JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2019
·
IF 5.04
Xuan Liu,Jilai Xue,Zhichao Guo,Cheng Zhang
This work mainly deals with the segregating behaviors of Sc and the growth of unique primary Al 3 Sc in Al-Sc alloys prepared by molten salt electrolysis. The alloys contain 0.23–1.38 wt%Sc where Sc segregation is observed. It is found that a high current density and long electrolysis time are in favor of high Sc content, and so do the high temperature and the addition level of Sc 2 O 3 . Sc content at the edge of Al based alloy (average Sc content: 0.75 wt%) can be as high as 1.09 wt%, while it is merely 0.24 wt% at the central area. The cooling rates have a strong impact on the morphology and particle size of primary Al 3 Sc, but a weak influence on Sc segregation. The cusped cubic and dendritic primary Al 3 Sc can precipitate in the prepared Al-Sc alloys. In a slightly hypereutectic Al-0.67 wt%Sc alloy, a large and cusped dendrite grows from the edge into the center. The primary and secondary dendritic arms can be as long as 600 and 250 μm, respectively. The Sc segregating behaviors in Al-Sc alloys is due to the mechanism controlled by the limited diffusion rate of Sc in liquid Al. This can involve the establishment of a near spherical discharge interface between liquid Al and the electrolyte. The Sc rich layer near Al-molten salt interface may provide the potential primary nuclei and sufficient Sc atoms for the growth of large dendritic primary Al 3 Sc.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Xiaotian Ma,Shaohua Liu,Xifa Long,Yun Yang
A new mixed alkali metal and rare-earth metal fluoride, Rb 2 Sc 3 F 11 , was successfully synthesized using the high-temperature solution method. It is a rare example containing mixed ScF 7 and ScF 6 groups and crystallizes in the orthorhombic space group Imma (No. 74). Significantly, the optical characterization indicates that Rb 2 Sc 3 F 11 shows a short deep-ultraviolet (DUV) cutoff edge (<200 nm) due to the introduction of the rare-earth scandium and the fluorine with the large electronegativity. It also possesses a moderate birefringence (0.037@532 nm). First-principles calculations were also implemented for a better understanding of the relationship between structure with properties of Rb 2 Sc 3 F 11 .
研究领域:
材料科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Zhonghao Zhang,Xinsheng Li,Sirun Qin,Xiwen Liao,Xiangxi Huang,Duoqiang Liang
A novel method for selective adsorption of zirconium (Zr) from scandium (Sc) in HNO 3 solution was proposed by DPO/SBA-15-N adsorbent which was prepared with SBA-15 and diphosphoryl (DPO) groups through silane coupling method. The results of scanning electron microscopy-energy dispersive spectrometer (SEM-EDS), Brunauer-Emmet-Teller (BET), thermogravimetry (TG) analysis and digestion analysis indicate that DPO/SBA-15-N is an ordered mesoporous adsorbent with a large specific surface area (157.363 m 2 /g) and high functional group content (1.16 mmol/g). In adsorption experiments, DPO/SBA-15-N exhibits high adsorption capacity ( Q = 130.23 mg/g), high separation factor (SF Zr/Sc = 6402) and high adsorption speed (reaching equilibrium within 10 min) for Zr(Ⅳ) in 6 mol/L HNO 3 medium, and the adsorption is better consistent with pseudo-second-order model and Langmuir model. According to the analysis of Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) results, the P‒O and P=O groups in diphosphoryl (DPO) groups play an important role in the selective adsorption process. In conclusion, the adsorbent prepared in this work has great potential for the selective adsorption of Zr(Ⅳ) from Sc(Ⅲ).
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Fukun Li,Ronghe Yang,Jinhang Dai,Hanyue Deng,Junjun Shi,Wucheng Xie,Juanhua Kong,Tingwang Guo
Biomass upgrading, which supplies important biomaterials, chemicals and fuels, is considered as an efficient way to realize the goal of carbon neutralization. Recently, γ-valerolactone (GVL) has gained increasing attention due to its wide applications. In this work, a novel protocol of microwave-assisted cascade catalytic upgrading of α-angelicalactone (α-AL) to GVL over metal triflate using alcohol as the hydrogen donor was proposed. The yield of GVL production from α-AL upgrading is strongly influenced by the Lewis acid strength of the metal triflate and the reduction potential of the employed alcohol. Among all tests, Sc (OTf) 3 showed the best catalytic performance in isopropanol media, giving 96.4 % GVL yield and 100 % α-AL conversion at 433 K within 3.0 h. Meanwhile, kinetic study indicated transfer hydrogenation of isopropyl levulinate to isopropyl 4-hydroxyvalerate was the rate-limited step with the apparent activation energy of 94.5 kJ/mol. This Sc (OTf) 3 catalyst was highly stable and could be reused for five cycles by simple vacuum distillation. In a word, this work provides an alternative for GVL production from biomass upgrading.
研究领域:
生物质化学
·
催化科学
·
可再生资源
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 26
·9030-9036
·
IF 6.4
Jinyi Wang,Xudong Wang,Chenjie Zhang,Xinyu Zhang,Tianliang Zhou,Rong-Jun Xie
Near-infrared (NIR) phosphors play a key role in phosphor-converted NIR emitters, but to find broadband phosphors still remains a great challenge due to the lack of strategies for screening appropriate hosts. Herein, we report a broadband Sr6Sc2Al4O15:Cr3+ NIR phosphor by choosing a host that has crystallographic sites accommodated for both Ce3+ and Cr3+ simultaneously. The emission spectrum of Sr6Sc2Al4O15:Cr3+ covers the region of 600–1500 nm, having a maximum at 860 nm and a full width at half-maximum (FWHM) of 241 nm. A NIR pc-LED was fabricated by combining the Sr6Sc2Al4O15:Cr3+ phosphor with a blue LED, which can produce a NIR output power of 0.16 mW driven at 750 mA. The fabricated NIR emitter demonstrates a good suitability in night vision and non-destructive detection.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhe Sun,Heyu Li,Aaron S. Pittman,Yan Cao
Scandium is a rare earth element that is relatively scarce on Earth. The need for its rapid qualitative detection has increased dramatically owing to its extensive use in various high-tech sectors and potential environmental concerns. This work aims to develop a portable, simple, low-cost specific detection sensor for on-site qualitative detection of Sc 3+ ions. Multiple carbon dots were synthesized via the “bottom-up” hydrothermal method and characterized by morphology, structure, and optical properties. The characteristic structure of “salicylic acid” was determined as the core of the Sc 3+ selective detection function through precursor molecular engineering design. Further investigation was conducted into the impact of various factors on the Sc 3+ specific fluorescence detection performance of related derived carbon dots, including the electronic and spatial effects of various substituents on the aromatic skeleton of precursor molecules and the size of aromatic conjugated systems. The detection performance of carbon dots derived from different precursor sources was compared, and the optimal carbon dots derived from 2-hydroxy-3-naphthoic acid were selected, with a lower detection limit (4.38 ppb) and a significant blue shift (from green visible light to blue visible light range). On this basis, a portable device capable of detecting Sc 3+ ions, the 2-3-CDs PVA membrane, was developed. Our work presents the first discovery of carbon dots as Sc 3+ ion fluorescence sensors, providing new insights and beneficial results for subsequent rare earth element detection.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2018
·Vol. 5
·期 8
·1787-1794
·
IF 5.106
Yanna Chen,Min Zhang,Cong Hu,Zhihua Yang,Shilie Pan
As the first reported examples of borates in the Zn–Sc–B–O system, Ba2ZnSc(BO3)3 and Ba4Zn5Sc2(BO3)8 were synthesized through a high-temperature solution method. The structure of Ba2ZnSc(BO3)3 can be described as ZnO4 tetrahedra connecting ScO6 octahedra to form a [ZnScO9]13− dimer, which further bonds with seven BO3 triangles to form a 2∞[ZnSc(BO3)3] layer, and the Ba atoms distribute in the voids between the layers. In contrast, in Ba4Zn5Sc2(BO3)8, Zn–O chains composed of 4- and 6-coordinated Zn atoms link with Sc2O8 dimers to form a Zn–Sc–O layer, and the BO3 triangles and Ba atoms fill in the voids between the layers. Interestingly, the special [Zn2(BO3)6]14− cluster is found in Ba2ZnSc(BO3)3, which is different from the 2D layers or 3D frameworks of the Zn–B–O configurations in other zincoborates. Moreover, the lowest-coordinated ScO5 polyhedra, as well as the coexistence of two types of ZnOn units (n = 4 and 6), are observed for the first time in Ba4Zn5Sc2(BO3)8. These fascinating results can promote the design of novel borates with BO3 units and enrich the borate structure chemistry.
研究领域:
材料科学
·
晶体化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Longwen Wu,Xiaohui Wang,Longtu Li
Core-shell BaTiO 3 @BiScO 3 (BT@BS) particles were fabricated via a facile sol-precipitation method, with which bulk ceramics were prepared via conventional sintering. Pure perovskite phases of the BT@BS ceramics were confirmed by XRD patterns. Grain sizes and DC conductivities of the BT@BS ceramics are suppressed in comparison with pure BT. Dielectric-temperature measurements show that with the addition of BS, the tetragonal-orthorhombic and orthorhombic-rhombohedral peaks sequentially disappear with gradual broadening and dispersion of Curie peaks. Wide and flat dielectric-temperature plateau is achieved in the ceramic with 3 mol% BS coatings, which is due to the formation of local compositionally graded structure from the modulated diffusion of Bi and Sc. Weakened polarization nonlinearity and reduced hysteresis are achieved in the BT@BS ceramics, which contribute to enhanced energy storage capability. This work provides a generic avenue for fabricating temperature-stabilized dielectrics with improved energy storage density.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2022
·Vol. 66
·期 2
·672-678
·
IF 8.64
Yao Shuang,Tang Ting,Shen Yongli,Yang Fan,An Changhua
Photocatalytic reduction of oxygen represents a promising way to produce hydrogen peroxide (H 2 O 2 ) owing to the merits of energy saving and environmental benignancy. However, the low activity and selectivity of the photocatalyst impede its practical application. Herein, following the principle of metal ion-coupled electron transfer, we have fabricated a class of graphitic carbon nitride (g-C 3 N 4 ) decorated with atomically dispersed scandium Lewis acid (Sc/H-CN) using a facile impregnation-calcination method. The as-synthesized Sc/H-CN exhibits excellent H 2 O 2 production performance with a rate of 55 µmol h −1 , which is 6.2 times over bare CN. The improved performance is ascribed to the enhancement of O 2 electron-accepting capability through binding of Sc Lewis acid sites with intermediate ·O 2 − , inhibiting its reverse reaction. Moreover, density function theory (DFT) calculation and Koutecky-Levich analysis show that the reduced O−O bond breakage is responsible for the high selectivity in the production of H 2 O 2 . This work provides a new strategy for the design of photocatalysts equipped with appropriate active sites towards various applications.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 5
·6047-6054
·
IF 2.478
Yin Hao,Wang Yuan,Kuang Bo,Yuan Baoping,Mao Lulu,Ma He,Hu Querui,Huang Jun
The 5.4BiScO 3 −(94.6- x )PbZrO 3 − x PbTiO 3 (43.0 < x < 51.0 mol%) ternary piezoelectric ceramics were synthesized by solid-state reaction method. Phase transition from rhombohedral to tetragonal structure was identified by X-ray diffraction. In combination with piezoelectric and dielectric properties, the morphotropic phase boundary (MPB) composition was confirmed in 5.4BiScO 3 −47.6PbZrO 3 −47.0PbTiO 3 ceramic with optimal piezoelectric coefficient d 33 of 474 pC/N, relative dielectric constant ε r of 1666, mechanical coupling factor k p of 0.64 and mechanical quality factor Q m of 415 at room temperature. Besides, the 5.4BiScO 3 −47.6PbZrO 3 −47.0PbTiO 3 ceramic retained most of the piezoelectric properties in broad temperature range between 40 and 300 °C, which exhibited excellent thermal stability. There were only gentle variations in d 33 (Δ d 33 /d 33 = 10.6%), k p (Δ k p /k p = 14.1%), Q m (Δ Q m /Q m = 10.3%), and ε r (∂ ε /∂ T = 13.2/°C) at 300 °C, indicating BiScO 3 doping in PbZrO 3 −PbTiO 3 binary system could form a potential candidate for high temperature applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Advanced Science
·
2024
·Vol. 12
·期 8
·2411960
·
IF 14.3
Chen-Yi Zhao,Chun-Li Hu,Nian-Tzu Suen,Xiao-Hui Li,Hai-Ping Xu,Wenfeng Zhou,Sheng-Ping Guo
Chalcogenides are the most important infrared nonlinear optical (NLO) material candidates, and the exploration of high-performance ones is attractive and challengeable. Hitherto, there is no NLO scandium (Sc) chalcogenides experimentally studied. Here, new quaternary Sc thiophosphate CsScP 2 S 7 (CSPS) was synthesized by the facile metal oxide-boron-sulfur/reactive flux hybrid solid-state method. It crystallizes in the monoclinic chiral space group C 2, and the layered structure is composed by the new ScP 2 S 11 functional motifs built by ScS 6 octahedra and P 2 S 7 dimers, and the structure-performance analysis reveals that the hyperpolarizability of ScP 2 S 11 is much greater than the assembled units (ScS 6 and PS 4 ), which makes the first NLO Sc chalcogenide CSPS exhibits strong NLO response (0.8 × AGS) and high laser-induced damage threshold (LIDT) (4.3 × AGS), and a wide bandgap of 3.10 eV. With the coordination number's reduction of rare-earth (RE) ion and the rearrangement of P 2 S 7 dimers, the centrosymmetric structure of CsREP 2 S 7 family can be broken via substitution with the smallest RE element Sc to form the noncentrosymmetric structure. This work not only discovers a new high-performance infrared NLO material, but also will inspire researchers to explore more potential NLO Sc chalcogenides.
研究领域:
材料科学
·
晶体学
✓ 已验证
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 25
·2001551
·
IF 11.459
Shahid Ullah Khan,Waheed Ullah Khan,Wasim Ullah Khan,Dilfaraz Khan,Sumbul Saeed,Syed Badshah,Muhammad Ikram,Tawfik A. Saleh
The luminous efficiency of inorganic white light-emitting diodes, to be used by the next generation as light initiators, is continuously progressing and is an emerging interest for researchers. However, low color-rendering index (Ra), high correlated color temperature (CCT), and poor stability limit its wider application. Herein, it is reported that Sm 3+ - and Eu 3+ -doped calcium scandate (CaSc 2 O 4 (CSO)) are an emerging deep-red-emitting material with promising light absorption, enhanced emission properties, and excellent thermal stability that make it a promising candidate with potential applications in emission display, solid-state white lighting, and the device performance of perovskite solar cells (PSCs). The average crystal structures of Sm 3+ -doped CSO are studied by synchrotron X-ray data that correspond to an extremely rigid host structure. Samarium ion is incorporated as a sensitizer that enhances the emission intensity up to 30%, with a high color purity of 88.9% with a 6% increment. The impacts of hosting the sensitizer are studied by quantifying the lifetime curves. The CaSc 2 O 4 :0.15Eu 3+ ,0.03Sm 3+ phosphor offers significant resistance to thermal quenching. The incorporation of lanthanide ion-doped phosphors CSOE into PSCs is investigated along with their potential applications. The CSOE-coated PSCs devices exhibit a high current density and a high power conversion efficiency (15.96%) when compared to the uncoated control devices.
研究领域:
材料科学
·
光学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）