scholarly journals Dielectric Spectroscopy Analyses of SrBi4Ti4O15Films Obtained from Soft Chemical Solution

2009 ◽  
Vol 2009 ◽  
pp. 1-6 ◽  
Author(s):  
A. Z. Simões ◽  
C. S. Riccardi
Keyword(s):  
Thin Film ◽  
Dielectric Spectroscopy ◽  
Remanent Polarization ◽  
Ferroelectric Material ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
X Ray ◽  
Dielectric Performance ◽  
Capacitance Voltage

SrBi4Ti4O15(SBTi) thin films were deposited by the polymeric precursor method on Pt bottom electrodes. The obtained films were characterized by X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and dielectric spectroscopy analyses. The capacitance-voltage (C-V) characteristics of perovskite thin film showed normal ferroelectric behavior. The remanent polarization and coercive fields were 5.4 μC/cm2and 85 kV/cm, respectively. Dielectric spectroscopy was employed to examine the polycrystalline behavior of ferroelectric material and the mechanisms responsible for the dielectric performance of the thin film.

Silver-Doped Zirconia Nanoparticles as Possible Bactericide in Water Filters

2014 ◽  
Vol 798-799 ◽  
pp. 69-74
Author(s):  
Ermerson Ney Leite Rodrigues ◽  
Edson Jansen Pedrosa Miranda Jr. ◽  
M.M. Oliveira
Keyword(s):  
Bactericidal Activity ◽  
Uv Light ◽  
Colony Growth ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
X Ray ◽  
Activity Test ◽  
Water Filters ◽  
Zirconia Nanoparticles

The objectives of this study were to produce ZrO2-based nanoparticles doped with silver, using the polymeric precursor method (Pechini), and to verify their bactericidal activity againstEscherichiacoliandStaphylococcusaureus. Zirconium and silver oxides were chosen due to their bactericidal activity. The oxides were characterized by X-ray diffraction and field emission gun-scanning electron microscopy. The support for the oxides was a porous surface used in gravity filters. The method was not effective against the bacteriumEscherichiacoliin the sample subjected to UV light for 45 min, since it did not eliminate the bacterium, and did not inhibit colony growth and formation. However, the bactericidal activity test proved effective againstStaphylococcusaureus, eliminating the bacterium when the sample was subjected to UV light for 45 min, thus preventing colony growth and formation.

XRD Analysis and Morphological Studies of Spin Coated LiNbO3 Nano Photonic Crystal Prepared for Optical Waveguide Application

2016 ◽  
Vol 1133 ◽  
pp. 457-461 ◽  
Author(s):  
Makram A. Fakhri ◽  
Y. Al-Douri ◽  
Uda Hashim ◽  
Evan T. Salim
Keyword(s):  
Spin Coating ◽  
Xrd Analysis ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
X Ray ◽  
Si Substrates ◽  
Morphological Studies ◽  
Pechini Process

Lithium niobate nanostructured thin films were deposited on (100) N-type Si substrates. Spin coating technique was used employed the polymeric precursor method (Pechini process) . The prepared films were Annealing in static air and oxygen atmosphere was performed at 500 _C for 2 h. X-ray diffraction analysis and SEM properties was carried out for films prepared at different mol concentration (0.25,0.50,0.75,1.00) Mol%. The results show a good enhancement in both structural and surface morphology of the films with increasing the concentration

Synthesis of Gadolinium Doped Ceria Ceramic Powder by Polymeric Precursor Method (Pechini)

2014 ◽  
Vol 798-799 ◽  
pp. 182-188 ◽  
Author(s):  
Jesús Mauricio González Martínez ◽  
Rodrigo Arabey Muñoz Meneses ◽  
Cosme Roberto Moreira da Silva
Keyword(s):  
Ceramic Powder ◽  
Doped Ceria ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
Calcination Process ◽  
X Ray ◽  
Before And After ◽  
Fluorite Type ◽  
Gadolinium Doped Ceria

The synthesis by polymeric precursors method (Pechini) was used to acquire gadolinium doped ceria forming Ce0,8Gd0,2O1,9 system, reaching high stoichiometric control features and nanosized particles to form dense solid electrolyte of high ionic conductivity. The synthesis was performed with cerium and gadolinium nitrates hexahydrates, citric acid and ethylene glycol. After the pre-calcination at 250°C/18h a resin was obtained like an expanded foam (puff). According to the iterature, this fact indicates that there is a reduction of agglomerates amount in a ceramic powder. A thermogravimetry-differential thermal analysis evaluated the thermal behavior of the resin. Infrared spectroscopy determined the organic matter and nitrates presence, before and after the calcination process. The X-ray diffraction identified the fluorite-type structure and was determined the crystallite size by the Scherrer equation in 22 and 46 nm for the powder calcined respectively at 600 and 800°C. The scanning electron microscopy evaluated the agglomeration degree and the morphology of the powders.

Structure effect of thin film polypropylene view by dielectric spectroscopy and X-ray diffraction: Application to dry type power capacitors

2015 ◽  
Vol 132 (39) ◽  
pp. n/a-n/a ◽  
Author(s):  
Abdelkader Kahouli ◽  
Olivier Gallot-Lavallée ◽  
Pascal Rain ◽  
Olivier Lesaint ◽  
Laurent Heux ◽  
...  
Keyword(s):  
Thin Film ◽  
Dielectric Spectroscopy ◽  
Structure Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Type Power

scholarly journals Effect of Nb on barium titanate prepared from citrate solutions

2002 ◽  
Vol 34 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Biljana Stojanovic ◽  
C.R. Foschini ◽  
M.A. Zaghete ◽  
F.O.S. Vieira ◽  
C.O. Paiva-Santos ◽  
...  
Keyword(s):  
Phase Composition ◽  
Barium Titanate ◽  
Strong Dependence ◽  
Polymeric Precursor Method ◽  
Microstructure Development ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
X Ray ◽  
Doped Barium Titanate

The influence of the addition of dopants on the microstructure development and electrical properties of BaTiO3 doped with 0.2, 0.4, 0.6, 0.8 mol% of Nb and 0.01 mol% of Mn based compounds was studied. Doped barium titanate was prepared using the polymeric precursor method from citrate solutions. The powders calcined at 700?C for 4 hours were analysed by infrared (IR) spectroscopy to verify the presence of carbonates, and by X-ray diffraction (XRD) for phase formation. The phase composition, microstructure and dielectric properties show a strong dependence on the amount of added niobium.

scholarly journals Characterization of nickel doped Zn7Sb2O12 spinel phase using Rietveld refinement

2003 ◽  
Vol 18 (3) ◽  
pp. 219-223 ◽  
Author(s):  
L. Gama ◽  
C. O. Paiva-Santos ◽  
C. Vila ◽  
P. N. Lisboa-Filho ◽  
E. Longo
Keyword(s):  
Crystal Structure ◽  
Rietveld Refinement ◽  
Spinel Phase ◽  
Pechini Method ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Inverse Spinel ◽  
Precursor Method ◽  
X Ray

Zn7Sb2O12 is known to adopt an inverse spinel crystal structure, in which Zn2+ occupies the eight tetrahedral positions and Sb5+ and Zn2+ randomly occupy the 16 octahedral positions. Samples of Zn7−xNixSb2O12 (x=0, 1, 2, 3, and 4) were synthesized using a modified polymeric precursor method, known as the Pechini method. The crystal structure of the powders was characterized by Rietveld refinement with X-ray diffraction data. The results show that for x=0, 1, and 2 Ni substitutes for Zn2+ in the octahedral sites, and that for x=3 and 4 it is assumed that Ni2+ replaces Zn2+ ions in both the octahedral and tetrahedral positions. It is also observed for x=3 and 4 the formation of two spinel phases.

scholarly journals Microstructural, structural and optical properties of nanoparticles of PbO-CrO3 pigment synthesized by a soft route

Cerâmica ◽  
2015 ◽  
Vol 61 (357) ◽  
pp. 118-125 ◽  
Author(s):  
V. D. Araújo ◽  
M. R. B. Andreeta ◽  
L. J. Q. Maia ◽  
R. M. Nascimento ◽  
F. V. Motta ◽  
...  
Keyword(s):  
Optical Properties ◽  
Diffuse Reflectance ◽  
Microstructural Properties ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Precursor Method ◽  
X Ray ◽  
Diffraction Patterns ◽  
Good Agreement

PbCrO4 and Pb2CrO5 particles were synthesized by the polymeric precursor method. Structural and microstructural properties of the particles were characterized by scanning electron microscopy with field emission gun, X-ray diffraction, and Raman spectroscopy techniques. The diffuse reflectance technique was employed to study the optical properties in the 400-700 nm range. The optical bandgap of the samples was obtained indirectly. Colorimetric coordinates L*, a*, b* were calculated for the pigment powders as a function of the heat treatment (400-700 ºC). The powders displayed colors ranging from green to red. X-ray diffraction patterns showed the presence of monoclinic PbCrO4 phase in green samples, while red powders had a monoclinic Pb2CrO5 phase structure. The Raman spectra of the PbCrO4 and Pb2CrO5 powders were in good agreement with those reported in the literature. The synthesized compounds can be used as green and red pigments with high thermal stability.

Palladium Nanowire Thin Films via Template Growth

2003 ◽  
Vol 775 ◽  
Author(s):  
Donghai Wang ◽  
David T. Johnson ◽  
Byron F. McCaughey ◽  
J. Eric Hampsey ◽  
Jibao He ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Conductive Substrate ◽  
Palladium Nanowires ◽  
Efficient Route ◽  
Silica Thin Film

AbstractPalladium nanowires have been electrodeposited into mesoporous silica thin film templates. Palladium continually grows and fills silica mesopores starting from a bottom conductive substrate, providing a ready and efficient route to fabricate a macroscopic palladium nanowire thin films for potentially use in fuel cells, electrodes, sensors, and other applications. X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicate it is possible to create different nanowire morphology such as bundles and swirling mesostructure based on the template pore structure.

scholarly journals Deep learning for visualization and novelty detection in large X-ray diffraction datasets

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Lars Banko ◽  
Phillip M. Maffettone ◽  
Dennis Naujoks ◽  
Daniel Olds ◽  
Alfred Ludwig
Keyword(s):  
Thin Film ◽  
Crystal Structure ◽  
Artificial Intelligence ◽  
Deep Learning ◽  
Novelty Detection ◽  
Structural Similarity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Patterns ◽  
Post Hoc

AbstractWe apply variational autoencoders (VAE) to X-ray diffraction (XRD) data analysis on both simulated and experimental thin-film data. We show that crystal structure representations learned by a VAE reveal latent information, such as the structural similarity of textured diffraction patterns. While other artificial intelligence (AI) agents are effective at classifying XRD data into known phases, a similarly conditioned VAE is uniquely effective at knowing what it doesn’t know: it can rapidly identify data outside the distribution it was trained on, such as novel phases and mixtures. These capabilities demonstrate that a VAE is a valuable AI agent for aiding materials discovery and understanding XRD measurements both ‘on-the-fly’ and during post hoc analysis.

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