scholarly journals Studies on Highly Dense Pure YIG Polycrystalline Ceramics Fabricated by Tape-casting Method

2020 ◽  
Author(s):  
Chong Zhao ◽  
Yingkui Li ◽  
Xiaofei Shen ◽  
Zhijun Cao ◽  
Zhiquan Cao ◽  
...  
Keyword(s):  
Tape Casting ◽  
Solid State Reaction Method ◽  
Grain Structure ◽  
Casting Method ◽  
Forming Process ◽  
Sem Images ◽  
Polycrystalline Ceramics ◽  
Pure Phase ◽  
One Step ◽  
Xrd Patterns

Abstract Pure phase Y3Fe5O12 (YIG) ceramics was successfully produced by tape-casting forming process and one-step solid-state reaction method. With the sintering temperature above 1100 ºC, the pure phase YIG ceramics was synthesized with no YIP or Fe2O3 phase in XRD patterns. YIG ceramic sintering at 1400 ºC for 10 h showed a clear grain structure with an obvious grain boundary, and no pores were observed in the SEM images. YIG ceramics in this paper has a high relative density which was 99.8% and the saturation magnetization was 28.2 emu/g at room temperature. The hysteresis loss at temperatures of 230-360 K was smaller than 10 mJ/kg. The tan Se was nearly zero at 6~7 GHz and 11~12 GHz, showing that it can be used as a good material for microwave applications. In addition, the low values of tan and tan indicates that it may have a good electromagnetic wave absorption ability.

Synthesis and Characterization of Sm1-xZrxFe1-yMgyO3 (x, y = 0.5, 0.7, 0.9) as Possible Electrolytes for SOFCs

2018 ◽  
Vol 765 ◽  
pp. 49-53 ◽  
Author(s):  
Abdalla Mohammed Abdalla ◽  
Shahzad Hossain ◽  
Nikdalila Radenahmad ◽  
Pg Mohammad Iskandar Petra ◽  
Mahendra Rao Somalu ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Rietveld Refinement ◽  
Electrochemical Impedance ◽  
Bragg Reflection ◽  
Solid State Reaction Method ◽  
Perovskite Oxide ◽  
Molar Ratio ◽  
Sem Images ◽  
Ionic Size ◽  
Xrd Patterns

The novel perovskite oxide series of Sm1-xZrxFe1-yMgyO3 (x,y = 0.5, 0.7, 0.9) were synthesized by solid state reaction method. X-ray diffraction (XRD), Rietveld refinement, scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and conductivity analysis were carried out. XRD patterns of sintered materials revealed the shifted Bragg reflection to higher angle for the higher content of Zr and Mg. This is related to the ionic size of the dopant elements. Rietveld refinement showed that all compounds crystallized in cubic space group of Fm-3m. SEM images showed that the grains were well defined with highly dense surfaces makes it potential as an electrolyte material in solid oxide fuel cells (SOFCs) or gases sensors. Impedance spectroscopy at 550-800 °C shows that conductivity is higher at higher temperature. Sm0.5Zr0.5Fe0.5Mg0.5O3 shows the highest conductivity of 5.451 × 10-3 S cm-1 at 800 °C. It was observed that 50% molar ratio of Mg and Zr doping performed highest conductivity.

scholarly journals Effect of solid content variations on PZT slip for tape casting

2012 ◽  
Vol 6 (4) ◽  
pp. 215-221 ◽  
Author(s):  
Gang Jian ◽  
Hu Qingxian ◽  
Lu Sheng ◽  
Dongxiang Zhou ◽  
Fu Qiuyun
Keyword(s):  
Lead Zirconate Titanate ◽  
Ferroelectric Properties ◽  
Tape Casting ◽  
Solid State Reaction Method ◽  
Lead Zirconate ◽  
Solid Content ◽  
Structure And Properties ◽  
Casting Method ◽  
Zeta Potentials ◽  
Ceramic Films

Lead zirconate titanate (PZT) particles with pure tetragonal structure were synthesized by solid-state reaction method and used for preparation of slurries with different solid contents (34-80 wt.%). Then, PZT thick films were fabricated by the nonaqueous tape casting method. It was shown that the slurry prepared from ball-milled particles exhibited better rheology properties than slurry from particles which were not ball-milled. Measurement of sedimentation volumes and zeta potentials indicated particle aggregation, resulting in weak stability of the slurries with high solid contents. The microstructure, piezoelectric and ferroelectric properties of PZT sintered films were investigated in terms of solid contents. Ceramic films prepared from the slurry with solid contents of 73 wt.% had the optimal structure and properties. After poling at 200 ?C with an applied field of 1.2 kV/cm, a d33 of 294 pC/N was achieved; typical ferroelectric properties were also observed with a Ps of 38 ?C/cm2.

Fabrication of 0.6(Bi0.85La0.15)FeO3-0.4PbTiO3 Multiferroic Ceramics by Tape Casting Method

2013 ◽  
Vol 1547 ◽  
pp. 61-66 ◽  
Author(s):  
Guoxi Jin ◽  
Jianguo Chen ◽  
Shundong Bu ◽  
Dalei Wang ◽  
Rui Dai ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Polyethylene Glycol ◽  
Solid State ◽  
Solid State Reaction ◽  
Tape Casting ◽  
Solid State Reaction Method ◽  
Component Ratio ◽  
Casting Method ◽  
Reaction Method ◽  
Method Effects

ABSTRACTThe 0.6(Bi0.85La0.15)FeO3-0.4PbTiO3 (BLF-PT) ceramics were prepared by tape casting method. Effects of binder (polyvinylbutyl dibutyl PVB), plasticizer (phthalate-polyethylene glycol DBP-PEG) and dispersant (triethylolamine, TEA) concentration on the rheological properties of BLF-PT slurry were investigated. The optimized component ratio for ceramics powders, binder, plasticizer, dispersant and solvent (ethanol, EtOH) in the slurry was 50 wt.%, 4 wt.%, 6 wt.%, 1 wt.% and 39 wt.%. The dielectric constant εr, loss tanδ, and remnant polarization Pr of BLF-PT ceramics laminated from the tapes were 525 (1 kHz), 1.7% (1 kHz) and 30 μC/cm2 (45 kV/cm), respectively, which were comparable to those of BLF-PT ceramics prepared by traditional solid state reaction method.

scholarly journals Synthesis of LiNi0.85Co0.14Al0.01O2 Cathode Material and its Performance in an NCA/Graphite Full-Battery

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1886 ◽  
Author(s):  
Cornelius Satria Yudha ◽  
Soraya Ulfa Muzayanha ◽  
Hendri Widiyandari ◽  
Ferry Iskandar ◽  
Wahyudi Sutopo ◽  
...  
Keyword(s):  
Cathode Material ◽  
Solid State Reaction Method ◽  
Electrochemical Performances ◽  
Sem Images ◽  
Voltage Range ◽  
Reaction Method ◽  
Artificial Graphite ◽  
Synthesis Routes ◽  
Xrd Patterns ◽  
Co Precipitation

Nickel-rich cathode material, NCA (85:14:1), is successfully synthesized using two different, simple and economical batch methods, i.e., hydroxide co-precipitation (NCA-CP) and the hydroxides solid state reaction method (NCA-SS), followed by heat treatments. Based on the FTIR spectra, all precursor samples exhibit two functional groups of hydroxide and carbonate. The XRD patterns of NCA-CP and NCA-SS show a hexagonal layered structure (space group: R_3m), with no impurities detected. Based on the SEM images, the micro-sized particles exhibit a sphere-like shape with aggregates. The electrochemical performances of the samples were tested in a 18650-type full-cell battery using artificial graphite as the counter anode at the voltage range of 2.7–4.25 V. All samples have similar characteristics and electrochemical performances that are comparable to the commercial NCA battery, despite going through different synthesis routes. In conclusion, the overall results are considered good and have the potential to be adapted for commercialization.

One-step low-temperature synthesis of Li0.33La0.55TiO3 solid electrolytes by tape casting method

Ionics ◽  
2020 ◽  
Vol 27 (1) ◽  
pp. 145-155
Author(s):  
Yi Huang ◽  
Yue Jiang ◽  
Yuxi Zhou ◽  
Xin Liu ◽  
Xiangming Zeng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Solid Electrolytes ◽  
Tape Casting ◽  
Casting Method ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
One Step

scholarly journals Study on Electrical conductivity and Activation Energy of doped Ceria nanostructures

2018 ◽  
Vol 3 (1) ◽  
pp. 49-53 ◽  
Author(s):  
N. S. Chitra Priya ◽  
K. Sandhya ◽  
Deepthi N. Rajendran
Keyword(s):  
Activation Energy ◽  
Nanocrystalline Materials ◽  
Arrhenius Plot ◽  
Fluorite Structure ◽  
Solid State Reaction Method ◽  
Crystalline Solid ◽  
Doped Ceria ◽  
Sem Images ◽  
Nano Crystalline ◽  
Xrd Patterns

Abstract Ce0.8Gd0.2O2−δ (GDC) and Ce0.8Sm0.2O2−δ (SDC) nanocrystalline materials are prepared by a solid state reaction method. The synthesized nano crystalline solid solutions have cubic fluorite structure as evident from XRD patterns. The materials are qualitatively analyzed by FTIR. The morphology, size and shape of grains etc. are identified from the SEM images. The grain size of GDC is smaller than that of SDC. The better morphology is obtained for GDC. Hence, this is electrically characterized. The activation energy is calculated from the slope of Arrhenius plot (showing variation of conductivity with temperature).

scholarly journals Solid-state Synthesis of Composite Structures of Various Cu(I)-based Oxides with g-C3 N4 for Harvesting Solar Energy

2018 ◽  
Vol 2 (1) ◽  
Keyword(s):  
Solid State ◽  
Solar Energy ◽  
Composite Structures ◽  
Solar Spectrum ◽  
Moderate Activity ◽  
Solar Simulator ◽  
Sem Images ◽  
One Step ◽  
The Stability ◽  
Xrd Patterns

Development of novel materials for an efficient harvesting of solar energy towards applications in environment and energy sectors is an important area of research. A metal-free polymeric material, g-C3 N4 is modified with three Cu(I)- based oxides namely Cu2 O, CuVO3 , and Cu3 VO4 to extend the absorption of the solar spectrum. The composite structures are synthesized by a facile one-step solid-state reaction under inter atmosphere and atmospheric pressure. The amounts of loadings of Cu(I)-based oxides onto g-C3 N4 is varied from 2 wt.% to 10 wt.%. Powder XRD patterns showed that the graphitic structure of carbon nitride is maintained upon the construction of hybrid structures with Cu(I) oxides. SEM images show the textural transformation of the bulk structure of g-C3 N4 into nanosheets upon thermal retreatment. FT-IR spectra further confirmed the stability of g-C3 N4 observed in the XRD patterns. In comparison with the pristine g-C3 N4 , the DR-UV-Vis spectra of the modified solid powders demonstrated a clear red shift in the absorption towards higher wavelength and their better prospects in harvesting solar energy. Tauc plots derived from the DR-UV-Vis spectra showed a narrowing of the direct-allowed band gap upon modifications with Cu(I)-based oxides. The composites showed moderate activity in photocatalytic degradation of rhodamine B under irradiation from a solar simulator

scholarly journals Study on strong spinning preparation method and mechanism of the industrial pure titanium ultrafine crystallization

2019 ◽  
Vol 14 ◽  
pp. 155892501989525
Author(s):  
Yu Yang ◽  
Yanyan Jia
Keyword(s):  
Heat Treatment ◽  
High Performance ◽  
Pure Titanium ◽  
Grain Structure ◽  
Theoretical Research ◽  
Ultrafine Grain ◽  
Forming Process ◽  
Spinning Process ◽  
And Performance ◽  
Material Utilization

Ultrafine crystallization of industrial pure titanium allowed for higher tensile strength, corrosion resistance, and thermal stability and is therefore widely used in medical instrumentation, aerospace, and passenger vehicle manufacturing. However, the ultrafine crystallizing batch preparation of tubular industrial pure titanium is limited by the development of the spinning process and has remained at the theoretical research stage. In this article, the tubular TA2 industrial pure titanium was taken as the research object, and the ultrafine crystal forming process based on “5-pass strong spin-heat treatment-3 pass-spreading-heat treatment” was proposed. Based on the spinning process test, the ultimate thinning rate of the method is explored and the evolution of the surface microstructure was analyzed by metallographic microscope. The research suggests that the multi-pass, medium–small, and thinning amount of spinning causes the grain structure to be elongated in the axial and tangential directions, and then refined, and the axial fiber uniformity is improved. The research results have certain scientific significance for reducing the consumption of high-performance metals improving material utilization and performance, which also promote the development of ultrafine-grain metals’ preparation technology.

scholarly journals Microstructure and Thermoelectric Properties of (Bi0.48Sb1.52)Te3 Thick Films Prepared with Tape Casting Method

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 140
Author(s):  
Lichen Liu ◽  
Ziping Cao ◽  
Min Chen ◽  
Jun Jiang
Keyword(s):  
Thermoelectric Properties ◽  
Low Cost ◽  
Thick Films ◽  
Tape Casting ◽  
Casting Process ◽  
Casting Method ◽  
Glass Substrates ◽  
Conductive Films ◽  
Casting Technology

This paper reports the fabrication and characterization of (Bi0.48Sb1.52)Te3 thick films using a tape casting process on glass substrates. A slurry of thermoelectric (Bi0.48Sb1.52)Te3 was developed and cured thick films were annealed in a vacuum chamber at 500–600 °C. The microstructure of these films was analyzed, and the Seebeck coefficient and electric conductivity were tested. It was found that the subsequent annealing process must be carefully designed to achieve good thermoelectric properties of these samples. Conductive films were obtained after annealing and led to acceptable thermoelectric performance. While the properties of these initial materials are not at the level of bulk materials, this work demonstrates that the low-cost tape casting technology is promising for fabricating thermoelectric modules for energy conversion.

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