JOURNAL OF LUMINESCENCE
·
2014
·
IF 2.367
Jiansheng Huo,Jiadan Zhu,Shunhua Wu,Haijie Zhang,Qianming Wang
Red emissive phosphors of YTa 1− x Nb x O 4 :Eu 3+ ( x =0–1) have been successfully synthesized by a molten salt method. Powder characteristics were studied by X-ray diffraction, scanning electron microscopy and photoluminescence spectroscopy. The effects of Nb concentration ( x ), flux nature and firing temperature on photoluminescence behavior of YTa 1− x Nb x O 4 :Eu 3+ were extensively investigated. The results showed that the photoluminescence spectra of the samples exhibited strong red emissions (615 nm) upon the ultraviolet excitation and the emission intensities strongly dependent on the host-lattice composition and particle morphology .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2014
·Vol. 9
·期 1
·1-5
·
IF 2.481
Wang Yanming,Wang Yajing,Wang Fei
Well-crystallized Li 2 NiTiO 4 nanoparticles are rapidly synthesized by a molten salt method using a mixture of NaCl and KCl salts. X-ray diffraction pattern and scanning electron microscopic image show that Li 2 NiTiO 4 has a cubic rock salt structure with an average particle size of ca. 50 nm. Conductive carbon-coated Li 2 NiTiO 4 is obtained by a facile ball milling method. As a novel 4 V positive cathode material for Li-ion batteries, the Li 2 NiTiO 4 /C delivers high discharge capacities of 115 mAh g -1 at room temperature and 138 mAh g -1 and 50°C, along with a superior cyclability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Keke Guan,Wen Lei,Honghong Wang,Xuefeng Liu,Jin Luo,Jianghao liu,Quanli Jia,Haijun Zhang,Shaowei Zhang
In this work, Ti 3 AlC 2 powders with high purity were prepared by microwave-assisted molten salt method (MA-MS). The synthesis parameters (such as raw materials ratio, heating temperature and reactant materials) and the formation mechanisms were systematically investigated. The results indicate that Ti 3 AlC 2 powders with a high purity up to 98.5% are prepared using TiH 2 /Al/1.8TiC mixture as reactant materials, and NaCl–KCl as molten salt by microwave-assisted heating at 1050 °C for 30 min. Compared with traditional heating methods, both the synthesis temperature and holding time of highly pure Ti 3 AlC 2 powders synthesized in this work are much milder. This high-efficiency synthesis approach could be ascribed to the synergistic effect of molten salt and microwave heating. Moreover, the TiH 2 –Al–TiC starting material is more suitable for the rapid synthesis of Ti 3 AlC 2 powders with high purity via present microwave-assisted molten salt method than that TiH 2 –Al–C.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yanzi Tang,Jincui Ren,Weixiang Yang,Yunuo Yang
TaC whiskers were prepared using the molten salt method with Ta 2 O 5 , activated carbon, NaCl/NaF, and nano Ni powders as raw materials. The study examined the effects of the ratios of these raw materials, reaction temperature, and reaction time on the phase composition and microstructure of the TaC whiskers, as well as their growth mechanisms. The results indicated that production and length-diameter ratio of the TaC whiskers initially increased with higher carbon content until a certain point, after which they began to decrease. The prepared TaC whiskers using NaCl as molten salt were acicular and had a low length-diameter ratio. The TaC whiskers prepared by NaF were quadrangular prism-shaped and had a high ratio of length to diameter. Insufficient molten salt resulted in poor diffusion and uneven distribution of the reactants, while an excessive amount led to increased whisker diameters and agglomeration of the TaC whiskers. When the content of Ni was low, there were not enough nucleation points for whisker growth, resulting in only a small quantity of TaC whiskers. Conversely, a high Ni concentration caused a decrease in the length-to-diameter ratio of the whiskers. As reaction temperature rose, both the production and length-diameter ratio of the TaC whiskers first rose and then fell. Prolonging reaction time could increase production and length-diameter ratio of the TaC whiskers. When the molar ratio of Ta:C:F:Ni was 1:4:1:25:0.10, with a reaction temperature of 1300 °C and a reaction time of 2 h, the TaC whiskers exhibited the highest production, purity and length-to-diameter ratio. These whiskers had with an average diameter of 0.8 μm and lengths spanning several microns. The TaC whiskers had a single crystal structure, with their growth direction aligned along the [001] crystal direction. The growth mechanisms of the TaC whiskers were controlled by both the vapor-liquid-solid and solid-liquid-solid mechanisms.
研究领域:
材料科学
·
晶体生长
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Lang Pei,Yingqiang Yu,Zhanfeng Ma,Xusheng Wang,Qinan Mao,Jiasong Zhong
Sr2MgSi2O7/Eu2+, Dy3+ (SMSED) phosphors show promise for persistent luminescence applications due to their long afterglow and robust chemical stability. However, a trade-off exists between achieving precise size and shape control of SMSED and maintaining prolonged afterglow intensity and duration during synthesis. Herein, we unveil a molten-salt method that successfully produces uniform single-crystalline plate-like SMSED for the first time. This synthesis significantly reduces both the sintering temperature and time compared to the classic solid–state reaction (SSR) method. Owing to the nanoplates structure, uniform size distribution, and single-crystal nature, the resulting SMSED exhibited excellent afterglow performance and thermal stability, with a sustained blue afterglow exceeding 24 h and retaining >70% of its initial luminescence up to 523 K, outperforming most reported SMSED phosphors. These remarkable properties underscore the considerable potential of SMSED nanoplates for applications in fingerprint detection. This work unlocks a new synthetic frontier for achieving the controllable synthesis of SMSED phosphors, paving the way for future optimizations aimed at the development of advanced persistent luminescent phosphors.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
·
IF 4.217
Ting Chen,Xiaojun Zhang,Weihui Jiang,Zhixiang Xie,Yanqiao Xu,Huidong Tang,Wan Jiang
A core-shell structure zirconium silicate encapsulated carbon (C@ZrSiO 4 ) pigment was synthesized by a molten-salt assisted method. The experimental results indicated that the Na 2 WO 4 molten-salt associated with the synthesis of ZrSiO 4 at low temperature and controlled the morphology of the encapsulation pigment simultaneously. The encapsulated pigment prepared with the assistance of Na 2 WO 4 molten-salt showed regular microcubes about 3.0 μm, while the pigment in the absence of molten-salt have serious aggregation with a particle size of 12.78 μm. Moreover, the maximum addition amount of carbon black was increased significantly from 15 wt% to 40 wt% after adding molten-salt, while the chromatic value L * of C@ZrSiO 4 pigment decreased from 68.21 to 33.08 accordingly. The pigment exhibited excellent thermal stability at high temperature, making it a promising candidate for ceramic decoration.
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
JOURNAL OF LUMINESCENCE
·
2013
·
IF 2.144
Ying Ji,Xiaoyang Liu,Benxian Li,Jingchao Zhang,Xiaofeng Wang
Mild molten salt synthesis (MSS) method was utilized to synthesize rare earth fluorides nanocrystals with favorable fluorescence efficiency. LaF 3 nanocrystals were achieved through this modified MSS method by only using La(NO 3 ) 3 ·6H 2 O and NH 4 HF 2 as starting materials. NH 4 HF 2 is difunctionality as both fluorine source and the flux. The effects of reaction time and temperature to the synthesis of LaF 3 nanocrystals were discussed in detail. The fluorescence of LaF 3 nanocrystals was detected with excitation wavelength of 360 nm, the results showed a broad band emission centered at 475 nm. The photoluminescence properties of pure LaF 3 nanocrystals and Eu 3+ doped samples were also investigated. In our work, white light emission was achieved in single element (Eu 3+ ) doped LaF 3 nanocrystals by adjusting the concentration of Eu 3+ ions. This would be the combination of broad emission of LaF 3 nanocrystals and sharp line emission of Eu 3+ in the LaF 3 :Eu 3+ nanocrystals.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Yujing Ou,Junqing Shi,Quanqing Yan,Chunlei Li,Yi Zheng
Molten salt synthesis is an efficient method for preparation of photocatalyst. Enhancing precursor mixing effect is important. In this study, we found ethanol is important for synthsis of face-to-face type Bi 4 Ti 3 O 12 /Bi 2 Ti 2 O 7 composite photocatalyst. The prepared Bi 4 Ti 3 O 12 /Bi 2 Ti 2 O 7 (B3) composite under molar ratio of Bi:Ti of 4:3.6 displays higher photocatalytic activity compared with Bi 4 Ti 3 O 12 (B1) and Bi 2 Ti 2 O 7 (B4). The photocurrent density of B3 is 2 times higher than B1 and 1.6 times higher than B4, and B3 has smallest charge resistance between sample and solution. Combined with XPS, the study found that the higher photocatalytic activity origins from large charge transfer interface and built-in electric field (BIEF) around such interface, rathor than light absorption and dark adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2022
·Vol. 53
·期 1
·617-626
·
IF 2.872
Fu Yingzheng,Zhang Zhimin,Lu Xuchen,Pan Binfeng,Zhang Lipeng
A new approach that was designed to prepare Mg–Nd binary alloys via molten-salt-mediated magnesiothermic reduction by using Nd 2 O 3 and Mg metal as raw materials was presented. The overall approach was based on a chemical pathway that synergistically integrated a series of simple steps to produce Mg–Nd alloys that could meet the requirement of Nd content in commercial Nd-containing magnesium alloys. The key steps included preparation of NdCl 3 -containing molten salt, the reduction of NdCl 3 by Mg in molten salt, and the removal of MgCl 2 from molten salt. The results showed that this approach could indeed prepare Mg–(6 to 18) weight percent Nd binary alloys, and the remaining molten salt could be recycled after being treated with NdF 3 . When other parameters were fixed, the Nd content in alloy could be adjusted only by adjusting the concentration of NdCl 3 and MgCl 2 in molten salt. Besides, a decrease in temperature or an increase in the mass ratio of molten salt to Mg could further increase the Nd content in alloy when other conditions were fixed.
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 THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 12
·6901-6912
·
IF 3.502
Qiyun Wu,Chenxing Liao,Jinquan Pan,Xinyu Ye,Weixiong You,Libin Xia
It has been one of the hot issues to prepare the red-emitting Mn 4+ -doped fluoride phosphors with highly efficient and waterproofness for warm white-light-emitting diodes (WLEDs) by the green and environmentally friendly method. Herein, we design a novel green molten salt route to synthesize K 2 SiF 6 :Mn 4+ red powder using molten NH 4 HF 2 salt instead of HF liquor as the reaction medium. The results show that KMnO 4 and MnF 2 could produce Mn 4+ in NH 4 HF 2 molten salt through a reduction reaction, and the resulting Mn 4+ -doped K 2 SiF 6 exhibited a bright red emission peaked at 632 nm under blue light excitation. The luminescence intensity of the as-obtained product after immersing into water for 24 hours maintain nearly 100% of that before soaking and emission peak shape remains unchanged. The thermal stability of the sample was evaluated by temperature-dependent luminescence spectral intensity during heating and cooling. Furthermore, a warm white-light-emitting diodes (WLEDs) with an excellent color rendering index (Ra = 87.1), lower correlated color temperature (CCT = 3536K), and high luminous efficacy (116.99 lm·W −1 ) was fabricated based on blue chip and K 2 SiF 6 :Mn 4+ and commercial yellow phosphor (Y 3 Al 5 O 12 :Ce 3+ ).
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 24
·11967-11974
·
IF 6.97
Chan Wang,Yueyue Chen,Tantan Hu,Yong Chang,Guoxia Ran,Mei Wang,Qijun Song
A molten salt (MS) method is designed for the preparation of carbon dot-based room temperature phosphorescent (RTP) materials. Carbon dots (CDs) are in situ formed and confined in inorganic salts during the recrystallization process. The composite materials CDs@MS and their RTP were characterized by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and low temperature (77 K) fluorescence and phosphorescence spectroscopy. The as-prepared CDs@MS exhibits long lifetime RTP (up to 886 ms) and excitation dependent phosphorescence, i.e., the emission can be facilely tuned from 510 nm to 573 nm (green to yellow color) by changing the excitation wavelength. The RTP phenomenon is ascribed to the fact that the crystallization of molten salts forms a rigid structure, which preserves the triplet state of CDs and suppresses the nonradiative transition. It was found that the high charge density of metal ions plays a critical role in reducing the energy gap for realizing effective intersystem crossing. CD-based RTP materials with yellow phosphorescent emission are achieved from a variety of carbon sources and a gram-scale synthetic method. The excitation dependent RTP feature of CDs@MS nanocomposites could provide a novel dual security protection strategy in high-level information anticounterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 2
·1459-1471
·
IF 3.784
Shengtai Zhang,Baoliang Xu,Jingkai Cheng,Shilin Luo,Yi Ding,Shiyin Ji,Tao Duan,Jianjun Ma,Cairong Jiang
Molten salt provides a fast mass transfer and nucleation process, so the ceramic solid solution for immobilization of high-level nuclear waste (HLW) can be synthesized at lower temperatures. The chemical stability in the process of interaction with groundwater determines the ability of the matrix phase to prevent radionuclides from entering the biosphere. Nd-doped Y 3 Fe 5 O 12 ceramics were prepared by the molten salt method at different sintering temperatures (1000℃, 1100℃, 1200℃) and different m (eutectic salt): m (oxide) ratios (2:1, 3:1, 4:1). The sintered ceramic is Y 3-x Nd x Fe 5 O 12 , where x is the solubility of Nd in YIG. The results show that the optimum mass ratio of molten salt to oxide is 3:1. The solubility of Nd in garnet is 33.3 mol% ( x = 1.1) and 56.7 mol% ( x = 1.6) at 1100℃ and 1200℃, respectively. In the neutral medium, Nd does not transfer to the liquid phase. Acid leaching promotes the strong dissolution of the garnet matrix. In this case, the leaching rate of Nd from ceramics to the liquid phase is two to three orders of magnitude higher than that in a neutral medium. The experimental results suggest that garnet matrices can reliably immobilize actinides in subsurface repositories.
研究领域:
材料科学
·
核废料管理
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）