ACS Applied Optical Materials
·
2024
·
IF 0
Xunsheng Zhou,Binqing Zhao,Lu Yao,Wanting Gui,Longfei Chen,Chao Li,Shi Zhang,Cai Lin Wang
Eutectic scintillators with 6Li-containing thermal neutron absorbers are capable of efficient thermal neutron detection due to lamellar or rod-like optical waveguide structures formed by directional solidification. However, developing stable and bright eutectic scintillators with excellent neutron imaging capability remains a challenge. Here, the performance parameters for the scintillator have been substantially improved by the Al3+ codoping strategy in the LiF-CaF2:Eu2+ system. Due to the Al3+ codoping, the photoluminescence quantum yield (PLQY) is enhanced from 55% to 80%, the light yield is increased from 11,000 to 16,000 photons/thermal neutron, and the scintillation decay time is shortened by about 30 ns. It was shown that Al3+ codoping can effectively reduce the low-frequency shallow-energy level traps. Furthermore, large-sized (50 × 50 × 1.5 mm) translucent LiF-CaF2:Eu2+, Al3+ eutectic ceramics have been fabricated for an Anger-logic position-sensitive detector to realize two-dimensional (2D) thermal neutron detection. A codoped LiF-CaF2 eutectic scintillator provides a ∼1 mm spatial resolution and thermal neutron detection efficiency 16% higher than that of a commercial GS20 scintillator. This research paves the way for the application of large-area eutectic scintillators for efficient thermal neutron detection.
研究领域:
材料科学
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核物理
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光学
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DOI
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2021
·Vol. 52
·期 5
·3490-3496
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IF 2.47
Yan Hengwei,Huang Liqiang,Ma Wenhui,Liu Zhanwei,Qin Bo
The NaF-KF-AlF 3 -based electrolyte is a promising low-temperature electrolyte for aluminum reduction. The solubility and dissolution rate of alumina in NaF-KF-AlF 3 -LiF-CaF 2 melt with a cryolite ratio (CR) ranging from 1.5 to 1.8 were investigated by the rotating corundum disk method at 1073 K to 1153 K. The effect of the composition and temperature of the melt on the solubility and dissolution rate of alumina were discussed. The results show that the solubility and dissolution rate of alumina in the melt decrease with the increase of LiF and CaF 2 content, and the effect of LiF on the alumina solubility is greater than that of CaF 2 . The decrease of the CR and temperature lead to a marked reduction of the alumina solubility and alumina dissolution rate. The dissolution rate of alumina depends on the dissolution rate in the first 5 minutes. The alumina dissolution is a zero-order reaction in the first 5 minutes, and a first-order reaction in the next 30 minutes.
研究领域:
材料科学
·
冶金工程
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
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IF 3.3
Jing Pan,Yongde Yan,Yuan Deng,Xuepeng Wang,Li Ding,Xin Kong,Yun Xue,Fuqiu Ma,Kai Zhu,Wei Liu
Electrolyte is considered to be one of the key factors affecting electrolysis in the rare earth and their alloys industry. Generally, the fluoride system is chosen as the electrolyte for industrial production. However, the molten salt electrolysis method for fluoride-oxide systems is not well understood and has not been systematically studied at this stage. In order to supplement this part, lanthanum (La) ions have been chosen as the research object in this paper to systematically investigate the preparation of La–Ni alloy from LaF3–LiF-CaF2–La2O3 molten salt. A series of electrochemical methods were used to investigate the mechanism and kinetic properties of La(III) reduction on W and Ni electrodes. The electrochemical reduction properties and kinetic parameters of La were obtained. La–Ni alloy was prepared by potentiostatic electrolysis, and it was verified by detailed analysis through characterization methods. On this basis, LaNi5 intermetallic compound was successfully prepared on Ni electrode. This study provides valuable theoretical guidance for the development of La alloy preparation with fluoride salt systems in industry.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 8.3
Jing Pan,Yongde Yan,Yanghai Zheng,Shengrong Guo,Xuepeng Wang,Sihao Wang,Zhiguang Du,Kaijie Wang,Yun Xue,Kai Zhu
A method for the preparation of LaNi 5 alloy by molten salt co-reduction is reported. The electrochemical co-reduction process of La(III) and Ni(II) as well as the reaction process of intermetallic compounds formation were investigated. It was confirmed that the diffusion coefficient of La(III) in LiF–CaF 2 molten salt is 4.684–8.098 × 10 −5 cm 2 s −1 at temperatures of 1113–1183 K. And the reaction activation energy was obtained to be 78.86 kJ mol −1 . And, the exchange current densities of La(III)/La(0) were determined by the Tafel (0.149–0.251 A cm −2 ) and linear polarization (0.143–0.204 A cm −2 ) methods. Furthermore, five different La–Ni intermetallic compounds were detected by studying the co-reduction reaction of La(III) and Ni(II) ions. Meanwhile, the formation potentials of La–Ni intermetallic compounds were defined by various electrochemical tests. In addition, the LaNi 5 alloy was obtained via potentiostatic electrolysis according to the electrochemical results. This study provides new insights into the electrochemistry of the LiF–CaF 2 –LaF 3 –NiF 2 molten salt and enhances the understanding of the molten salt electrolytic preparation of La–Ni alloys from co-reduction.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
He Sun,Yusheng Yang
Neodynium oxyfluoride has been applied for luminescence materials and solid electrolytes because of its structure combined advantages of rare-earth cations with F − and O 2− anions. Since the neodynium oxyfluoride with tetragonal structure retains a defect structure having anion vacancies where anions transfer, it shows higher anion conductivity than that with cubic and rhombohedral structures. The feasibility of synthesizing tetragonal neodynium oxyfluoride in molten fluorides was investigated in this work. The neodynium oxyfluoride was not dissolved in molten LiF–CaF 2 based on the in-situ observation using confocal scanning laser microscope, therefore neodynium oxyfluoride can be easily collected from molten fluorides. The neodynium oxyfluoride with tetragonal structure was successfully synthesized by the reaction of Nd 2 O 3 with molten fluorides. The synthesis process was analyzed by differential scanning calorimetry combining X-ray diffraction and scanning electron microscope. The reaction model was described and the reaction rate constant was calculated. According to the mathematical description of kinetic equation, the reaction rate could be proportional to the interface difference between molten fluorides and solid Nd 2 O 3 .
研究领域:
材料科学
·
固体化学
·
电化学
✓ 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）