scholarly journals Molten salt synthesis of TiB2 nanopowder by reduction of TiO2 with MgB2

2021 ◽  
Vol 15 (1) ◽  
pp. 40-46
Author(s):  
Liaqat Shah
Keyword(s):  
Molten Salt ◽  
Research Work ◽  
Molten Salt Synthesis ◽  
Average Particle ◽  
Particle Sizes ◽  
High Concentration ◽  
Active Materials ◽  
Surface Areas ◽  
Salt Mass ◽  
Mass Ratios

This research work presents the preparation of TiB2 nanopowders by molten-salt synthesis (MSS) technique from TiO2 and MgB2 as starting active materials and MgCl2 as a molten salt. The pure TiB2 nanopowders were finally prepared using 2M HCl aqueous solution to leach the synthesized samples. The effects of the firing temperature, firing time and reactants to salt ratio on the TiB2 nanopowders formation were examined. The results demonstrated that the TiB2 formation was completed even with reactants to salt mass ratio of 1:2 at 1000 ?C for 4 h. The TiB2 nanopowders synthesized with 1:2, 1:5 and 1:10 reactants to salt mass ratios have different particle sizes. Thus, the average particle sizes estimated from BET surface areas were 59, 55 and 46 nm for the samples synthesized with 1:2, 1:5 and 1:10 reactants to salts mass ratios, respectively. These results illustrated that the high concentration of MgCl2 plays a key role in the particles? size reduction. The above results assured that this research study presents a new low-temperature synthesis route for nano-sized metal diboride powders.

Molten Salt Synthesis of CaCu3Ti4O12

2008 ◽  
Vol 368-372 ◽  
pp. 115-117 ◽  
Author(s):  
Ke Pi Chen ◽  
Yong He ◽  
Dong Yu Liu ◽  
Zong De Liu
Keyword(s):  
Particle Size ◽  
Molten Salt ◽  
Average Particle Size ◽  
Particle Morphology ◽  
Holding Time ◽  
Molten Salt Synthesis ◽  
Average Particle ◽  
Molten Salt Method ◽  
Particle Size Analyzer ◽  
Size And Morphology

CCTO powders were prepared by using molten salt method in the NaCl-KCl system. The effects of temperature and holding time on phase compositions, particle morphology and size have been investigated by X-ray diffraction, scanning electron microscope and laser particle size analyzer. Using CaCO3, CuO and TiO2 as starting materials, CCTO compound could be synthesized at any temperature from 800oC to 1000oC in the NaCl-KCl system. The average particle size increased obviously with the increasing of temperature above 850 oC. Holding time had great effect on grain size and morphology.

Molten Salt Synthesis of Anisotropy BaBi4Ti4O15 Powders in K2SO4-Na2SO4 Flux

2011 ◽  
Vol 687 ◽  
pp. 333-338 ◽  
Author(s):  
Yong Jun Gu ◽  
Jin Liang Huang ◽  
Li Hua Li ◽  
Ke Zhang ◽  
Xiao Wang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Particle Size ◽  
Molten Salt ◽  
Process Parameters ◽  
Average Particle Size ◽  
Particle Growth ◽  
Molten Salt Synthesis ◽  
Average Particle ◽  
Synthesis Conditions ◽  
Arrhenius Dependence

Anisotropic BaBi4Ti4O15 powder was synthesized by a molten salt synthesis (MSS) method in K2SO4-Na2SO4flux and the effects of different process parameters such as calcining temperature, and ratio of salt to reactant (R) on the phase formation and morphology of anisotropic BaBi4Ti4O15particles were also investigated. The as-synthesized powder calcined at 850-950°C exhibits a single tetragonal BaBi4Ti4O15phase. The morphology of BaBi4Ti4O15powder could be adjusted by changing the synthesis conditions. The average particle size (APS) of BaBi4Ti4O15powder increased with R changing from 0.8 to 1.0, while it decreased with further increasing of R to 1.2. In addition, the APS increased with increasing calcining temperature and it showed an Arrhenius dependence on the temperature. The corresponding apparent activation energy for particle growth is 31.9kJ/mol for calcining temperature of 850-1000°C.

Influences of Progressing Parameters on Flake BaBi4Ti4O15 Powder Synthesized by Molten Salt Synthesis Method

2011 ◽  
Vol 335-336 ◽  
pp. 704-707 ◽  
Author(s):  
Jin Liang Huang ◽  
Li Hua Li ◽  
Yong Jun Gu ◽  
Qian Li
Keyword(s):  
Molten Salt ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Molten Salt Synthesis ◽  
Average Particle ◽  
Reaction Products ◽  
X Ray Diffraction ◽  
Chloride Flux ◽  
X Ray ◽  
Sulfate Flux

Abstract. BaBi4Ti4O15 powder was synthesized by molten salt synthesis (MSS) method in NaCl-KCl and Na2SO4-K2SO4 fluxes. The phases of reaction products and the microstructures at different calcined temperatures were detected by X-ray diffraction (XRD) and scanning electron microscope (SEM). As a result, the flaky BaBi4Ti4O15 powder with anisotropy was synthesized by molten salt synthesis method in NaCl-KCl and Na2SO4-K2SO4 fluxes in the range of 850～1050°C. Compared with BaBi4Ti4O15 powder synthesized in the sulfate flux, the anisotropy level of BaBi4Ti4O15 powder which was synthesized in chloride flux increased, the average particle size(APS) of BaBi4Ti4O15 powder synthesized in the chloride flux is slight larger than in the sulfate flux. The thickness of BaBi4Ti4O15 powder was synthesized by molten salt synthesis method in the chloride flux decreased than in the sulfate.

scholarly journals Luminescent Properties of Y2O3:Eu3+Nanocrystals Prepared by Molten Salt Synthesis

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Lijun Luo ◽  
Fenfen Hu ◽  
Li Xiong ◽  
Xiaofan Li ◽  
Meili Zhou ◽  
...  
Keyword(s):  
Molten Salt ◽  
Room Temperature ◽  
Red Light ◽  
Average Particle Size ◽  
Luminescent Properties ◽  
Molten Salt Synthesis ◽  
Average Particle ◽  
Molten Salt Method ◽  
Red Phosphor ◽  
Red Phosphors

A series of red phosphors Y2O3:Eu3+were prepared by the molten salt method with different surfactants. Their structures, morphologies, and the photoluminescent properties were investigated at room temperature. The particles size of Y2O3:Eu3+can be controlled by adjusting the kinds of surfactants. The phosphor Y2O3:Eu3+prepared with NP-10 [polyoxyethylene (10) nonyl phenyl ether] shows regular morphology and higher crystallinity, and its average particle size is about 200 nm. Bright red light can be observed by naked eyes from the red phosphor under 254 nm excitation.

Synthesis, Characterization and Sintering Behavior of Nanocrystalline Cordierite Ceramics

2006 ◽  
Vol 45 ◽  
pp. 242-247 ◽  
Author(s):  
Paveena Laokul ◽  
S. Maensiri
Keyword(s):  
Specific Surface ◽  
Calcination Temperature ◽  
Sintering Behavior ◽  
Complex Method ◽  
Second Phase ◽  
Average Particle ◽  
Particle Sizes ◽  
Surface Areas ◽  
Selected Area Electron Diffraction ◽  
Cordierite Ceramics

Nanocrystalline cordierite powders were prepared by the polymerized complex method. The synthesized precursor was calcined in air at 600-1200 oC for 1h, and the calcined powders were fully characterized by TG/DTA, BET, XRD, SEM, and TEM. The XRD and selected-area electron diffraction (SAED) analysis confirmed the development of the phase composition of cordierite powders showing amorphous phase after calcination at temperature below 800oC, mixed phases of spinel and μ-cordierite phase after calcination at 800oC and 900oC, and mixed phases of spinel, μ- cordierite and α-cordierite phases after calcination at above 900oC. The BET specific surface areas of the calcined powders varied from 3 to 107 m2/g, depending on calcination temperature. The highest specific surface area of 107 m2/g was found in the powders calcined at 800oC. The average particle sizes evaluated by BET were less than 60 nm, depending on calcination temperature. The powders calcined at 800oC and 1000oC were uniaxially pressed and pressureless-sintered in air at 1250-1350oC for 2h. Densities of the sintered samples evaluated by Archimedes’s method were 87- 91 % of theoretical value. The crystal structure of all the sintered samples, determined by XRD, was mainly α-cordierite, having a small amount of spinel as second phase.

scholarly journals Facile Hydrothermal and Solvothermal Synthesis and Characterization of Nitrogen-Doped Carbon Dots from Palm Kernel Shell Precursor

2021 ◽  
Vol 11 (4) ◽  
pp. 1630
Author(s):  
Yakubu Newman Monday ◽  
Jaafar Abdullah ◽  
Nor Azah Yusof ◽  
Suraya Abdul Rashid ◽  
Rafidah Hanim Shueb
Keyword(s):  
Carbon Dots ◽  
Batch Reactor ◽  
Average Particle Size ◽  
Research Work ◽  
Palm Kernel ◽  
Average Particle ◽  
One Pot ◽  
Palm Kernel Shell ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Carbon dots (CDs), a nanomaterial synthesized from organic precursors rich in carbon content with excellent fluorescent property, are in high demand for many purposes, including sensing and biosensing applications. This research focused on preparing CDs from natural and abundant waste, palm kernel shells (PKS) obtained from palm oil biomass, aiming for sensing and biosensing applications. Ethylenediamine and L-phenylalanine doped CDs were produced via the hydrothermal and solvothermal methods using one-pot synthesis techniques in an autoclave batch reactor. The as-prepared N-CDs shows excellent photoluminescence (PL) property and a quantum yield (QY) of 13.7% for ethylenediamine (EDA) doped N-CDs (CDs-EDA) and 8.6% for L-phenylalanine (L-Ph) doped N-CDs (CDs-LPh) with an excitation/emission wavelength of 360 nm/450 nm. The transmission electron microscopy (TEM) images show the N-CDs have an average particle size of 2 nm for both CDs. UV-Visible spectrophotometric results showed C=C and C=O transition. FTIR results show and confirm the presence of functional groups, such as -OH, -C=O, -NH2 on the N-CDs, and the X-ray diffraction pattern showed that the N-CDs were crystalline, depicted with sharp peaks. This research work demonstrated that palm kernel shell biomass often thrown away as waste can produce CDs with excellent physicochemical properties.

Molten Salt Synthesis and Luminescent Properties of YVO4:Ln (Ln = Eu3+, Dy3+) Nanophosphors

2012 ◽  
Vol 12 (1) ◽  
pp. 151-158 ◽  
Author(s):  
Chenglu Liu ◽  
Fang Wang ◽  
Peiyun Jia ◽  
Jun Lin ◽  
Zhiqiang Zhou
Keyword(s):  
Molten Salt ◽  
Luminescent Properties ◽  
Molten Salt Synthesis

Nd/V Co-Doped Bi4Ti3O12Powder Prepared By Molten Salt Synthesis

2007 ◽  
Vol 90 (10) ◽  
pp. 3353-3356 ◽  
Author(s):  
Qing-Yuan Tang ◽  
Yan-Mei Kan ◽  
Pei-Ling Wang ◽  
Yao-Gang Li ◽  
Guo-Jun Zhang
Keyword(s):  
Molten Salt ◽  
Molten Salt Synthesis ◽  
Co Doped

Molten salt synthesis of LiMn2O4 using chloride–carbonate melt

2010 ◽  
Vol 124 (1) ◽  
pp. 439-442 ◽  
Author(s):  
M. Helan ◽  
L. John Berchmans ◽  
Timy P. Jose ◽  
A.Visuvasam ◽  
S. Angappan
Keyword(s):  
Molten Salt ◽  
Molten Salt Synthesis ◽  
Carbonate Melt
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