Synthesis, FT-IR and X-Ray Diffraction Investigations of Gadolinium-Substituted Pyrochlore Oxide Gd1.82Cs0.18Ti2O6.82 via a Sol—Gel Process.

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.

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Synthesis, Raman and X-ray diffraction investigations of rubidium-doped Gd1.8Ti2O6.7 pyrochlore oxide via a sol–gel process

Journal of Crystal Growth ◽

10.1016/j.jcrysgro.2007.03.021 ◽

2007 ◽

Vol 304 (2) ◽

pp. 374-382 ◽

Cited By ~ 26

Author(s):

A. Garbout ◽

S. Bouattour ◽

A.M. Botelho do Rego ◽

A. Ferraria ◽

A.W. Kolsi

Keyword(s):

Sol Gel ◽

X Ray Diffraction ◽

X Ray ◽

Sol Gel Process ◽

Pyrochlore Oxide

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Preparation and Characterization of Pr2Ti2O7 by Sol-Gel Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.748.413 ◽

2017 ◽

Vol 748 ◽

pp. 413-417

Author(s):

Chun Yu Long ◽

Fang Fang Peng ◽

Min Min Jin ◽

Pei Song Tang ◽

Hai Feng Chen

Keyword(s):

Methyl Orange ◽

Single Phase ◽

Raw Materials ◽

Sol Gel ◽

X Ray Diffraction ◽

Illumination Time ◽

X Ray ◽

Sol Gel Process ◽

Ft Ir

Using Pr (NO3)3, butyl titanate, ethylene glycol and citric acid as main raw materials, praseodymium titanate (Pr2Ti2O7) was prepared by the sol-gel process. The samples were characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), thermal gravity-differential thermal analysis (TG-DTA), diffuse-reflection spectra (DRS) and Fourier transform infrared (FT-IR). The effect of different calcination temperature and illumination time on the photocatalytic properties of Pr2Ti2O7 was investigated. It was found that the single phase Pr2Ti2O7 could be obtained through sol-gel process and calcination at 1000 °C. The Pr2Ti2O7 samples calcination at 1000 °C were uniform , and the resulting product had a particle size of 200 nm and an optical band gap of 3.26 eV. Under ultraviolet light, the degradation of methyl orange arrived to 80.11% after 180 min of photocatalytic reaction. The Pr2Ti2O7 samples showed good photocatalytic activity for decomposition of methyl orange.

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Synthesis and Characterization of Bi2Al4O9 Powders

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.624.34 ◽

2012 ◽

Vol 624 ◽

pp. 34-37

Author(s):

Xiao Yan Zhang ◽

Wen Shu Hu ◽

Xi Wei Qi ◽

Gui Fang Sun ◽

Jian Quan Qi ◽

...

Keyword(s):

Crystallization Process ◽

Sol Gel ◽

Xrd Analysis ◽

X Ray Diffraction ◽

Absorption Bands ◽

X Ray ◽

Oxide Powders ◽

Sol Gel Process ◽

Ft Ir

Bi2Al4O9 powders were prepared by sol-gel process. The precursors were heated at 500-800°C for 2h to obtain Bi2Al4O9 powder and X-ray diffraction (XRD), Differential thermal analysis (DTA), thermogravimetric analysis (TG), field emission scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR) techniques were used to characterize precursor and derived oxide powders. XRD analysis show that the powder is still amorphous after calcined at 500°C. The peaks of Bi2Al4O9 become sharp after calcined at 575°C though still existing some amorphous phase. After calcining at 675-800°C, the powder has fully turned into pure Bi2Al4O9 phase. The crystallization process can also be confirmed by DTA-TG and IR. Calcining the precursor at 575°C, the absorption bands at 527 cm-1, 738 cm-1, 777 cm-1, and 919 cm-1are observed, which are assigned to Bi2Al4O9 and becoming stronger and sharper with the increase of temperature.

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Synthesis and Mechanical Properties of Advanced Polyimide/Silicon Dioxide Nanocomposites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.561-565.709 ◽

2007 ◽

Vol 561-565 ◽

pp. 709-712 ◽

Cited By ~ 1

Author(s):

Qing Xin Zhang ◽

Kimiyoshi Naito ◽

Yutaka Kagawa

Keyword(s):

Silicon Dioxide ◽

Coupling Agent ◽

Sol Gel ◽

Sio2 Nanoparticles ◽

X Ray Diffraction ◽

Interatomic Distances ◽

X Ray ◽

Sol Gel Process ◽

Ft Ir ◽

Sio2 Nanocomposites

Hybrid inorganic-organic materials based on a polyimide (PI) and silicon dioxide (SiO2) were prepared previously only via sol-gel approach. However, sol-gel processes have some critical limitations. The primary drawback is that the resultant gel is extremely fragile and sol-gel process is complicated and costly. In this study, using SiO2 nanoparticles polyimide/SiO2 nanocomposites were synthesized from 4,4'-diaminodiphenyl ether (ODA) and 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA). A coupling agent, 3-glycidyloxyporpl trimethoxysilane (GTMOS), was used to functionalize the SiO2 nanoparticles which enhanced the compatibility between polyimide and SiO2 nanoparticles. The microstructures of polyimide/SiO2 nanocomposites were characterized by Fourier transform infrared spectroscopy (FT-IR) and wide angle X-ray diffraction (WAXD). All the polyimides show typical noncrystalline X-ray diffraction. The frequent occurrence of particular interatomic distances (R) denoted by the noncrystalline WAXD maxima were determined. All the modulus, strength and fracture strain of polyimide were improved with 5 wt% SiO2 modified with the coupling agent.

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Synthesis and characterization of nanocrystalline barium strontium titanate powder by a modified sol-gel processing

Materials Science-Poland ◽

10.1515/msp-2016-0020 ◽

2016 ◽

Vol 34 (1) ◽

pp. 63-68 ◽

Cited By ~ 12

Author(s):

M.E. Azim Araghi ◽

N. Shaban ◽

M. Bahar

Keyword(s):

Sol Gel ◽

Research Work ◽

Titanium Isopropoxide ◽

Barium Acetate ◽

X Ray Diffraction ◽

X Ray ◽

Sol Gel Process ◽

Crystallite Sizes ◽

Ft Ir ◽

Strontium Acetate

AbstractIn this research work, nanocrystalline BST (Ba0.6Sr0.4TiO3) powders were synthesized through a modified sol-gel process, using barium acetate, strontium acetate and titanium isopropoxide as the precursors. In this process, stoichiometric proportions of barium acetate and strontium acetate were dissolved in acetic acid and titanium (IV) isopropoxide was added to form BST gel. The as-formed gel was dried at 200 °C and then calcined in the temperature range of 600 to 850 °C for crystallization. The samples were characterized by infrared spectroscopy method (FT-IR), X-ray diffraction technique (XRD) and field emission scanning electron microscope (FESEM) and energy dispersive X-ray spectroscopy. EDS analysis of these samples confirmed the formation of the final phase with the special stoichiometry. The formation of a cubic perovskite crystalline phase with nanoscale dimension was detected using the mentioned techniques. The results showed that the obtained crystallite sizes were 33 and 37 nm for BST powder calcined at 750 and 850 °C, respectively.

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Luminescent Properties of MgLaLiSi2O7:Eu3+ Phosphors via Sol-Gel Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.178 ◽

2012 ◽

Vol 512-515 ◽

pp. 178-181

Author(s):

Xiu Mei Han ◽

Deng Hui Ren ◽

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 ◽

The Eu

MgLaLiSi2O7:Eu3+ 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. FT-IR spectra suggested that crystallized silicates have formed in the powders annealed at 1050°C. The results of XRD indicated that the phosphors crystallized completely at 1050°C. In MgLaLiSi2O7:Eu3+ phosphors, the Eu3+ shows its characteristic red (613nm, 5D0–7F2) emissions.

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Sol-Gel derived Bi4-xNdxTi3O12 Thin Films and Their Characterization

MRS Proceedings ◽

10.1557/proc-737-f3.35 ◽

2002 ◽

Vol 737 ◽

Author(s):

R.E. Melgarejo ◽

M.S. Tomar ◽

A. Hidalgo ◽

R.S. Katiyar

Keyword(s):

Thin Films ◽

Spin Coating ◽

Bismuth Titanate ◽

Sol Gel ◽

X Ray Diffraction ◽

X Ray ◽

Complete Solid Solution ◽

Sol Gel Process ◽

Ferroelectric Memory ◽

Initial Results

ABSTRACTNd substituted bismuth titanate Bi4-xNdxTi3O12 were synthesized by sol-gel process and thin films were deposited on Pt substrate (Pt/TiO2/SiO2/Si) by spin coating. Thin films, characterized by X-ray diffraction and Raman spectroscopy, shows complete solid solution up to the composition x < 1. Initial results indicate that the ferroelectric polarization increases with increasing Nd content in the film with 2Pr = 50μC/cm2 for x = 0.46, which may have application in non-volatile ferroelectric memory devices.

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Synthesis and Characterizations of Strontium Substituted Hydroxyapatite Thin Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.93-94.231 ◽

2010 ◽

Vol 93-94 ◽

pp. 231-234

Author(s):

B. Hongthong ◽

Satreerat K. Hodak ◽

Sukkaneste Tungasmita

Keyword(s):

Thin Film ◽

Thin Films ◽

Chemical Composition ◽

Spin Coating ◽

Phase Structure ◽

Sol Gel ◽

Cross Linking ◽

X Ray Diffraction ◽

X Ray ◽

Sol Gel Process

Strontium substituted hydroxyapatite(SrHAp) were fabricated both in the form of powder as reference and thin film by using inorganic precursor reaction. The sol-gel process has been used for the deposition of SrHAp layer on stainless steal 316L substrate by spin coating technique, after that the films were annealed in air at various temperatures. The chemical composition of SrHAp is represented (SrxCa1-x)5(PO4)3OH, where x is equal to 0, 0.5 and 1.0. Investigations of the phase structure of SrHAp were carried out by using X-ray diffraction technique (XRD). The results showed that strontium is incorporated into hydroxyapatite where its substitution for calcium increases in the lattice parameters, and Sr3(PO4)2 can be detected at 900°C. The SEM micrographs showed that SrHAp films exhibited porous structure before develop to a cross-linking structure.

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