Preparation of LSMO/PLZT Composite Film by Sol-Gel Technique and its Ferroelectric and Ferromagnetic Properties

2015 ◽  
Vol 815 ◽  
pp. 166-170
Author(s):  
Zong Fan Duan ◽  
Juan Ning Wei ◽  
Ying Cui ◽  
Gao Yang Zhao
Keyword(s):  
Composite Film ◽  
Sol Gel ◽  
Hysteresis Loops ◽  
Magnetic Behavior ◽  
Single Crystal Substrate ◽  
X Ray Diffraction ◽  
Ferromagnetic Properties ◽  
Crystal Substrate ◽  
Ferromagnetic Hysteresis ◽  
Gel Technique

La0.67Sr0.33MnO3 (LSMO)/Pb0.92La0.08Zr0.65Ti0.35O3 (PLZT) composite film was fabricated on a (001) LaAlO3 (LAO) single crystal substrate by a sol-gel technique. The results from X-ray diffraction (XRD) indicated that LSMO and PLZT could grow successively on LAO substrate with (001) preferred orientation. The ferroelectric and ferromagnetic properties of LAO/LSMO/PLZT composite film were also investigated. The results showed that the remnant polarization Pr, and coercive field Ec of the composite film at room temperature were 36.38 μC/cm2 and 512.43 kV/cm respectively. Moreover, the composite film exhibited significant ferromagnetic hysteresis loops and soft magnetic behavior at temperatures lower than 250 K.

The Electrical Properties of Epitaxial Grown Sc-Doped (Na0.85K0.15)0.5Bi0.5TiO3 Thin Film Prepared by Sol-Gel Method

2016 ◽  
Vol 697 ◽  
pp. 235-238
Author(s):  
Yun Yi Wu ◽  
Xiao Hui Wang ◽  
Cai Fu Zhong ◽  
Long Tu Li
Keyword(s):  
Thin Film ◽  
Sol Gel ◽  
Hysteresis Loops ◽  
Single Crystal Substrate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Transmission Electron ◽  
Crystal Substrate ◽  
Lcr Meter ◽  
Ferroelectric Hysteresis

Sc-doped (Na0.85K0.15)0.5Bi0.5TiO3 (NKBT-Sc) thin film was deposited on electrical conductive Nb-doped SrTiO3 [100] (Nb:STO) single crystal substrate via an aqueous sol–gel method. Structure analysis by x-ray diffraction and high resolution transmission electron microscopy proves the epitaxial growth relationship between the NKBT-Sc thin film and Nb:STO substrate. Well saturated ferroelectric hysteresis loops with remnant polarization of 26.14 μC/cm2 and typical butterfly shape displacement–voltage loop with effective piezoelectric coefficient d33* of 92 pm/V were observed, which were much higher than the NKBT-Sc thin film deposited on platinized silicon substrate. The precision LCR Meter exhibits a butterfly shape of dielectric constant and electric field curve, which is typical nature for the ferroelectric characteristics of the [001]-epitaxial NKBT-Sc thin film.

scholarly journals Bi1−xEuxFeO3 Powders: Synthesis, Characterization, Magnetic and Photoluminescence Properties

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1465 ◽  
Author(s):  
Vasile-Adrian Surdu ◽  
Roxana Doina Trușcă ◽  
Bogdan Ștefan Vasile ◽  
Ovidiu Cristian Oprea ◽  
Eugenia Tanasă ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Bismuth Ferrite ◽  
Sol Gel ◽  
Magnetic Behavior ◽  
Weak Ferromagnetism ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Characteristic Emission ◽  
Gel Technique ◽  
Comparative Results

Europium substituted bismuth ferrite powders were synthesized by the sol-gel technique. The precursor xerogel was characterized by thermal analysis. Bi1−xEuxFeO3 (x = 0–0.20) powders obtained after thermal treatment of the xerogel at 600 °C for 30 min were investigated by X-ray diffraction (XRD), scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Raman spectroscopy, and Mössbauer spectroscopy. Magnetic behavior at room temperature was tested using vibrating sample magnetometry. The comparative results showed that europium has a beneficial effect on the stabilization of the perovskite structure and induced a weak ferromagnetism. The particle size decreases after the introduction of Eu3+ from 167 nm for x = 0 to 51 nm for x = 0.20. Photoluminescence spectroscopy showed the enhancement of the characteristic emission peaks intensity with the increase of Eu3+ concentration.

scholarly journals Ferroelectric and Dielectric Properties of ZnFe2O4-Pb(ZrTi)O3Multiferroic Nanocomposites

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Shrabanee Sen ◽  
Sk. Md. Mursalin ◽  
M. Maharajan
Keyword(s):  
Lead Zirconate Titanate ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Hysteresis Loops ◽  
Lead Zirconate ◽  
X Ray Diffraction ◽  
Nanosized Powders ◽  
X Ray ◽  
Magnetoelectric Composites ◽  
Gel Technique

Magnetoelectric composites of zinc ferrite and soft lead zirconate titanate (PZT) having formula 0.5 ZnFe2O4-0.5 PZT were synthesized by sol-gel technique. X-ray diffraction analysis was carried out to confirm the coexistence of individual phase. TEM micrographs were taken to confirm the formation of nanosized powders and SEM micrographs were taken to study the morphology of the sintered pellets. Dielectric and P-E hysteresis loops were recorded, respectively, to confirm the ferroelectric properties of the composites.

Effect of Mn Doping on the Structural and Ferroelectric properties of SrBi2Ta2O9

2004 ◽  
Vol 848 ◽  
Author(s):  
T. Sookawee ◽  
L. Pdungsap ◽  
P. Winotai ◽  
R. Suryanarayanan ◽  
V.M. Naik ◽  
...  
Keyword(s):  
Raman Spectra ◽  
Layer Structure ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Hysteresis Loops ◽  
Structural Quality ◽  
X Ray Diffraction ◽  
Mn Doping ◽  
Gel Technique

ABSTRACTSrBi2Ta2O9 (SBT) samples have been prepared by sol-gel technique with varying amount of excess Bi added to the starting composition. The excess Bi profoundly affects the dielectric and ferroelectric properties. The dielectric constant (ε) and remnant polarization increases from 80 and 1.4 μ C/cm2 for SBT with 1 mole % of excess Bi to 120 and 6.5 μ C/cm2 for SBT with 20 mole % of excess Bi. The Raman spectra, scanning electron microscopy images and the x-ray diffraction analysis show an improvement in structural quality of the samples with addition of excess Bi to the starting composition. The effect of Mn doping has also been studied by preparing SrBi2Ta2-x Mnx O9 (SBT-Mn) with x = 0 – 0.1. In the case of SBT-Mn samples, the XRD spectra revealed an unknown phase when x > 0.025. However, Raman spectra reveal the retention of Bi layer structure for all Mn compositions, with possibly small distortions. With Mn addition, ε increased to ∼ 140 for x < 0.005, but decreased to ≤ 120 when x > 0.015. The value of ε is independent of frequency from 60 to 85 kHz for all compositions of Mn. The effect of Mn addition resulted in a strong decrease in the area of the hysteresis loops.

scholarly journals Nanocomposite Film Containing Fibrous Cellulose Scaffold and Ag/TiO2 Nanoparticles and Its Antibacterial Activity

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1052 ◽  
Author(s):  
Yanxiang Li ◽  
Jessica Tian ◽  
Chuanfang Yang ◽  
Benjamin Hsiao
Keyword(s):  
Antibacterial Activity ◽  
Composite Film ◽  
Tio2 Nanoparticles ◽  
Uv Light ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
E Coli ◽  
Slowing Down ◽  
Gel Technique ◽  
Cellulose Composite

Cellulose is a natural polymer that is widely used in daily life, but it is susceptible to microorganism growth. In this study, a simple sol–gel technique was utilized to incorporate the cellulose scaffold with Ag/TiO2 nanoparticles. The morphology and crystal structure of the as-prepared Ag/TiO2/cellulose composite film were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods. Antibacterial tests involving the use of Escherichia coli (E. coli) were carried out under dark and UV-light conditions to evaluate the efficiency of the Ag/TiO2/cellulose composite film in comparison with pristine cellulose paper and TiO2/cellulose composite film. The results indicated that the antibacterial activity of the Ag/TiO2/cellulose composite film outperformed all other samples, where the Ag content of 0.030 wt% could inhibit more than 99% of E. coli. This study suggests that finely dispersed nanocale Ag/TiO2 particles in the cellulose scaffold were effective at slowing down bacterial growth, and the mechanisms of this are also discussed.

Preparation and Characterization of Zn-Containing Hydroxyapatite/TiO2 Composite Coatings on Ti Alloys

2011 ◽  
Vol 685 ◽  
pp. 367-370 ◽  
Author(s):  
Min Qi ◽  
Da Yi Yang ◽  
Jing Ying Zhang ◽  
Hong Jun Ai
Keyword(s):  
Adhesion Strength ◽  
Composite Coatings ◽  
Energy Dispersive Spectrometer ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Zn Content ◽  
Micro Arc Oxidation ◽  
Gel Technique ◽  
Bacteria Resistance

In order to improve the osteoblast growth and bacteria resistance, Zn-containing hydroxyapatite (Zn-HA) and titanium oxide (TiO2) composite coatings were prepared to improve binding between coating and Ti substrate. TiO2 film was prepared on the surface of Ti by micro-arc oxidation (MAO) and Zn-HA coating was deposited on TiO2 using sol–gel technique. Phase structure, composition and microstructure of the surface coatings were analyzed by X-ray diffraction (XRD) and Energy Dispersive Spectrometer (EDS), respectively. The adhesion strength between the coatings with different Zn content was measured by tensile testing. The results showed that there was no significant influence of Zn content on adhesion strength between coating and Ti substrate.

Characterization of SrBi2Nb2O9 Thin Films Prepared by Sol Gel Technique

1996 ◽  
Vol 459 ◽  
Author(s):  
E. Ching-Prado ◽  
W. Pérez ◽  
A. Reynés-Figueroa ◽  
R. S. Katiyar ◽  
D. Ravichandran ◽  
...  
Keyword(s):  
Thin Films ◽  
Raman Band ◽  
Sol Gel ◽  
Orthorhombic Symmetry ◽  
X Ray Diffraction ◽  
Ft Ir ◽  
Gel Technique ◽  
High Degree ◽  
First Time

ABSTRACTThin films of SrBi2Nb2O9 (SBN) with thicknesses of 0.1, 0.2, and 0.4 μ were grown by Sol-gel technique on silicon, and annealed at 650°C. The SBN films were investigated by Raman scatering for the first time. Raman spectra in some of the samples present bands around 60, 167, 196, 222, 302, 451, 560, 771, 837, and 863 cm−1, which correspond to the SBN formation. The study indicates that the films are inhomogeneous, and only in samples with thicknesses 0.4 μ the SBN material was found in some places. The prominent Raman band around 870 cm−1, which is the A1g mode of the orthorhombic symmetry, is assigned to the symmetric stretching of the NbO6 octahedrals. The frequency of this band is found to shift in different places in the same sample, as well as from sample to sample. The frequency shifts and the width of the Raman bands are discussed in term of ions in non-equilibrium positions. FT-IR spectra reveal a sharp peak at 1260 cm−1, and two broad bands around 995 and 772 cm−1. The bandwidths of the latter two bands are believed to be associated with the presence of a high degree of defects in the films. The experimental results of the SBN films are compared with those obtained in SBT (T=Ta) films. X-ray diffraction and SEM techniques are also used for the structural characterization.

scholarly journals Calcination Effect on Structural Trasformation of Barium Titanite Ferroelectric Ceramic by Sol-Gel Method

2019 ◽  
Vol 9 (1) ◽  
pp. 5893-5896
Keyword(s):  
Glacial Acetic Acid ◽  
Sol Gel ◽  
Ferroelectric Ceramic ◽  
Tetrabutyl Titanate ◽  
Chemical Modifier ◽  
Barium Acetate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gel Technique ◽  
Scanning Electron

High purity barium titanate BaTiO3 was successfully synthesized by using the sol-gel technique. Barium acetate Ba(CH3COO)2 and tetrabutyl titanate, Ti(C4H9O)4 was dissolved moderately in the solvent of glacial acetic acid and ethanol was added as the chemical modifier. The synthesized BaTiO3 nanoparticle was calcined at the temperature range of 700 ºC to 1100 ºC. The powders were further characterized by X-ray diffraction and scanning electron microscopy (SEM). Fined BaTiO3 powders result indicates the phase of tetragonal structures and high crystallites of BaTiO3. It was observed that the crystallinity and particle size of BaTiO3 is greatly influenced by the calcination temperature.

scholarly journals Molecular-field Molecular-field Study on Sn Substituted Yttrium Iron Garnet

2018 ◽  
Vol 34 (1) ◽  
Author(s):  
Nguyen Duong
Keyword(s):  
Sol Gel ◽  
Site Occupancy ◽  
Molecular Field ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
Valence States ◽  
Two Samples ◽  
Gel Technique ◽  
Electron Scanning Microscope ◽  
Iron Garnet

Samples with the compositions Y2.9Ca0.1Fe4.9Sn0.1O12 and Y3Fe4.9Sn0.1O12 were prepared by using a sol-gel technique. The influence of the substituted non-magnetic cations with different valences in the structural and magnetic properties was studied. X-ray diffraction and field-emission electron scanning microscope techniques were used to study the crystal structure and morphology. Magnetization curves in fields up to 10 kOe and in temperature range from 80 K to 570 K were measured by means of a vibrating sample magnetometer. Saturation magnetization as a function of temperature of the two samples was analyzed based on the molecular-field theory from that models for site occupancy and valence states of cations in the crystal structures were derived.

Photocatalytic Activity of Bismuth Ferrite Nanoparticles Synthesized via Sol-Gel Route

2019 ◽  
Vol 233 (5) ◽  
pp. 595-607 ◽  
Author(s):  
Mohsin Siddique ◽  
Noor Muhammad Khan ◽  
Muhammad Saeed
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Irradiation Time ◽  
Bismuth Ferrite ◽  
Sol Gel ◽  
Reaction System ◽  
Light Conditions ◽  
X Ray Diffraction ◽  
Light Region ◽  
Gel Technique

Abstract Nanosized, magnetically separable bismuth ferrite (BFO) nanoparticles, pertaining a crystallite size in the range of 14–15 nm were prepared via facile sol-gel technique. The product was characterized by scanning electron microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. The product was explored for the photocatalytic mineralization of rhodamine B (RB) dye in aqueous medium. The effect of different investigational parameters such as amount of photocatalyst, initial dye concentration and irradiation time on the photocatalytic degradation of RB was studied. The results reveal that the catalyst shows good degrading ability under normal pH and visible light conditions. BFO nanoparticles demonstrated a strong absorption ability in the visible-light region, which lead to efficient photocatalytic degradation of RB dye The reaction system was heterogeneous in nature in which the catalyst can be separated by a normal magnet.

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