.119
Guohai Yang,Daqing Zhang,Gen Zhu,Tingrong Zhou,Manting Song,Lulu Qu,Kecai Xiong,Haitao Li
The instability of graphene oxide (GO) membranes in aqueous solutions restricts their application in wastewater treatment through the membrane separation technology. In this work, a nanocomposite membrane (Sm-MOF/GO) composed of samarium metal–organic frameworks (Sm-MOFs) and GO nanosheets was successfully fabricated via the filtration of the corresponding Sm-MOF/GO dispersions. The in situ growth of Sm-MOF with aqueous stability on the GO sheets prevented the adjacent GO layers from expanding in aqueous solutions, thus endowing the prepared Sm-MOF/GO membrane with a stable membrane skeleton structure. Besides, the successful loading of Sm-MOF enlarged the layer space of the composite membrane, which was beneficial for higher permeance. The optimization of the Sm-MOF loading contents was also investigated to prepare M-X (where X represents the mass ratio of the MOF raw material to the total mass of the reactants). Subsequently, the fabricated M-0.31 possessed a high permeance of 26 L m−2 h−1 bar−1, which was 3 times higher than that of a pure GO membrane; moreover, high rejections (>91%) to rhodamine B and methylene blue were obtained. After continuous 5.5 h filtration, the excellent rejection was still maintained as expected, indicating the long-term stability of M-0.31.
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PubMed
高影响因子
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.
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CHEMOSPHERE
·
2023
·
IF 8.8
Chaoyang Zhang,Conghao Gao,Shumin Yang,Xin He,Yue Chen,Xiao Qin,Yulin Tang
Chloramphenicol (CAP) is used extensively in industry and daily life, but its abuse has seriously affected the environment and public health. In this paper, a new composite PbO 2 electrode was obtained through the modification Sm and polyethylene glycol (PEG), and an electrocatalytic oxidation technology of CAP degradation was investigated. The results showed that the catalytic degradation ability and industrial service life of the PEG-Sm-PbO 2 composite electrode were significantly enhanced. Co-doping inhibited the growth of grains, resulting in the formation of refined pyramidal grains on the surface of the electrode, which increased the number of active spots. The industrial service life of the modified electrode was improved by 87.0%. In addition, the degradation effect under different conditions and mechanism of CAP were also explored. The optimal conditions for CAP degradation were explored, at which time the CAP degradation rate reached 99.1%. The degradation process was in accordance with the primary reaction kinetics, and the apparent rate constant of CAP at the PEG-Sm-PbO 2 electrode was raised by 57.1% in comparison with the unmodified electrode, indicating that the modification facilitated the degradation of CAP in the electrode. Finally, two possible CAP degradation pathways were deduced. The results will provide technical support and a theoretical basis for the degradation of persistent organic pollutants.
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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.
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Yuanlang Wan,Xuefang Xie,Shuang Zhou,Weihang Li,Jingkang Ma,Yaqin Zhou,Yijian Song,Ji Zhou,Anqiang Pan
Li3VO4 (LVO) presents significant advantages in cost and capacity, making it a promising candidate for next-generation lithium-ion battery (LIB) anodes. However, its low electronic conductivity hampers practical applications. Herein, we report a Sm-modified Li3VO4/C composite (LSVO/C) designed for high-performance LIBs. Sm doping introduces additional defects and optimizes the electronic structure of Li3VO4, resulting in a significantly enhanced electronic conductivity (2.94 × 10–3 S cm–1) of the composites. Furthermore, the carbon-fiber-based framework effectively maintains structural stability during cycling, facilitating superior ion transport kinetics. Benefiting from these enhancements, the LSVO/C composite achieves remarkable discharge capacities of 379.5 mAh g–1 at 0.25 C and 260.1 mAh g–1 at 12.5 C. Additionally, an LSVO/C||NCM111 full cell, using LiNi1/3Co1/3Mn1/3O2 (NCM111) as the cathode, retains a discharge capacity of 50.5 mAh g–1 after 1000 cycles at 3.0 C, highlighting the potential of LSVO/C for practical applications. This unique method in preparing anode material will open new gates for highly efficient LIBs.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jian Zhang,Zihan Zhao,Ke Wang,Yingying Li,Yuxuan Tao,Chunlei Zhao,Xiulai Chen
One‑carbon (C1) compounds are important carbon feedstocks for achieving a sustainable bio-economy. However, it remains challenging to tap the full potential of C1 compounds utilization, due to the inefficiency of co-utilization of different C1 compounds. Here, a new-to-nature C1-fixing pathway, the serine aldolase/malic enzyme (SM) cycle, was developed to convert C1 compounds to acetyl-CoA by programming CO 2 -fixing carboxylation reaction, formaldehyde-assimilating aldolization reaction and acetyl-CoA-producing cleavage reaction. The SM cycle was drafted by metabolic retrosynthesis, constructed with enzymes originating from six different organisms, and optimized by engineering key enzymes and adjusting reaction system, and thus its C1 utilization rate was up to 30.2 nmol min −1 mg −1 cycle proteins. Sequentially, the SM cycle was programmed in a plug-and-play fashion by installing carbon chain extension modules for converting C1 compounds to various organic molecules such as C 2 -compounds ( e.g. , acetaldehyde and acetyl-CoA), C 3 -compounds ( e.g. , pyruvate, 3-hydroxypropionate and propionyl-CoA), C 4 -compounds ( e.g. , succinate, fumarate and succinyl-CoA). Finally, the applicability of the SM cycle was ascertained in a 5 L fermenter for the production of diverse chemicals, such as pyruvate and succinate, with C1 utilization rate up to 34.5 and 35.8 mg/gDCW/h, respectively, surpassing that of microalgae and cyanobacteria. This study presented here provides a carbon-negative flexible platform for widening the versatility of C1 utilization and may boost C1-based biomanufacturing in a sustainable future.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 9
·9870-9876
·
IF 1.798
Liu Changbai,Wang Xuesong,Xie Feng,Liu Li,Ruan Shengping
Pure and Sm-doped In 2 O 3 porous nanotubes have been successfully fabricated by the single-capillary electrospinning method followed by calcination. The as-synthesized porous nanotubes were investigated by X-ray powder diffraction (XRD), energy-dispersive X-ray (EDX), scanning electron microscope (SEM), Raman spectra and X-ray photoelectron spectroscopy (XPS). It can be seen in SEM images that the surface of nanotubes is distributed with numerous pores. Gas sensing investigation reveals that Sm-doped In 2 O 3 porous nanotubes possess high-performance formaldehyde sensing properties. The response of gas sensors based on Sm-doped In 2 O 3 porous nanotubes was 54.37 towards 100 ppm formaldehyde at 240 °C, which was 5 times larger than that of pure In 2 O 3 porous nanotubes (10.87). The response and recovery times to 100 ppm formaldehyde were 9 and 40 s, respectively. Moreover, even at low concentration of 100 ppb formaldehyde, a detectable response of 2.1 can be observed. Furthermore, Sm-doped In 2 O 3 porous nanotube gas sensors have excellent selectivity to formaldehyde.
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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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