Study on the Synthesis of Nano-Crystalline Mg2SiO4 Powders by Aqueous Sol-Gel Process

2013 ◽  
Vol 538 ◽  
pp. 142-145 ◽  
Author(s):  
X.F. Chen ◽  
J. Li ◽  
T.T. Feng ◽  
Y.S. Jiang ◽  
X.H. Zhang ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Sol Gel ◽  
Magnesium Nitrate ◽  
Metal Alkoxides ◽  
X Ray Diffraction ◽  
Calcination Process ◽  
X Ray ◽  
Nano Crystalline ◽  
Sol Gel Process ◽  
Scanning Electron

The forsterite-structure Mg2SiO4 was successfully synthesized by the aqueous sol-gel method using Si sols dioxide and magnesium nitrate as starting materials instead of expensive organic solvent and metal alkoxides. The as-prepared nanopowders were characterized by X-ray diffraction (XRD), differential thermal analysis (DTA) and scanning electron microscope (SEM), respectively. The results showed that the calcination process of gel consisted of a series of oxidation and combustion reactions, accompanied by significantly exothermal effects. Highly reactive nanosized Mg2SiO4 powders were successfully obtained at 850 °C with particle size of 60~80 nm.

Low-Temperature Synthesis of Nano-Crystalline Zn2SiO4 Powders by Aqueous Sol-Gel Process

2013 ◽  
Vol 538 ◽  
pp. 193-196
Author(s):  
X.F. Chen ◽  
J. Li ◽  
T.T. Feng ◽  
Y.S. Jiang ◽  
X.H. Zhang ◽  
...  
Keyword(s):  
Sol Gel ◽  
Zinc Nitrate ◽  
Metal Alkoxides ◽  
X Ray Diffraction ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Calcination Process ◽  
X Ray ◽  
Nano Crystalline ◽  
Sol Gel Process

The willemite-type Zn2SiO4 was successfully synthesized by the aqueous sol-gel method using Si sols dioxide and zinc nitrate as starting materials instead of expensive organic solvent and metal alkoxides. The as-prepared nanopowders were characterized by X-ray diffraction (XRD), differential thermal analysis (DTA) and scanning electron microscope (SEM), respectively. The results showed that the calcination process of gel consisted of a series of oxidation and combustion reactions, accompanied by significantly exothermal effects. Highly reactive nanosized Zn2SiO4 powders were successfully obtained at 800 °C with particle size ~100 nm. By comparison, the aqueous sol-gel process was the most effective and least expensive technique used for the preparation of Zn2SiO4 nanopowders.

Low-Temperature Synthesis of Nano-Crystalline MgTi2O5 Powders by Aqueous Sol-Gel Process

2013 ◽  
Vol 538 ◽  
pp. 177-180 ◽  
Author(s):  
X.F. Chen ◽  
J. Li ◽  
T.T. Feng ◽  
Y.S. Jiang ◽  
X.H. Zhang ◽  
...  
Keyword(s):  
Sol Gel ◽  
Magnesium Nitrate ◽  
Metal Alkoxides ◽  
X Ray Diffraction ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
X Ray ◽  
Nano Crystalline ◽  
Transmission Electron ◽  
Sol Gel Process

The pseudobrookite-structure MgTi2O5was successfully synthesized by the aqueous sol-gel method using titanium dioxide and magnesium nitrate as starting materials instead of expensive organic solvent and metal alkoxides. The as-prepared nanopowders were characterized by X-ray diffraction (XRD), differential thermal analysis (DTA) and transmission electron microscope (TEM), respectively. The results showed that the calcinations process of gel consisted of a series of oxidation and combustion reactions, accompanied by significantly exothermal effects. Highly reactive nanosized magnesium titanate powders were successfully obtained at 650 °C with less than ~100 nm.

Low-Temperature Synthesis of Nano-Crystalline ZnTiO3 Powders by Aqueous Sol-Gel Process

2014 ◽  
Vol 543-547 ◽  
pp. 3741-3744
Author(s):  
Quan Jing Mei ◽  
Cong Ying Li ◽  
Jing Dong Guo ◽  
Gui Wang ◽  
Hai Tao Wu
Keyword(s):  
Sol Gel ◽  
Zinc Nitrate ◽  
X Ray Diffraction ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Calcination Process ◽  
X Ray ◽  
Nano Crystalline ◽  
Transmission Electron ◽  
Sol Gel Process

The ecandrewsite-type ZnTiO3was successfully synthesized by the aqueous sol-gel method using TiO2dioxide and zinc nitrate as starting materials instead of expensive organic solvent and metal alkoxides. The as-prepared nanopowders were characterized by X-ray diffraction (XRD), differential thermal analysis (DTA) and transmission electron microscopy (TEM), respectively. The results showed that the calcination process of gel consisted of a series of oxidation and combustion reactions, accompanied by significantly exothermal effects. Highly reactive nanosized ZnTiO3powders were successfully obtained at 850 °C with particle size ~50 nm. By comparison, the aqueous sol-gel process was the most effective and least expensive technique used for the preparation of ZnTiO3nanopowders.

A Study on the Preparation of Nano-Crystalline Barium Titanate Powder by a Sol-Gel Method

2007 ◽  
Vol 121-123 ◽  
pp. 53-56 ◽  
Author(s):  
J. Azadmanjiri ◽  
Hojjatollah K. Salehani ◽  
A. Dehghan Hamedan ◽  
M. Sadeghi
Keyword(s):  
Crystallite Size ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Uniform Size ◽  
Impedance Analyzer ◽  
X Ray ◽  
Nano Crystalline ◽  
Sol Gel Process ◽  
Different Temperatures ◽  
Scanning Electron

In this work, high purity BaTiO3 (BT) nano-powders by a sol-gel process was prepared with Ba(NO3)2 and Ti(C4H9O)4 materials in order to acquire uniform size grains. The effects of the crystallinity, microstructure of BT nano-powders calcined at different temperatures and dielectric properties of the ceramics were investigated by XRD, SEM and impedance analyzer, respectively. Scanning electron microscopy and X-ray diffraction investigation revealed cubic plates and crystallite size. The results revealed that crystallite size and calcination temperature of BT and influence on the dielectric constant.

Synthesis of Nano-Crystalline Magnesium Chromate Spinel by Citrate Sol-Gel Method

2011 ◽  
Vol 284-286 ◽  
pp. 730-733 ◽  
Author(s):  
Su Ping Li ◽  
Xiao Lin Jia ◽  
Ya Fang Qi
Keyword(s):  
Electron Microscopy ◽  
Crystal Size ◽  
Annealing Temperature ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nano Crystalline ◽  
Sol Gel Process ◽  
Initial Crystallization Temperature ◽  
Scanning Electron

Nanocrystalline MgCr2O4 with a crystal size of about 20nm is synthesized by citrate sol-gel process, which is characterized by X-ray diffraction (XRD), thermogravimetry coupled with differential thermal analysis (TG-DTA) and field emission scanning electron microscopy (FE-SEM). The initial crystallization temperature of MgCr2O4 spinel was at about 550°C, whereas that of the fully crystallized magnesium chromate spinel appeared at about 600°C. The crystal grain size increases with the annealing temperature and holding time.

Luminescent Properties of Zn2SiO4:Eu3+,Dy3+ Phosphors via Sol-Gel Process

2012 ◽  
Vol 217-219 ◽  
pp. 733-736
Author(s):  
Xiu Mei Han ◽  
Shu Ai Hao ◽  
Ying Ling Wang ◽  
Gui Fang Sun ◽  
Xi Wei Qi
Keyword(s):  
Thermal Analysis ◽  
Ir Spectra ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sol Gel Process ◽  
Ft Ir

Zn2SiO4:Eu3+, Dy3+ phosphors have been prepared through the sol-gel process. X-ray diffraction (XRD), thermogravimetric and ddifferential thermal analysis (TG-DTA), FT-IR spectra and photoluminescence spectra were used to characterize the resulting phosphors. The results of XRD indicated that the phosphors crystallized completely at 1000oC. In Zn2SiO4:Eu3+,Dy3+ phosphors, the Eu3+ and Dy3+ show their characteristic red(613nm, 5D0-7F2), blue (481nm, 4F9/2–6H15/2) and yellow (577nm, 4F9/2–6H13/2) emissions.

Surfactants Effect on the Photoactivity of Fe-Doped TiO2

2013 ◽  
Vol 743-744 ◽  
pp. 367-371 ◽  
Author(s):  
Qing Yun Chen ◽  
Chao Xue ◽  
Xiang Lin Li ◽  
Yun Hai Wang
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Preparation Process ◽  
X Ray Diffraction ◽  
Sunlight Irradiation ◽  
X Ray ◽  
Degradation Ratio ◽  
Scanning Electron

Ti (OC4H9)4 was used as the Ti precursor and titanium dioxide (TiO2) was prepared by sol-gel method. During the preparation process, Fe3+ was doped and different surfactants, such as SDS, PEG, CTAB, were added to improve the photocatalytic activity of TiO2. The effect of the different type of surfactants on the structure of Fe-doped TiO2 was discussed. The photocatalysts were characterized by thermogravimetric thermal analysis, X-ray diffraction, scanning electron microscopy and UV-Vis spectrophotometer. The red shift of the absorption edge of the Fe-doped TiO2 prepared by using different surfactants was observed. Methyl orange (MO) solution was degraded under sunlight irradiation to evaluate the photocatalytic performance. The results indicated that the photocatalyst prepared with PEG addition had the highest activity and MO degradation ratio could reach 90% after 4 hours irradiation with the best photocatalyst.

Preparation of Alumina Powders through Pyrocatechol, Resorcinol Mediated Sol-Gel Method

2016 ◽  
Vol 850 ◽  
pp. 742-747
Author(s):  
Xiang Zhang ◽  
Ping Yun Li ◽  
Xiao De Guo ◽  
Ting Yan
Keyword(s):  
Electron Microscopy ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grain Sizes ◽  
Xrd Study ◽  
Transmission Electron ◽  
Sol Gel Process ◽  
Scanning Electron ◽  
Organic Monomer

Ultrafine alumina powders were synthesized through pyrocatechol and resorcinol mediated sol-gel process. Aluminum nitrate was applied as the Al source and PVP was the dispersant. X-ray diffraction (XRD) study displayed that γ-Al2O3 powders formed in the range of 800-900 °C, and then γ-Al2O3 transformed to α-Al2O3 at higher temperatures, pure α-Al2O3 powders could be obtained at 1000 °C by using resorcinol as organic monomer. The results of transmission electron microscopy (TEM) revealed that Al2O3 nanoparticles with γ crystalline phase had grain sizes in the range of 5-40 nm. Scanning electron microscopy (SEM) observation displayed that the morphology of the prepared α-Al2O3 powders had aggregated bodies formed by Al2O3 grains in the range of 0.2-0.5μm. These results provide a new way of preparation of alumina powders.

scholarly journals SYNTHESIS OF FexZn1-xCr2O4 BROWN CERAMIC PIGMENT BY STARCH ASSISTED SOL-GEL PROCESS

2019 ◽  
Vol 128 (1B) ◽  
pp. 13
Author(s):  
Trần Ngọc Tuyền ◽  
Nguyễn Đức Vũ Quyên ◽  
Trần Bảo Lâm
Keyword(s):  
Sol Gel ◽  
Ceramic Pigment ◽  
Physicochemical Characteristics ◽  
Color Measurement ◽  
Ceramic Pigments ◽  
X Ray Diffraction ◽  
Color Intensity ◽  
X Ray ◽  
Sol Gel Process ◽  
Scanning Electron

In the present paper, the ceramic pigments of Fe<sub>x</sub>Zn<sub>1-x</sub>Cr<sub>2</sub>O<sub>4 </sub>(x = 0 ¸ 1) were synthesized by the starch assisted sol-gel method. The resulting pigments were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), CIE L*a*b* color measurement. The results showed that the preparation pigments of Fe<sub>x</sub>Zn<sub>1-x</sub>Cr<sub>2</sub>O<sub>4</sub>, calcinated at 1100<sup>o</sup>C for 60 minutes, obtained phases of spinel ACr<sub>2</sub>O<sub>4</sub> (A: Zn, Fe) and perovskite FeCrO<sub>3</sub> with excellent crystallinity. The brown color intensity was gradually increased as a function of the amount of substituted Fe<sup>2+</sup> ion. The achieved pigments met industrial requirements in terms of physicochemical characteristics.

scholarly journals PEMBUATAN LAPISAN TIPIS DAN SERBUK TIMBAL TITANAT DENGAN METODA SOL GEL

2015 ◽  
Vol 1 (1) ◽  
pp. 31
Author(s):  
Rahmayeni ◽  
Emriadi ◽  
Eli Susanti ◽  
Delfi Silvia
Keyword(s):  
Thin Layer ◽  
Glass Substrate ◽  
Lead Titanate ◽  
Lead Acetate ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sol Gel Process ◽  
Infra Red ◽  
Scanning Electron

 ABSTRACT Thin layer and powder of lead titanate had been prepared using lead acetate and tetraethylorthotitanate as precursor by sol gel process. The thin layer of composite was obtain through layering the composite on glass substrate. Both thin layer and powder were calcined between 100-700°C and were characterized by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), UV and Fourier Transform Infra Red (FTIR). The diffraction pattern show that the structure of composite on glass substrate is amorf at 500°C and could not identified at 700°C while the powder is crystalline at 500 and 700°C. FTIR spectra shown the Ti-O peak at 1407 cm-1, the Pb-O and Pb-O-Ti peaks at 718 and 600 cm-1, respectively. 

Sign in / Sign up

Export Citation Format

Share Document