RARE METALS
·
2024
·
IF 9.6
Zeng Jin-Quan,Qi Jun-Lei,Yang Yue-Yang,Zhang Min-Hao,Lin Yuan-Hua
The practical application of CaSmAlO 4 microwave dielectric ceramics is limited by its low quality factor ( Q × f ) value and non-zero temperature coefficient resonant frequency ( τ f ) value. In this study, we introduced Mg 2+ –Ti 4+ ionic pairs into CaSmAlO 4 , along with an excess of 9% Sm 2 O 3 . The Mg 2+ –Ti 4+ ionic pairs substituted Al 3+ , and two phases simultaneously coexisted in the ceramics: CaSmAlO 4 and Sm 2 O 3 . As the doping concentration of Mg 2+ –Ti 4+ ionic pairs increased, the relative permittivity exhibited an upward trend, while the quality factor and resonant frequency temperature coefficient first rose and then descended. Remarkably, 0.09Sm 2 O 3 –0.91CaSmAl 0.7 Mg 0.15 –Ti 0.15 O 4 sintered at 1450 °C yielded excellent dielectric properties: ε r = 19.72, Q × f = 72,936 GHz, and τ f = –0.044 ppm·°C − 1 . The factors influencing the microwave dielectric properties of 0.09Sm 2 O 3 –0.91CaSmAlO 4 ceramics were further examined by considering the crystal structure, grain size, Lichtenecker logarithmic rule, tolerance factor and packing fraction. Graphic abstract
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Journal of Analytical Methods in Chemistry
·
2020
·
IF 1.878
Li Jiang,Yun Wu,Yan Wang,Qin Zhou,Yuguo Zheng,Yafei Chen,Qianchun Zhang
A highly sensitive and selective sensor for isobutyraldehyde (IBD) is demonstrated based on intensive cataluminescence (CTL) emission from the surface of nanosized Sm2O3 particles. The characteristics and optimum conditions for the CTL sensor, including the working temperature, wavelength, and flow rate, were investigated in detail. Under the optimized experimental conditions, the CTL intensity varied linearly with the concentration of IBD, in the two-order-of-magnitude range of 0.015–3.9 μg/mL, with a correlation coefficient (r) of 0.99991 and a limit of detection (LOD), at a signal-to-noise ratio (S/N = 3) of 4.6 ng/mL. The sensor was quite specific: butyraldehyde, methanol, ethanol, acetone, formaldehyde, acetaldehyde, benzene, ethylbenzene, and cumene could not produce significant CTL intensities; specifically, butyraldehyde, ethanol, acetone, and acetaldehyde produced low CTL intensities, with values that were 3.8%, 2.8%, 0.60%, and 0.57% that of IBD. As a test of sensor stability, we found that the relative standard deviation (RSD) of 30 measurements of the CTL at an IBD concentration of 1.6 μg/mL within a period of 72 h was 2.2%, indicating good stability and long service life of the sensor. The sensor was tested against spiked samples containing IBD, and recoveries between 89.7% and 97.4% were obtained with an RSD of 6.1%–8.6%. The performance of the sensor indicated its utility for practical sample analysis.
研究领域:
分析化学
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材料科学
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环境监测
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DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 10
·104503
·
IF 3.9
Hao Wang,Enyi Hu,Faze Wang,Bin Zhu
Energy band alignment in ZnO-Sm2O3 was proposed to design promising electrolyte materials for low temperature ceramic fuel cells. The arrangement of energy bands leads to local electric field at the interface, avoiding short-circuit problems and accelerating ion conduction in ZnO-Sm2O3 electrolyte low temperature ceramic fuel cells. The optimized composite electrolyte 7ZnO-3Sm2O3 fuel cell devices an appreciable maximum power density of 790 mW cm−2 and stable power density of 125 mW cm−2 for 40 h at 500 °C.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qin Liu,Zengbin Yin,Fuzhou Guo,Juntang Yuan
β-SiAlON ceramic tool materials were fabricated via spark plasma sintering using binary sintering additives (SmF 3 -Sm 2 O 3 ). The effects of SmF 3 addition and sintering temperature on the densification, phase composition, microstructure and mechanical properties were studied. Furthermore, the corrosion behavior of β-SiAlON ceramic tool materials due to excessive SmF 3 at high sintering temperatures (≥1700 °C) was revealed. The results indicated that SmF 3 could promote the densification and generation of β-SiAlON. Higher SmF 3 content and sintering temperature increased the aspect ratio and average grain size of β-SiAlON, which made fracture toughness increase and Vickers hardness decrease. The best density, fracture toughness and hardness of β-SiAlON ceramic tool materials were 3.204 g/cm 3 , 6.45 ± 0.07 MPa m 1/2 and 16.72 ± 0.09 GPa. However, β-SiAlON was corroded by excessive SmF 3 during high temperature sintering, resulting in deterioration in densification and properties.
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zitao Shi,Zixuan Fang,Shuren Zhang,Bin Tang
Monoclinic Sm 2 O 3 ceramics were prepared using the conventional solid-state sintering method. The influences of sintering temperature on structure, morphology, and performance of Sm 2 O 3 ceramics were studied systematically. The excellent microwave dielectric properties ( ε r = 21.95, Q × f = 47,000 GHz, and τ f = +30.15 ppm/°C) were achieved in Sm 2 O 3 ceramic sintered at 1550 °C for 4 h. Interestingly, varying degrees of cracking were observed after the sintered samples were placed for a short time, with the extent depending on the sintering temperatures. The reasons for cracking were analyzed through chemical bond characteristics and microstructure. The analysis of bond valence and microstructure revealed that Sm 2 O 3 ceramics sintered at higher temperatures exhibited larger bond strain index, global instability index, and interplanar spacings. These results suggest that the cracking of Sm 2 O 3 ceramics originates from inner stress resulting from structural variations caused by variations in sintering temperatures. The effect of MgO addition on microwave dielectric properties and stability of Sm 2 O 3 ceramics was also investigated. Phase identification and elemental distribution indicated that MgO existed as a secondary phase. The Sm 2 O 3 ceramic with 20 wt% MgO addition exhibited optimal microwave dielectric properties: ε r = 17.72, Q × f = 61,100 GHz, and τ f = +2.4 ppm/°C. Importantly, cracking was not observed when MgO addition amounts were 5 wt% or higher. The attractive microwave dielectric properties and favorable stability confirm the possibility of the 5G applications for Sm 2 O 3 /MgO composite ceramics.
研究领域:
材料科学
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电子材料
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
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IF 4.798
Xueliang Li,Zhongqiang Ding,Luyao Zhang,Ruwen Tang,Yang He
A Sm 2 O 3 decorated carbon aerogel (CA-Sm) was successfully synthesized through a sol-gel from resorcinol , phloroglucinol (P), formaldehyde and catalyst of oxalic acid and doping compound with Sm 2 O 3 strategies. The small amount of active reactant phloroglucinol promotes synthesis of carbon aerogel (CA) and formation of uniform and porous carbon spheres. The CA-Sm composites present an interlinked porous structure and high specific surface area. The CA-Sm with sulfur loading (CA/S-Sm) from the composite via molten sulfur technique exhibits an enhanced performance with long-term cycling stability and high rate capacity. In particular, the cathode of CA/S-Sm-2 with Sm/C molar ratio of 2/400 achieved a high initial discharge capacity of 1347 and 976 mAh g −1 at 0.2C and 2C, respectively. And the cathode exhibited a nice long-term cycling stability with a high initial discharge capacity of 1175 mAh g −1 and maintained 861 mAh g −1 after 300 cycles at 0.5C. The excellent electrochemical performance of the battery is attributed to interrelated nanospheres , porous carbon structure, large specific surface area of Sm 2 O 3 -doped CA composites and improved electronic and ionic transport at the cathode.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Xinyu Huang,Weiting Lin,Pengyin Lu,Zhichao Zhao,Jiawei Zhong,Jun Xie,Yong Chen
Robust Ni-based nanocatalysts supported on boron nitride nanosheets (BNNS), modified by Sm 2 O 3 , were synthesized via the co-impregnation and freeze-drying methods. The optimized 8Ni-8Sm 2 O 3 /BNNS catalysts demonstrated remarkable initial catalytic activity during the combined steam and dry reforming of biogas, achieving CH 4 and CO 2 conversions of 95 % and 46 %, respectively, and maintaining stable performance for 200 h. The introduction of Sm 2 O 3 improved the amount of moderately basic sites and enhanced the activation of oxygen-containing molecules including CO 2 and H 2 O, thereby promoting the formation of reactive oxygen species (e.g., O*, OH*) and effectively removing the coke precursors, significantly enhancing the carbon resistance. Moreover, the strong interaction between the small-sized Ni nanoparticles (NPs) and the BNNS support endowed the catalysts with excellent anti-sintering performance. The satisfactory catalytic performance of the 8Ni-8Sm 2 O 3 /BNNS catalysts can be attributed to the surface oxygen vacancies generated by Sm 2 O 3 , the moderately basic sites, and interaction between the highly dispersed Ni NPs and the BNNS support.
研究领域:
催化化学
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能源材料科学
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DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 3
·2088-2101
·
IF 3.9
Yanling Lv,Shixiang Lu,Wenguo Xu,Yulin Xin,Xiaoyan Wang,Shasha Wang,Jiaan Yu
Novel 2D material-based supercapacitors are promising candidates for energy applications due to their distinctive physical, chemical, and electrochemical properties. In this study, a dandelion-like structure material comprised of Sm2O3, Co3O4, and 2D reduced graphene oxide (rGO) on nickel foam (NF) was synthesised using a hydrothermal method followed by subsequent annealing treatment. This dandelion composite grows further through the tremella-like structure of Sm2O3 and Co3O4, which facilitates the diffusion of ions and prevents structural collapse during charging and discharging. A substantial number of active sites are generated during redox reactions by the unique surface morphology of the Sm2O3/Co3O4/rGO/NF composite (SCGN). The maximum specific capacity the SCGN material achieves is 3448 F g−1 for 1 A g−1 in a 6 mol L−1 KOH solution. Benefiting from its morphological structure, the prepared composite (SCGN) exhibits a high cyclability of 93.2% over 3000 charge–discharge cycles at 10 A g−1 and a coulombic efficiency of 97.4%. Additionally, the assembled SCGN//SCGN symmetric supercapacitors deliver a high energy density of 64 W h kg−1 with a power density of 300 W kg−1, which increases to an outstanding power density of 12 000 W kg−1 at 28.7 W h kg−1 and long cycle stability (80.9% capacitance retention after 30 000 cycles). These results suggest that the manufactured SCGN electrodes could be viable active electrode materials for electrochemical supercapacitors.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
·Vol. 48
·期 27
·12146-12152
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IF 2.7
Henan Zhang,Qi Liu,Alena Novoselova,Valeri Smolenski,Kewei Jiang,Yongde Yan,Milin Zhang,Jun Wang
The reactions of oxygen and samarium ions in molten NaCl–2CsCl eutectic in the temperature range of 823–913 K have been investigated by potentiometric titration in an inert gas atmosphere. The activity of oxygen ions in the studied melts was monitored using a standard YZME (indicator) electrode based on Y2O3-stabilized ZrO2 with a solid–electrolyte membrane. The titration of Sm3+ by O2− ions demonstrated the formation of insoluble SmOCl compounds in the investigated region. The mechanism of formation of SmOCl and Sm2O3 was established by the analysis of potentiometric titration curves. Subsequently, the solubility of SmOCl and Sm2O3 in the melt was calculated using the material balance equation and solubility constant equation. Finally, the basic thermodynamic properties of SmOCl and Sm2O3 in molten NaCl–2CsCl eutectic were calculated, and the properties of samarium in the melt were summarized using the Pourbaix-type (E-pO2−) diagram to determine the kinds of stabilized samarium compounds. Furthermore, the optimal chlorination conditions can be obtained from the E-pO2− diagram of Sm.
研究领域:
化学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zi-han Chang,Xing-yu Long,Jing-wen Gu,Mei Zhang,Jiang-qun Zhang,Ting-mei Wang,Yan Zhang,Hui Xie,Yang Li,Pin-hua Xia
Based on the unique affinity interaction between amino (NH 2 ) and metal oxides (MOs) with phosphate groups (PO 4 3− ), herein, Fe 3+ , Fe 2+ and Sm 3+ were respectively usedas metal ion source, polyethyleneimine (PEI) as functional monomer, together with ammonia as precipitant to prepare a novel PEI-functional magnetic rare earth samarium metal oxide composite nano material (PEI/Fe 3 O 4 -Sm 2 O 3 , denoted as PFS) using a “one pot method” for the adsorption study of simulating high concentration glyphosate (GLY) in waterbodies emergency pollution. Consequently, the PFS adsorbent was characterized and analysed successfully using techniques such as SEM, TEM, EDS, BET, XRD, XPS, VSM and so on. A single-factor adsorption experiment was performed to explore how factors like the initial concentration of GLY ( C 0 ), solution pH, adsorbent dosage ( m ), and oscillation time affect PFS's adsorption of GLY. Under the optimized conditions, the adsorption of GLY by PFS could reach up to 92.3 % with a maximum saturated adsorption capacity Q max = 178.5 mg/g. Furthermore, PFS had a certain recyclability after 4 cycles adsorption-desorption of GLY. In addition, the Langmuir model ( R 2 = 0.962) could be better described the adsorption process as examined by isothermal adsorption modelling. The kinetic model fit the pseudo-secondary dynamics well ( R 2 = 0.999), and the adsorption process was spontaneous and endothermic. Besides, we the possible mechanisms of GLY adsorption by PFS were preliminarily explored, which was synergistically promoted by three main adsorption mechanisms, including electrostatic interaction and hydrogen bonding as well as covalent bonding. Morever, PEI-functional magnetic nano-Sm 2 O 3 with high affinity was first used as an adsorbent for GLY due to the synergistic interaction between Sm 2 O 3 and -HPO 3 − , NH 4 + and -HPO 3 − /-COO − . Finally, PFS was used to remove residual GLY in real world water environment (Baiyun lake, Siya river and farmland water) using a convenient and rapid magnetic separation process. The adsorption and removal of GLY in adding standard samples experiments on different substrate waters were above 95 % and could avoid the adverse effects of GLY residues on the aquatic environment. The above results indicated that PEI/Fe 3 O 4 -Sm 2 O 3 , which is a new and excellent nano adsorbent, exhibits a excellent adsorption capacity for GLY, demonstrating a large potential for practical water applications, especially for urgently water bodies polluted with high concentrations of GLY.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Jing Zhang,Sara Paydar,Nabeela Akbar,Chunjie Yan
Nowadays, semiconductor ionic materials have drawn significant attention for developing new electrolytes in low temperature solid oxide fuel cells (LT-SOFCs). Here we investigate the effect of nickel doping on ionic conductivity of Sm 2 O 3 as an electrolyte material for low temperature SOFCs. The amount of Ni ion doping has an intense effect on the electrochemical properties and power generation . An optimized composition of 10 mol% nickel doped samarium oxide (10NSO) as an electrolyte in the fuel cell has a high open circuit voltage (OCV) of 1.09 V and a notable power output of 1080 mW cm −2 at 520 °C. Further investigation revealed that the 10NSO displays a superior ionic conduction up to 0.26 S cm −1 at 520 °C. Moreover, the cell demonstrates high stability up to 80 h. The high electrochemical property and good stability recommend that the NSO is a favorable candidate for symmetrical SOFC electrolyte .
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 11
·E616
·
IF 3.662
Junfeng Li,Mingyong Wang,Jiguo Tu,Shuqiang Jiao
The direct preparation of metallic Sm or alloys from raw oxide Sm2O3 is an attracting but challenging process. The stable electrochemical behavior and low solubility of Sm2O3 limit the extraction of Sm element in molten salts. Here, it is found that metallic Sm is hardly obtained by electro-deoxidation and aluminothermic reduction of solid Sm2O3 pellet according to experiment and calculation. Through the novel electrochemical reduction of solid Sm2O3-Al pellet, Al3Sm alloy with ∼0.4 Sm/Al molar ratio is successfully prepared in calcium chloride melt at 1173 K. The reduction potential of Sm2O3-Al pellet to Al-Sm alloy is more positive than that of calcium. Al plays an indispensable role in the reduction of Sm2O3. The preparation process of alloy can be well identified as two steps: Sm(III) → Sm(II) and Sm(II) → Sm(0). Sm2O3 is firstly converted to Sm(II) based on the combination of electrochemical and aluminothermic reduction. Then, Al3Sm is formed by electrochemical reduction and alloying with Al.
研究领域:
材料科学
·
电化学
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）