Synthesis, Characterization and Dielectric Properties of BaTiO3 Nanoparticles

2019 ◽  
Vol 19 (01) ◽  
pp. 1950001
Author(s):  
Azra Haroon ◽  
Prabhakar Rai ◽  
Imran Uddin
Keyword(s):  
Sol Gel ◽  
Broad Band ◽  
Exothermic Peak ◽  
Cubic Phase ◽  
Intensity Maximum ◽  
Visible Spectra ◽  
Gel Technique ◽  
Band Gap Narrowing ◽  
Batio3 Nanoparticles ◽  
Xrd And Tem

Barium titanate (BaTiO[Formula: see text] nanoparticles having small tetragonality were prepared via sol–gel technique followed by post-calcinations at 800∘C. The tetragonal phase was confirmed by XRD and TEM measurements. The obtained nanoparticles were quasi-spherical in shape with particle size lying between 30[Formula: see text]nm and 35[Formula: see text]nm, as obtained by TEM. The prepared sample was further characterized by TGA, DSC, FTIR, UV-Vis and PL spectroscopy. The low tetragonality of the obtained nanoparticles accounts for the absence of endothermic–exothermic peak in the DSC curve. The UV-Vis spectrum reveals band gap narrowing and the PL spectrum shows a broad band covering a large part of the visible spectra with the PL intensity maximum at 568[Formula: see text]nm. The dielectric and electrical properties were studied using LCR and Two probe method, and it shows a decrease in the permittivity as well as the tetragonal to cubic phase transition temperature.

scholarly journals Synthesis and Characterization of Copper Doped Lithium Ferrite Nanocomposite

2019 ◽  
Vol 9 (2) ◽  
pp. 33-37
Keyword(s):  
Tetrahedral Site ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Ferrite Nanoparticles ◽  
Cubic Phase ◽  
Lithium Ferrite ◽  
Sem Image ◽  
Ft Ir ◽  
Gel Technique

n this paper copper doped lithium ferrite nanoparticles effectively synthesized using sol-gel technique. The synthesized product was analyzed by using TG/DTA, XRD, FT-IR, FE-SEM, HR-TEM, VSM and CV studies. TG/DTA study indicates that the thermal stable of the prepared copper doped lithium ferrite nanoparticles. XRD result confirms that copper doped lithium ferrite nanoparticles have development of cubic phase with Fd3m group and also average crystallite size calculated for different ratios using Scherrer’s formula around 40 nm. FT-IR spectra confirm the presence of absorption band of lower frequency (ν2) at octahedral site and higher frequency (ν1) at tetrahedral site of prepared nanocomposites. The FE-SEM image of CuxLi1-xFe2O4 (x=0.2) nanocomposites clearly specifies that the spherical morphology with agglomerated particles and the same is confirmed by HR-TEM study. The EDAX analysis showed that the existence of Cu, Fe and O elements. VSM study reveals that copper doped lithium ferrite nanoparticles are paramagnetic in nature. Copper doped lithium ferrite nano composites exhibits the higher specific capacitance value at 587 Fg-1 for 10 mVs-1 studied from CV.

scholarly journals Morphology Control of BaTiO3 Nanoparticles Prepared by Sol-gel Hydrothermal Method

2012 ◽  
Vol 18 (S5) ◽  
pp. 111-112 ◽  
Author(s):  
Florentina Maxim ◽  
Paula Ferreira ◽  
Paula M. Vilarinho
Keyword(s):  
Hydrothermal Method ◽  
Room Temperature ◽  
Critical Size ◽  
Ferroelectric Properties ◽  
Electronic Devices ◽  
Sol Gel ◽  
Morphology Control ◽  
Ferroelectric Material ◽  
Cubic Phase ◽  
Batio3 Nanoparticles

Barium titanate (BT), a typical ferroelectric material with a tetragonal structure bellow TC ≈125 ºC has found widespread applications especially in electronic devices. However, modern electronics demand very small functional structures and, as a consequence nanostructures of ferroeletrics are being considered. However it was observed that there is a critical size for BT nanostructures below which TC decreases, the paraelectric cubic phase is stabilized at room temperature and then ferroelectricity may no longer exist. These observations have stimulated an exponential growth of research aiming to understand the effect of scaling on the ferroelectric properties. In addition some theoretical studies predicted the enhancement of ferroelectricity in anisotropic “cylindrical” shaped nanoparticles. Therefore, the morphology control and fabrication of ferroelectric nanostructures with different size and shapes are of key importance. Within this context, we demonstrated that the control of the morphology of BT nanoparticulates can be achieved by hydrothermal method.

Ultradispersed Powdery Y2O3-Bi2O3-ZnO Composition with High Chemical Homogeneity for Fine-Grained Ceramics

2014 ◽  
Vol 87 ◽  
pp. 36-41
Author(s):  
Elena A. Trusova ◽  
Kirill V. Vokhmintcev ◽  
Aleksey N. Kirichenko
Keyword(s):  
Sol Gel ◽  
Particle Sizes ◽  
High Chemical ◽  
Chemical Homogeneity ◽  
Fine Grained ◽  
Gel Technique ◽  
Average Size ◽  
20 Nm ◽  
New Generation ◽  
Xrd And Tem

The technologically acceptable modified sol-gel technique was developed for obtaining the ultradispersed powdery composition Y2O3-Bi2O3-ZnO, which is promising new generation material for photocatalysts and solar cells. The solution for preparing a sintering composition with a high chemical homogeneity was proposed to provide using ultradispersed powders consisting of ZnO nanoparticles (40-70 nm), decorating with Bi2O3 and Y2O3 particles with average size of 4-20 nm. All synthesized powders were characterized by XRD and TEM methods. It was found that ZnO surface differently affects the dispersity of Bi2O3 and Y2O3 in the composites. TEM microphotographs show that the Bi2O3 particles uniformly distributed over ZnO surface. The Bi2O3 particle size on ZnO surface was 5-11 nm, which is significantly less than in the single powder of Bi2O3 (110-130 nm). However, in the case of Y2O3 similar effect was not observed, and average size of its crystallites was 5-12 nm, which agrees well with particle sizes in single powder.

Preparation and Deposition of Hydroxyapatite on Biomaterials by Sol-Gel Technique-A Review

2013 ◽  
Vol 1 (2) ◽  
pp. 59-69 ◽  
Author(s):  
Sarbjit Kaur ◽  
Niraj Bala ◽  
Charu Khosla
Keyword(s):  
Sol Gel ◽  
Gel Technique

Sol - Gel Technique Applied for Biomaterials Achievement

2011 ◽  
Vol 4 (3) ◽  
pp. 224-237 ◽  
Author(s):  
Aurica P. Chiriac ◽  
Loredana E. Nita ◽  
Iordana Neamtu ◽  
Manuela T. Nistor
Keyword(s):  
Sol Gel ◽  
Gel Technique

scholarly journals Tailoring Mesoporous Titania Features by Ultrasound-Assisted Sol-Gel Technique: Effect of Surfactant/Titania Precursor Weight Ratio

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1263
Author(s):  
Elvira Mahu ◽  
Cristina Giorgiana Coromelci ◽  
Doina Lutic ◽  
Iuliean Vasile Asaftei ◽  
Liviu Sacarescu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Weight Ratio ◽  
Soft Template ◽  
Synthesis Process ◽  
Mesoporous Titania ◽  
Cavitation Effect ◽  
Titania Precursor ◽  
Gel Technique ◽  
Ultrasound Assisted

A mesoporous titania structure has been prepared using the ultrasound-assisted sol-gel technique in order to find out a way to tailor its structure. The TiO2 obtained was compared to the same version of titania but synthesized by a conventional sol-gel method with the objective of understanding the effect of ultrasound in the synthesis process. All synthesis experiments were focused on the preparation of a titania photocatalyst. Thus, the anatase photocatalytic active phase of titania was proven by X-ray diffraction. Additionally, the ultrasonation treatment proved to increase the crystallinity of titania samples, being one of the requirements to having good photocatalytic activity for titania. The influence of surfactant/titania precursor weight ratio on the structural (XRD), textural (N2-sorption measurements), morphological (TEM), surface chemistry (FTIR) and optical properties (UVDR) was investigated. It was observed that the crystallite size, specific surface area, band gap energy and even photocatalytic activity was affected by the synergism occurring between cavitation effect and the surfactant/titania precursor weight ratio. The study yielded interesting great results that could be considered for further application of ultrasound to tailor mesoporous titania features via sol-gel soft template synthesis, against conventional sol-gel process.

Annealing temperatures effect on the electrical and structural properties of nanocrystalline vanadium dioxide films prepared by Sol–Gel technique

2021 ◽  
Vol 127 (5) ◽  
Author(s):  
M. M. El-Desoky ◽  
Ibrahim Morad ◽  
Mohamed. A. Ali ◽  
Atif Mossad Ali ◽  
M. A. Sayed ◽  
...  
Keyword(s):  
Structural Properties ◽  
Vanadium Dioxide ◽  
Sol Gel ◽  
Annealing Temperatures ◽  
Gel Technique

Synthesis of (Hg,Re-1223) by sol-gel technique

2000 ◽  
Vol 341-348 ◽  
pp. 2459-2460 ◽  
Author(s):  
A. Sin ◽  
P. Odier ◽  
F. Weiss ◽  
M. Núñez-Regueiro
Keyword(s):  
Sol Gel ◽  
Gel Technique
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