scholarly journals Microstructure and Morphology Control of Potassium Magnesium Titanates and Sodium Iron Titanates by Molten Salt Synthesis

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1577 ◽  
Author(s):  
Haoran Zhang ◽  
Mengshuo Li ◽  
Ze Zhou ◽  
Liming Shen ◽  
Ningzhong Bao
Keyword(s):  
Molten Salt ◽  
High Performance ◽  
Large Scale ◽  
Raw Materials ◽  
Synthesis Method ◽  
Molten Salt Synthesis ◽  
Molar Ratio ◽  
Molten Salt Method ◽  
Experimental Conditions ◽  
Potassium Magnesium

Titanates materials have attracted considerable interest due to their unusual functional and structural properties for many applications such as high-performance composites, devices, etc. Thus, the development of a large-scale synthesis method for preparing high-quality titanates at a low cost is desired. In this study, a series of quaternary titanates including K0.8Mg0.4Ti1.6O4, Na0.9Mg0.45Ti1.55O4, Na0.75Fe0.75Ti0.25O2, NaFeTiO4, and K2.3Fe2.3Ti5.7O16 are synthesized by a simple molten salt method using inexpensive salts of KCl and NaCl. The starting materials, intermediate products, final products, and their transformations were studied by using TG-DSC, XRD, SEM, and EDS. The results show that the grain size, morphology, and chemical composition of the synthesized quaternary titanates can be controlled simply by varying the experimental conditions. The molar ratio of mixed molten salts is critical to the morphology of products. When KCl:NaCl = 3:1, the morphology of K0.8Mg0.4Ti1.6O4 changes from platelet to board and then bar-like by increasing the molar ratio of molten salt (KCl–NaCl) to raw materials from 0.7 to 2.5. NaFeTiO4 needles and Na0.75Fe0.75Ti0.25O2 platelets are obtained when the molar ratio of molten salt (NaCl) to raw materials is 4. Pure phase of Na0.9Mg0.45Ti1.55O4 and K2.3Fe2.3Ti5.7O16 are also observed. The formation and growth mechanisms of both potassium magnesium titanates and sodium iron titanates are discussed based on the characterization results.

Synthesis and Reaction Mechanism of Ti3SiC2 by Molten Salt Method from Ti-Si-Fe Alloy

2018 ◽  
Vol 768 ◽  
pp. 159-166 ◽  
Author(s):  
Jin Hua Zhang ◽  
Si Xiong ◽  
Chang Ming Ke ◽  
Hong Dan Wu ◽  
Xin Rong Lei
Keyword(s):  
Electron Microscope ◽  
Molten Salt ◽  
Raw Materials ◽  
Synthesis Method ◽  
Molten Salt Synthesis ◽  
Synthesis Process ◽  
Molten Salt Method ◽  
Synthetic Temperature ◽  
Chloride Salts ◽  
Titanium Silicon

Titanium silicon carbide (Ti3SiC2) were obtained by molten salt synthesis method using the Ti-Si-Fe alloy extracted from high titania blast furnace slag and natural graphite as the raw materials. The phase composition, microscopic structure of the products were characterized by powder X-ray diffraction, scanning electron microscope and transmission electron microscope. The influence of firing temperature and chloride salts species on the phase and morphology of the products were investigated. The results indicated that the synthetic temperature of Ti3SiC2 by molten salt synthesis method was about 100 °C, which was lower than that without molten salts. The “dissolution-precipitation” mechanism governed the overall molten salt synthesis process. The lamellar Ti3(Si,Al)C2 crystal growth obeyed by a two-dimensional ledge growth mechanism.

scholarly journals Molten Salt Synthesis of High-Performance, Nanostructured La0.6Sr0.4FeO3−δ Oxygen Electrode of a Reversible Solid Oxide Cell

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2267
Author(s):  
Xiaodong Zuo ◽  
Zhiyi Chen ◽  
Chengzhi Guan ◽  
Kongfa Chen ◽  
Sanzhao Song ◽  
...  
Keyword(s):  
Molten Salt ◽  
High Performance ◽  
Reaction Medium ◽  
Solid Oxide ◽  
Molten Salt Synthesis ◽  
Electrolysis Cell ◽  
Molten Salt Method ◽  
Assembly Method ◽  
Oxygen Electrodes ◽  
Direct Assembly

Nanoscale perovskite oxides with enhanced electrocatalytic activities have been widely used as oxygen electrodes of reversible solid oxide cells (RSOC). Here, La0.6Sr0.4FeO3−δ (LSF) nanoscale powder is synthesized via a novel molten salt method using chlorides as the reaction medium and fired at 850 °C for 5 h after removing the additives. A direct assembly method is employed to fabricate the LSF electrode without a pre-sintering process at high temperature. The microstructure characterization ensures that the direct assembly process will not damage the porosity of LSF. When operating as a solid oxide fuel cell (SOFC), the LSF cell exhibits a peak power density of 1.36, 1.07 and 0.7 W/cm2 at 800, 750 and 700 °C, respectively, while in solid oxide electrolysis cell (SOEC) mode, the electrolysis current density reaches 1.52, 0.98 and 0.53 A/cm2 under an electrolysis voltage of 1.3 V, respectively. Thus, it indicates that the molten salt routine is a promising method for the synthesis of highly active perovskite LSF powders for directly assembled oxygen electrodes of RSOC.

Application of Molten Salt Method in Hercynite Composite Powder Synthesis at Elevated Temperature

2017 ◽  
Vol 726 ◽  
pp. 460-464 ◽  
Author(s):  
Yan Chai ◽  
Mei Jie Zhang
Keyword(s):  
Molten Salt ◽  
Iron Powder ◽  
Synthesis Method ◽  
Reaction Medium ◽  
Raw Material ◽  
Molten Salt Synthesis ◽  
Alumina Powder ◽  
Molten Salt Method ◽  
Powder Synthesis ◽  
Powder Content

With molten salt method, a series of the hercynite powders were prepared using FeCl2·4H2O, active alumina and iron powder as raw material and KCl molten salt as reaction medium. The phase composition and micro-morphology were studied by techniques of XRD and SEM. The results showed that a high purity hercynite-alumina powder can be synthesized by molten salt synthesis method after heat treatment at 1000 °C in reducing atmosphere, the main phases were hercynite and α-Al2O3, and the increasing iron powder content can raise hercynite production quantity with developed crystal grain, the grain size was increased from 6μm to 10μm.

Molten Salt Synthesis of Strontium-Doped Lanthanum Manganite Nanoparticles with Enhanced Catalytic Performance for Toluene Combustion

NANO ◽  
2016 ◽  
Vol 11 (05) ◽  
pp. 1650059 ◽  
Author(s):  
Yingliang Tian ◽  
Wencai Liu ◽  
Yongqiang Lu ◽  
Shibing Sun
Keyword(s):  
Molten Salt ◽  
Catalytic Performance ◽  
Lanthanum Manganite ◽  
Molten Salt Synthesis ◽  
Molar Ratio ◽  
Partial Substitution ◽  
Molten Salt Method ◽  
Promoting Effect ◽  
Manganite Nanoparticles ◽  
One Step

La[Formula: see text]SrxMnO[Formula: see text] (LSMO) and LaMnO[Formula: see text] (LMO) nanoparticle catalysts have been synthesized via a one-step molten salt route. It was found that the partial substitution of lanthanum by strontium had a promoting effect on the catalytic performance for toluene oxidation. Under the condition of toluene [Formula: see text][Formula: see text]ppm, toluene/O2[Formula: see text] and the space [Formula: see text][Formula: see text]mL/(g h), the temperature required for 50% and 90% toluene combustion conversion was 150[Formula: see text]C and 205[Formula: see text]C over LSMO catalyst, respectively. It is concluded that the oxygen vacancy, the molar ratio Mn[Formula: see text]/Mn[Formula: see text] on the surface and the specific surface area contribute to the improved catalytic performance of the LSMO nanoparticle materials via a one-step molten salt method.

MOLTEN SALT SYNTHESIS OF YF3:Yb3+/Ln3+(Ln = Er3+, Tm3+) MICROSHEETS WITH MULTICOLOR UPCONVERSION LUMINESCENCE

2013 ◽  
Vol 06 (06) ◽  
pp. 1350061 ◽  
Author(s):  
MINGYE DING ◽  
CHUNHUA LU ◽  
LINHAI CAO ◽  
YARU NI ◽  
ZHONGZI XU
Keyword(s):  
Molten Salt ◽  
Laser Diode ◽  
Upconversion Luminescence ◽  
Emission Spectra ◽  
Upconversion Emission ◽  
Molten Salt Synthesis ◽  
Molten Salt Method ◽  
Orthorhombic System ◽  
Co Doping ◽  
First Time

In this paper, highly crystalline YF 3: Yb 3+/ Ln 3+( Ln = Er 3+, Tm 3+) microsheets were successfully synthesized by a surfactant-free molten salt method for the first time. The results indicated that the as-obtained samples belonged to orthorhombic system and exhibited microsheets morphology with side lengths of 30 to 80 μm and wall thickness from 1 to 1.5 μm. By changing the dopant's species ( Ln 3+), multicolor (yellow and blue) upconversion emission can be observed in YF 3: Yb 3+/ Ln 3+ microsheets under 980 nm laser diode (LD) excitation. The upconversion mechanisms in co-doping YF 3 samples were analyzed in detail based on the emission spectra. Importantly, this approach not only proposes a new alternative in synthesizing such materials, but also opens the possibility to meet the increasing commercial demand.

scholarly journals Large-scale preparation of black phosphorus by molten salt method for energy storage

ChemPhysMater ◽  
2021 ◽  
Author(s):  
Shaojie Zhang ◽  
Zili Qin ◽  
Zhiguo Hou ◽  
Jiajia Ye ◽  
Zhibin Xu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Molten Salt ◽  
Large Scale ◽  
Black Phosphorus ◽  
Molten Salt Method ◽  
Large Scale Preparation ◽  
Scale Preparation

scholarly journals Microwave-Assisted Molten-Salt Facile Synthesis of Chromium Carbide (Cr3C2) Coatings on the Diamond Particles

2019 ◽  
Vol 38 (2019) ◽  
pp. 370-379 ◽  
Author(s):  
Lei Xu ◽  
Chenlong Wei ◽  
Wei Li ◽  
Libo Zhang ◽  
Jinhui Peng
Keyword(s):  
Molten Salt ◽  
Chromium Carbide ◽  
Coating Thickness ◽  
Raw Materials ◽  
Heating Temperature ◽  
Molten Salt Synthesis ◽  
Positive Role ◽  
Temperature Range ◽  
Microwave Assisted ◽  
Diamond Particles

AbstractChromium carbide (Cr3C2) coatings on the diamond were fabricated using the mixtures of molten salt of NaCl and BaCl2, powders of metallic chromium and diamond as raw materials in the temperature range of 750–900 °C by the microwave-assisted molten-salt synthesis. The morphology, microstructure and phase composition of the surface layer were characterized by Scanning Electron Microscopy, Energy-dispersive Spectrometry and X-ray diffraction. The results show that the surface of the diamond particles could be coated with Cr, forming a uniform and continuous Cr3C2-coated layer. The coatings thickness on the diamond can be controlled by adjusting the heating temperature and time. The coating thickness expanded from 0.73 to 2.30 µm when the temperature was increased from 750 °C to 900 °C, and increasing rapidly during the temperature range of 800  °C–850  °C, the coating thickness expanded from 1.30 to 2.80 µm when the holding time was increased from 0.5 h to 4 h. The results illustrate that the microwave-assisted molten salt synthesis plays a positive role in chromium coatings on the diamond, offering a potent method for the surface metallization of diamond.

scholarly journals Facile molten salt synthesis of Cs–MnO2 hollow microflowers for supercapacitor applications

RSC Advances ◽  
2019 ◽  
Vol 9 (33) ◽  
pp. 19079-19085 ◽  
Author(s):  
Praeploy Chomkhuntod ◽  
Arreerat Jiamprasertboon ◽  
Anurak Waehayee ◽  
Teera Butburee ◽  
Narong Chanlek ◽  
...  
Keyword(s):  
Molten Salt ◽  
Molten Salt Synthesis ◽  
Molten Salt Method ◽  
Supercapacitor Applications

Hollow microflowers of Cs intercalated MnO2 binessite are prepared by a facile molten salt method and tested for supercapacitor electrodes.

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