JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Hongxia Li,Lijiang Guo,Lu Luo,Zongying Zhou
The solid–liquid phase behavior of the NaF–Na3PO4–H2O ternary system and its binary subsystems NaF–H2O and Na3PO4–H2O at 308.15, 323.15, and 348.15 K has been measured by the isothermal dissolution equilibrium (IDE) method. Compared with the measured solid–liquid phase behavior data, the previously reported results have been evaluated and the unreasonability has been discussed. The phase diagrams at the investigated temperatures for this ternary system are drawn according to the measured solid–liquid phase behavior and the corresponding wet solid and liquid-wet solid–solid lines. From the phase diagrams, it is found that at a given temperature, there are three types of equilibrium solid phases, NaF(s), double salt 2Na3PO4·NaF·19H2O(s), and Na3PO4·12H2O(s) in the ternary system. Accordingly, there are two cosaturated points for NaF(s) and double salt 2Na3PO4·NaF·19H2O(s), double salt 2Na3PO4·NaF·19H2O(s) and Na3PO4·12H2O(s), respectively. The comparison of phase diagrams at different temperatures suggests that, with the rise of temperature, the double salt crystal region became a little bit larger, and correspondingly, the crystal regions of pure salt (NaF(s) and Na3PO4·12H2O(s)) became smaller, which is not beneficial to the separation of fluoride and phosphate. This indicates that the fluoride and phosphate separation process should be at lower temperatures.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
Silicon
·
2025
·
IF 3.3
Yang Yonghui,Fan Chao,Yang Pengchen,Liu Zhanwei,Yan Hengwei
This study investigated the effect of aluminum oxide (Al 2 O 3 ) additives on the properties of NaF-AlF 3 -SiO 2 melts. The liquid-phase line temperature was determined through thermal analysis, while the solubility and volatilization loss of silicon dioxide (SiO 2 ) were evaluated using the rotating quartz disk method and volatilization experiments. The dissolution mechanism of Al 2 O 3 in the melt was explored through thermodynamic analysis and experimental validation. The results indicated that Al 2 O 3 addition significantly decreased liquid-phase line temperature, enhanced SiO 2 solubility, and reduced volatilization losses. These findings provide a theoretical basis for optimizing the electrolysis process of Al–Si alloys, which contribute to improved melt performance, enhanced energy efficiency, and reduced volatilization losses, thereby promoting increased efficiency in industrial applications.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2019
·Vol. 72
·期 1
·239-246
·
IF 2.305
Peng Jianping,Wei Zheng,Di Yuezhong,Wang Yaowu,Sun Ting
NaF-KF-LiF-AlF 3 -based low-temperature electrolytes have attracted great interest because of their potential to optimize and improve current industrial aluminum production methods. In the present study, the saturated alumina solubility in quaternary NaF-KF-LiF-AlF 3 -based melts (total cryolite molar ratio \( {\text{CR}} = \left( {n_{\text{NaF}} + n_{\text{KF}} + n_{\text{LiF}} } \right)/n_{{{\text{AlF}}_{3} }} \) of 1.3) with both KF and LiF content of 0 mol.% to 20 mol.% were evaluated by measuring the weight loss of a rotating corundum disk over the temperature range of 800–920°C. The effects of the KF content, LiF content, and temperature on alumina solubility are discussed in detail. The results fit well with the following empirical equation within the temperature of 830–890°C: ω (Al 2 O 3 ) sat = A × ( t /1000) B , where A = 0.3101[KF] − 0.1254[LiF] − 0.0057[KF] 2 + 0.0028[LiF] 2 + 4.486, B = 0.3839[KF] + 0.0368[LiF] − 0.0140[KF] 2 + 0.0057[LiF] 2 + 4.913, and t is the temperature in Celsius. Alumina solubility diagrams at various temperatures are illustrated based on the empirical regression equation obtained. Finally, some problems and challenges preventing the application of these low-temperature melts in industry are discussed.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wei Liu,Qiao Wang,Quan Ouyang,Xin Zhang,Yaowen Wang,Haitong Tang,Tianmin He,Chuang Yu,Guangshe Li,Liping Li
Na 3 Zr 2 Si 2 PO 12 (NZSP) shows great potential as candidate of solid electrolyte for solid-state sodium batteries. Herein, a high density NZSP solid electrolyte with space group of C2/c is synthesized by a new strategy. Such new strategy rivets most of NaF at the grain boundaries, effectively increasing the density of NZSP pellets. A small amount of F - doped into the lattice alters the lattice parameters of NZSP. The riveted NaF and doped F - cooperatively enhance the ionic conductivity of NZSP solid electrolyte. The optimized NZSP solid electrolyte, containing 3 wt%NaF additives and sintered at 1050 °C, exhibits a room-temperature Na + conductivity of 7.2×10 −4 S cm −1 and low activation energy of 0.23 eV. The solid-state battery using the optimized sample NZSP+3 wt%NaF as solid electrolyte has a wide electrochemical window of up to 7.0 V ( vs . Na + /Na) and ultra-stable cycling capability towards the bare sodium metal. The corresponding symmetrical battery demonstrates stable and reversible cycle at 0.2 mA cm −2 for 700 h with negligible voltage polarization, the longest cycling time reported to date at this current density. At current density of 0.08 mA cm −2 (0.5 C), all-solid-state battery of Na 3 V 2 (PO 4 ) 3 /NZSP+3 wt%NaF/Na can deliver a discharge capacity of 62 mAh g −1 after 60 cycles. The interfacial rivet method offers valuable insights and inspiration for the development of other types of ceramic solid electrolytes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 25
·11774-11782
·
IF 4.682
Liu Limin,Liang Dongshi,Zhou Xiaoliang,Liu Yujian,Su Jiawen,Xu Yao,Peng Jinsong
NASICON-type material Na 1+ x Zr 2 Si x P 3− x O 12 (0 ≤ x ≤ 3) is considered to be one of the most promising solid-state electrolytes that can be applied in all-solid-state sodium batteries (SSNBs). However, further increasing the ionic conductivity of Na 1+ x Zr 2 Si x P 3− x O 12 (0 ≤ x ≤ 3) to obtain higher performance electrolyte materials is still a challenge for its practical application. Herein, the Na 3.4 Zr 2 Si 2.4 P 0.6 O 12 (NZSP) powder is prepared by the solution-assisted solid-state reaction (SA-SSR), and solid-state electrolytes with excellent electrochemical properties are obtained by doping with NaF as a sintering aid. With the increase of NaF doping, the crystal structure of NZSP is changed as well as a slight excess of Na + may increase the bottleneck size of the crystal, so that it enhances the migration ability of Na + in the crystal. Also, NaF as a sintering aid lowers the sintering temperature, increases the densities and improves the effective contact between crystals, which reduces the grain boundary impedance of NZSP. However, the excessive NaF dopant leads to the generation of microcracks decreasing the Na + conducting and mechanical properties of solid-state electrolytes. Using this simple and low-cost strategy of NaF doping, NZSP-0.3NaF achieves an excellent conductivity of 4.98 mS cm −1 with unexpectedly low activation energy of 0.227 eV. Therefore, this composition is one of the few electrolytes with high conductivity reported so far and is a competitive option for solid-state sodium batteries.
研究领域:
材料科学
·
电化学
·
固态离子学
·
能源材料
·
无机非金属材料
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
Minghui Ye,Shunzhang You,Jiaming Xiong,Yang Yang,Yufei Zhang,Cheng Chao Li
As a kind of high-voltage cathode for sodium-ion batteries (SIBs), the instability of a cathode–electrolyte interface (CEI) of Prussian blue (PB) results in the consumption of electrolyte and poor cycling life. Herein, an artificial NaF-rich CEI is in-situ designed on a PB cathode via a chemically presodiated strategy to remarkably prolong the cycling life of SIBs. Based on a spontaneous redox reaction between a chemical presodiation solvent and a polyvinylidene fluoride (PVDF) binder, a homogeneous, thin, and NaF-rich CEI is conformally coated on the surface of PB, forming CEI@PB. The components of CEI within CEI@PB mainly comprise inorganic Na-salts (NaF, Na 2 CO 3 , and NaHCO 3 ) and organic Na-based species (R-O-Na, R–CO–Na, and R–O 2 CO–Na), which can ensure the rapid transport of Na + ions while effectively preventing CEI@PB against the attack of organic solvent and improving its cycling stability. Besides, density functional theory calculations also reveal that NaF is a good electronic insulator and ionic conductor , which is suitable as a stable CEI. Benefiting from the aforementioned merits, the CEI@PB cathode with a high areal capacity of 0.61 mAh cm −2 delivers an ultra-long cycling life of 3000 cycles. More importantly, the concept of in-situ CEI can be extended to other cathodes beyond Na batteries discussed herein.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 6
·4230-4241
·
IF 4.186
Zhanglin Chen,Zhaobo Tian,Jie Zhang,Fei Li,Songmo Du,Shijia Zhang,Kaiming Zhu,Wei Cui,Xuanyi Yuan,Kexin Chen,Guanghua Liu
A novel deep-red-emitting phosphor Ca 2 ScNbO 6 :Mn 4+ is prepared via a high-temperature solid-state reaction and its luminescent properties are systematically investigated. The results show that Mn 4+ -activated Ca 2 ScNbO 6 phosphors have broad absorption in ultraviolet region, and show bright deep-red emission at 692 nm. The optimal doping concentration, crystal-field strength, internal quantum efficiency, and mechanism of concentration and thermal quenching effects are discussed in detail. Moreover, NaF flux is screened out to improve both luminescent intensity and morphology of the phosphor. Finally, a red light-emitting diode (LED) lamp is fabricated with as-prepared Ca 2 ScNbO 6 :Mn 4+ phosphors and a 365 nm LED chip. The electroluminescence spectra show a good overlapping with phytochrome P R and P FR absorbance. The results provided the as-synthesized Ca 2 ScNbO 6 :Mn 4+ phosphors a great potential in plant growth lighting.
研究领域:
材料科学
·
光学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Magnesium and Alloys
·
2023
·
IF 17.6
Chao Yang,Jian Huang,Suihan Cui,Ricky Fu,Liyuan Sheng,Daokui Xu,Xiubo Tian,Yufeng Zheng,Paul K. Chu,Zhongzhen Wu
In the present research, the NaF assisted plasma electrolytic oxidation (PEO) is designed to fabricate the high-content ZnO nanoparticles doped coating on AZ31B alloy. The microstructure, phase constituents and corrosion behavior of the PEO coatings are investigated systematically. The results reveal that the introduction of NaF promotes the formation of MgF 2 nanophases in the passivation layer on Mg alloy, decreasing the breakdown voltage and discharge voltage. As a result, the continuous arcing caused by high discharge voltage is alleviated. With the increasing of NaF content, the Zn content in the PEO coating is enhanced and the pore size in the coating is decreased correspondingly. Due to the high-content ZnO doping, the PEO coating protected AZ31B alloy demonstrates the better corrosion resistance. Compared with the bare AZ31B alloy, the high-content ZnO doped PEO coated sample shows an increased corrosion potential from -1.465 V to -1.008 V, a decreased corrosion current density from 3.043×10 -5 A·cm -2 to 3.960×10 -8 A·cm -2 and an increased charge transfer resistance from 1.213×10 2 ohm·cm 2 to 2.598×10 5 ohm·cm 2 . Besides, the high-content ZnO doped PEO coated sample also has the excellent corrosion resistance in salt solution, exhibiting no obvious corrosion after more than 2000 h neutral salt spraying and 28 days’ immersion testing. The improved corrosion resistance can be ascribed to the relative uniform distribution of ZnO in PEO coating which can transform to Zn(OH) 2 and form a continuous protective layer along the corrosion interface.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 18
·9611-9617
·
IF 2.936
Ji-Wei Shen,Zhiqing Wang,Xiaoxuan Wei,Jiawei Liu,Yinmao Wei
Herein, user-friendly control of the synthesis of sub-10 nm hexagonal (β-) NaYbF4:Er nanocrystals (NCs) with extremely low-level Gd3+ doping (0%, 10 mol%) was achieved. We reveal for the first time that the effective sodium/fluoride levels during the formation of cubic (α-) nuclei are not only controlled by the sodium/fluoride to rare-earth precursor ratios used, but also sensitively restricted by the in situ NaF generation reaction in a sodium oleate-based solvothermal system. Excessive in situ NaF generation will lead to a respective sodium- and fluoride-deficient environment, delayed α-to-β transition and larger β-NCs. Based on these effects, sub-10 nm monodisperse low-level Gd3+-doped β-NaYbF4:Er was obtained with a user-friendly low fluoride dosage by finely balancing this NaF generation reaction and achieving an intrinsic optimized sodium-fluoride level for NC nucleation. Notably, our work represents the first example where the focus is on the competing in situ NaF generation reaction and its use for nucleation regulation, as well as for the user-friendly control of the solvothermal synthesis of sub-10 nm β-NaYbF4:Er.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jiangping Song,Mengjun Wu,Kan Fang,Tian Tian,Rui Wang,Haolin Tang
Red phosphorus/carbon (P/C) materials have been extensively studied as promising anodes for sodium-ion batteries (SIBs) owing to their high capacities and moderate working potentials. However, the low initial Coulombic efficiency (ICE) and unstable solid-electrolyte interphase (SEI) of P/C composites limit their widespread applications. In this study, we develop an effective presodiation method to compensate for the irreversible sodium loss of the S-doped P/C (P/C@S) anode and yield a thin, uniform, and NaF-rich SEI layer on the presodiated P/C@S (pNa-P/C@S) anode during cycling. Consequently, the pNa-P/C@S anode exhibits a remarkable ICE of 98.7% as well as superior cycling performance and rate capability in the half cell. When pNa-P/C@S anode is coupled with conventional Na 3 V 2 (PO 4 ) 2 F 3 , Na 3 V 2 (PO 4 ) 3 , and NaCu 0.12 Ni 0.23 Fe 0.33 Mn 0.33 cathodes, all the full cells demonstrate desirable ICEs (>98%), high energy densities, and excellent cycling performance. The proposed method has been extended to another anode (SnO 2 ) to demonstrate its applicability in fabricating anodes with a high ICE and stable NaF-rich SEI layer.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
STEEL RESEARCH INTERNATIONAL
·
2024
·
IF 1.9
Qiuping Li,Zhe Wang,Zerong Duan,Haoyan Yang,Guanghua Wen,Ping Tang,Zibing Hou
Low-basicity fluorine-containing mold flux, which forms a porous slag film with NaF pores, is expected to solve the contradiction between heat transfer and lubrication in the continuous casting of peritectic steel. Herein, the kinetic mechanism and the influence of NaF gas formation based on the different fluorine raw materials (NaF, CaF 2 , and Na 3 AlF 6 ) at 0.9 basicity and 6 wt% fluorine are investigated by the combination of experiments and calculations. The results show that CaF 2 is the first to generate NaF gas at 1189 K, followed by Na 3 AlF 6 (1238 K) and NaF (1328 K). NaF raw material produces the most NaF gas with the lowest activation energy in the three raw materials, due to high Na ion kinetic energy, the simple degree of polymerization, and Na-F 1 bonds. Correspondingly, NaF bubbles in the molten slag are the largest based on their aggregation. Na 3 AlF 6 and CaF 2 raw materials rank second and third, with F atoms primarily bonded as Al-F x and Ca-F x and the higher proportion of Q Si − O − Al 2 $Q_{\text{Si} - \text{O} - \text{Al}}^{2}$ and Q Si − O − Si 4 $Q_{\text{Si} - \text{O} - \text{Si}}^{4}$ structure. Notably, at 0.9 basicity and 6 wt% fluorine, Na 3 AlF 6 as raw material generates a suitable amount of gas, making diffuse and fine NaF bubbles in the molten slag.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Guang Yang,Yongwei Liu,Chuanfan Yang,Fang Xia,Yupeng Wu,Yaroslav Shpotyuk,Viktor Takats,Huidan Zeng,Yinsheng Xu,Hongfei Chen,Yanfeng Gao
This work presents the influence of glass matrix SiO 2 –B 2 O 3 –NaF on the formation of near-infrared (NIR)-shielding functional units in energy-saving glass windows. The structural analyses by XRD , XPS , and Raman confirmed that the NIR-shielding performance is insensitive to SiO 2 or B 2 O 3 glass network formers but is significantly impacted by the concentration of NaF. This is because the presence of a reasonable amount of NaF provides the much-needed sodium for the formation of NIR-shielding functional units Na 5 W 14 O 44 but too much NaF (>22 mol.%) can inhibit the formation of Na 5 W 14 O 44 by transforming the W– O –W chain in the interconnected [WO 6 ] and [WO 4 ] polyhedrons into W–O - bonds. By adjusting NaF to the optimal level (16 mol.%) and adding only a small amount of H 2 WO 4 (1.9 mol.%) as the tungsten source in the raw materials, excellent optical properties and thermal insulation performance have been achieved in the produced bulk glass, with a high transmission of 65.8% at 550 nm in the visible light region and a low transmission of 6.6% at 1550 nm in the NIR region. This performance is much better than soda lime glass and ITO glass and is comparable to cesium tungsten bronze-based membrane coated glass. This study paves a way for glass composition design to achieve high NIR-shielding performance with the minimum amount of tungsten source, leading to cost-effective glass fabrication and enhanced mechanical strength of energy-saving glass windows.
研究领域:
材料科学
·
玻璃工程
✓ 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）