Synthesis of Hierarchy-Structural BaTiO3 Powder Used for X8R Multilayer Ceramic Capacitors by Two-Step Soft Chemical Method

2014 ◽  
Vol 906 ◽  
pp. 3-7
Author(s):  
Jing Wang ◽  
Gui Juan Rong ◽  
Yu Ding ◽  
Ting Wei Wang ◽  
Hao Yao
Keyword(s):  
High Performance ◽  
Chemical Method ◽  
X Ray Diffraction ◽  
Multilayer Ceramic Capacitors ◽  
X Ray ◽  
Dielectric Peak ◽  
Microstructural Evaluation ◽  
The Hierarchical Structure ◽  
Multilayer Ceramic ◽  
Scanning Electron

Ba0.985Bi0.01TiO3-BaTi1-xZrxO3 powders have been synthesized by two-step soft chemical method to satisfy EIA-X8R specification. Microstructural evaluation conducted by X-ray diffraction and scanning electron microscopy confirms the hierarchical structure of the ceramic grain. The shape of the ε-T curves near the dielectric peak becomes broad with the increase of Zr content. The permittivity of Ba0.985Bi0.01TiO3-BaTi0.9Zr0.1O3 ceramic is ~3000, C/C20 °C is-14.67%, 6.23% and-14.50% at-55°C, 130°C and 160°C, respectively, and the dielectric loss is less than 0.020. This work shows that the two-step soft chemical method is a promising approach for high performance temperature-stable capacitor materials.

Synthesis and Study the Properties of a Solar Cell of Gold Nanoparticles Prepared in a Simple Chemical Way

2021 ◽  
Vol 19 (11) ◽  
pp. 66-71
Author(s):  
Maithm A. Obaid ◽  
Suha A Fadaam ◽  
Osama S. Hashim
Keyword(s):  
Electron Microscopy ◽  
Gold Nanoparticles ◽  
Chemical Method ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Casting Method ◽  
X Ray ◽  
Transmission Electron ◽  
Simple Chemical ◽  
Scanning Electron

The aim of this study is to prepare gold nanoparticles by a simple chemical method at a temperature of 70°C. The solution was dried on glass basest by Casting method, the rate of five drops per sample At a temperature 100 C. Then the structural and optical properties have been confirmed by X-ray diffraction, scanning electron microscopy (SEM) and Transmission Electron microscope (TEM), Fourier Transform Infrared Spectroscopy (FTIR) and spectrum.

High-performance electrical properties of La-based perovskite ceramics for the functional phase of thick film resistors

2020 ◽  
Author(s):  
Yongcheng Lu ◽  
Yuanxun Li ◽  
Daming Chen ◽  
Rui Peng ◽  
Qinghui Yang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electrical Properties ◽  
Thick Film ◽  
High Performance ◽  
Composite Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alternative Material ◽  
Perovskite Ceramics ◽  
Scanning Electron

Abstract In order to explore an economical functional phase alternative material for thick film resistors, the crystal structure, microstructure, and electrical properties of (1-x)LSCN + xLCNZ (x = 0.0–1.0) composite ceramics were studied through solid-state reaction experiments. The composite ceramics were characterized by x–ray diffraction, scanning electron microscopy, energy dispersive x–ray spectroscopy, and DC four–probe method. Results suggested that the main phases of LSCN and LCNZ were formed, along with a small part of impurity phases. The addition of LCNZ to LSCN decreased the electrical conductivity and changed the TCR from positive to negative. Zero TCR could be achieved around 0.6 < x < 0.8 and relatively low absolute TCR values could be obtained for the samples of 0.4 ≤ x ≤ 0.8. The ceramic of 0.6LSCN + 0.4LCNZ showed the optimal performances of conductivity = 1923 S/cm, TCR = 379.54 ppm/℃, and relative density = 95.05%.

Microstructural Evaluation of Clayey Ceramic Incorporated with Sludge from Paper Manufacturing

2016 ◽  
Vol 881 ◽  
pp. 422-426
Author(s):  
Carlos Maurício Fontes Vieira ◽  
Regina Maria Pinheiro ◽  
Sergio Neves Monteiro
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Optical Microscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Paper Making ◽  
Paper Manufacturing ◽  
Microstructural Evaluation ◽  
Calcium Compounds ◽  
Scanning Electron

This work has for objective to evaluate the microstructure of clayey ceramic incorporated with a waste in the form of sludge generated during treatment of effluent of a paper making industry. The microstructure of ceramics incorporated with 0 and 10 wt.% of waste, and then fired at 600°C, was evaluated by optical microscopy, scanning electron microscopy and X-ray diffraction. The results showed that the waste changes the microstructure of the clayey ceramic increasing the porosity, as well as forming new crystalline phases, mainly with calcium compounds.

Microstructural Evaluation of Clayey Ceramic Incorporated with Powder Waste from the Sintering Plant of a Steel-Making Industry

2012 ◽  
Vol 727-728 ◽  
pp. 951-956 ◽  
Author(s):  
Carlos Maurício Fontes Vieira ◽  
Mônica Manhães Ribeiro ◽  
Sérgio Neves Monteiro
Keyword(s):  
Iron Ore ◽  
Mercury Porosimetry ◽  
Particulate Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Steel Sheets ◽  
Steel Making ◽  
Microstructural Evaluation ◽  
Sintering Plant ◽  
Scanning Electron

Steel making in integrated plants involves several stages from the feeds tock preparation, by sintering or pelleting of the iron ore, to the rolling of the steel sheets. In any of these stages wastes are generated and unless recycled or used as by product, they will cause serious environmental problems. Therefore, this work has as its objective to evaluate the effect of incorporation of 20 wt.% of the powder waste, particulate material, retained in the eletrostatic precipitator equipment of the sintering stage from an integrated steel making plant on the microstructure a clayey ceramic fired at 1050°C. The microstructure of the fired ceramics was evaluated by scanning electron microscopy, X-ray diffraction and mercury porosimetry. The results showed that in the investigated temperature the waste increased the porosity of the clayey ceramic as well as introduced defects in the microstructure of the ceramic.

Synthesis, Structural Characterization and Morphological Studies of Nanocrystalline CdO by Wet-Chemical Method

2018 ◽  
Vol 24 (8) ◽  
pp. 5519-5522
Author(s):  
Israr Ul Hassan ◽  
Liji John ◽  
R. Selwin Joseyphus ◽  
I. Hubert Joe ◽  
R. S Amritha ◽  
...  
Keyword(s):  
Grain Size ◽  
Chemical Method ◽  
Cadmium Oxide ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
X Ray ◽  
Morphological Studies ◽  
Oxide Particles ◽  
Wet Chemical ◽  
Scanning Electron

Synthesis of nanocrystalline cadmium oxide particles were explored by the reaction of inorganic precursor (cadmium chloride) and alkali (sodium hydroxide) via modified wet-chemical method followed by annealing at various temperatures (250, 500 and 750 °C). The structural, optical and morphological studies of cadmium oxide samples were carried out by X-ray diffraction, infrared, ultraviolet-visible, and scanning electron microscope techniques. From X-ray diffraction analysis, it was confirmed that cadmium oxide particles furnish a face centred cubic phase structure and revealing a grain size of around 59 nm. The scanning electron microscope micrographs admit that cadmium oxide samples are agglomerated and have spherical shapes. The bonding deformation and stretching frequency results of cadmium oxide samples were obtained from infrared spectra. The corresponding increase in calcination temperatures has shown an increase in particle size while as no change was found in band gape. These results attribute that the variation in annealing temperature has a significant role on the crystalline nature, grain size and its optical properties. Furthermore, the synthesized cadmium oxide samples were examined for bioactivity analysis.

Preparation Ag2S Nanorods and Nanoparticles via a Simple Chemical Method

2011 ◽  
Vol 364 ◽  
pp. 500-503 ◽  
Author(s):  
S. J. Kasim ◽  
F. H. Khaleel ◽  
F. A. Kasim ◽  
M.A. Mahdi
Keyword(s):  
Electron Microscopy ◽  
Chemical Method ◽  
Atomic Ratio ◽  
S Phase ◽  
Molar Concentration ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sem Image ◽  
Simple Chemical ◽  
Scanning Electron

Ag2S nanorods and nonoparticles have been successfully prepared using chemical method. Silver nitrate with molar concentration of 0.1 M and thiourea with different molar concentration were used as a source of Ag++and S++ions, respectively. The pH of solution was in range of 10-11. Scanning electron microscopy (SEM) image showed that the nanorods length and diameter were 2.5-3 μm and 300-400 nm, respectively. X-ray diffraction results showed a monoclinic α-Ag2S phase was obtained. The atomic ratio of silver and sulphur were found using energy dispersive spectroscopy (EDS) and it was 62.39% and 37.61%, respectively.

Study the Effect of HAp Content in PLA/HAp Microsphere on the Efficiency of Drug (Clindamycin) Loading Process

2013 ◽  
Vol 834-836 ◽  
pp. 559-562 ◽  
Author(s):  
Juntima Pradid ◽  
Wirunya Keawwattana ◽  
Siree Tangbunsuk
Keyword(s):  
Electron Microscopy ◽  
Thermal Process ◽  
High Performance ◽  
Core Shell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ultrasound Field ◽  
Sample Characterization ◽  
Core Shell Structure ◽  
Scanning Electron

An ultrasound field was applied to obtain Polylactic acid (PLA)/Hydroxyapatite (HAp) biocomposite microspheres with the specific core-shell structure to be applied as a carrier of a drug. The hydroxyapatite was obtained from crocodile bone by thermal process. Sample characterization was achieved by powder X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX) Scanning electron microscopy (SEM) and High Performance Liquid Chromatography (HPLC). As the result, the PLA/HAp loading clindamycin with different polymer-to-ceramic part wt.% ratio (100:0, 90:10, 80:20, and 70:30) showed the agglomeration of sphere-like particles. In addition, the loading efficiency of clindamycin increased with increasing HAp content up to 20%.

Novel Hierarchical TiO2/C Nanocomposite with Enhanced Photocatalytic Performance

NANO ◽  
2015 ◽  
Vol 10 (05) ◽  
pp. 1550064 ◽  
Author(s):  
Yupeng Gao ◽  
Hao Chen ◽  
Aiguo Zhou ◽  
Zhengyang Li ◽  
Fanfan Liu ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
Photocatalytic Property ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Carbon Nanocomposites ◽  
Carbon Nanosheets ◽  
X Ray ◽  
The Hierarchical Structure ◽  
Different Temperatures ◽  
Scanning Electron

Hierarchical TiO 2/carbon nanocomposites were synthesized by oxidation of two-dimensional (2D) Ti 3 C 2 nanosheets at different temperatures. Crystal structures and morphologies of the obtained samples were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and Raman spectroscopy. The results show that 2D Ti 3 C 2 nanosheets are partially oxidized to form a novel hierarchical nanostructure which is composed of carbon nanosheets and TiO 2 nanoparticles. With the calcination temperature increasing, the crystal structure of TiO 2 nanoparticles changes from anatase to rutile and the hierarchical structure was gradually destroyed. The photodegradation results reveal that the samples obtained at 200°C and 285°C show much better photocatalytic properties than P25. And meanwhile the photocatalytic property will become worse with the increase in calcinations temperature.

Hierarchically Porous Carbon/MnO2 Nanocomposites as High-Performance Electrode for Asymmetric Supercapacitors

2014 ◽  
Vol 1070-1072 ◽  
pp. 530-533
Author(s):  
Yu Rong Liu ◽  
Jia Liu
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Asymmetric Supercapacitor ◽  
X Ray Diffraction ◽  
Excellent Performance ◽  
Asymmetric Supercapacitors ◽  
Hierarchically Porous ◽  
X Ray ◽  
Supercapacitor Applications ◽  
Scanning Electron

Hierarchically porous carbon (HPC)/MnO2 nanocomposites were fabricated for asymmetric supercapacitor applications. The microstructures of HPC/MnO2 nanocomposites were characterized by X-ray diffraction and scanning electron microscopy. The asymmetric supercapacitor consisting of a HPC/MnO2 cathode and a HPC anode shows an excellent performance with energy density and power density of 23.8 Wh kg-1 and 12.5 kW kg-1, respectively. In addition, the asymmetric supercapacitor exhibits an excellent cycle life with 91% retention of capacitance after 1000 cycles.

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