scholarly journals PMN-PSMNT ceramics fabricated using the twin-crystal mixed co-firing method

2021 ◽  
Author(s):  
Guocui Bao ◽  
Dongliang Shi ◽  
Kun Li ◽  
Guang Yang ◽  
Bijun Fang ◽  
...  
Keyword(s):  
Ferroelectric Properties ◽  
Relative Dielectric Permittivity ◽  
X Ray Diffraction ◽  
Pure Perovskite Structure ◽  
Twin Crystal ◽  
One Step ◽  
Average Size ◽  
Precursor Powders ◽  
Firing Method ◽  
Microscopy Images

Abstract (1-w)[Pb(Mg1/3Nb2/3)0.67Ti0.33O3]-w[Pb1 − 1.5xSmx(Mg1/3Nb2/3)yTi1−yO3] ((1-w)PMN-wPSMN-PT) piezoelectric ceramics were prepared using the newly proposed twin-crystal mixed co-firing method in which two pre-sintered precursor powders were mixed and co-fired with designated ratios (w = 0.3, 0.4, 0.5, 0.6). X-ray diffraction results show that all the samples presented a pure perovskite structure. The grains were closely packed and the average size was ~ 5.18 µm from the observations of scanning electron microscopy images, giving the high density of ceramics to be 97.8% of the theoretical one. The piezoelectric, dielectric, and ferroelectric properties of the ceramic samples have been investigated systematically. It was found that the performance of ceramics was significantly enhanced when compared to the ceramics fabricated using the conventional one-step approach. Outstanding piezoelectric coefficient d33 of 1103 pC/N and relative dielectric permittivity εr of 9154 could be achieved for the ceramics with w = 0.5.

scholarly journals Synthesis and Characterization of La0.8Sr0.2Ga0.8Mg0.2O3-δ Nano-Particle by Aerosol Plasma Pyrolysis

2010 ◽  
Vol 445 ◽  
pp. 82-85
Author(s):  
Kenichi Myoujin ◽  
Araki Toriyama ◽  
Takayuki Kodera ◽  
Takashi Ogihara
Keyword(s):  
Metal Nitrate ◽  
Nano Particle ◽  
X Ray Diffraction ◽  
Bimodal Size Distribution ◽  
Primary Particles ◽  
Plasma Pyrolysis ◽  
Xrd Patterns ◽  
Average Size ◽  
Precursor Powders

Spherical La0.8Sr0.2Ga0.8Mg0.2O3-δ (LSGM) precursor powders were synthesized by aerosol plasma pyrolysis using an aqueous solution of metal nitrate. As-prepared powders obtained by this method were found to have a spherical morphology with a bimodal size distribution of nanosized (primary) and submicron-sized (secondary) particles. The average size of the primary particles was less than 100 nm. X-ray diffraction (XRD) patterns showed that as-prepared powders crystallized to LSGM and other phases. XRD revealed that LSGM pellets were crystallized to a perovskite structure after sintering at 1300 °C for 10 h.

Recovering Nano-Sized SnO2 from Electronic Wastes by Ultrasonic-Assisted Electrochemical Method

2012 ◽  
Vol 550-553 ◽  
pp. 2024-2028
Author(s):  
Jian Jun Shi ◽  
Sheng Wang ◽  
Ting Ting He ◽  
Dao Yuan Zhou
Keyword(s):  
Electrochemical Method ◽  
Room Temperature ◽  
Tin Dioxide ◽  
High Energy ◽  
X Ray Diffraction ◽  
Environment Friendly ◽  
X Ray ◽  
Ultrasonic Assisted ◽  
One Step ◽  
Average Size

Tin dioxide nanoparticles were directly one-step recovered from electronic wastes using ultrasonic-assisted electrochemical method. The products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), which indicated that the average size of tetragonal SnO2 is 100 nm. The experiment parameters, such as the concentration of electrolyte, electrolysis current, reaction time and electrode distance, were also discussed. The proposed method is high energy efficient, non-toxic and environment-friendly, and suitable for the recovering of electronic wastes under the controllable reaction condition at room temperature.

Effect of Sintering Temperature on Structure and Electric Properties of (Ba0.96Ca0.04)(Zr0.05Ti0.95)O3 Ceramics

2015 ◽  
Vol 655 ◽  
pp. 141-146
Author(s):  
Xin Guan ◽  
Xiang Yun Deng ◽  
Jian Hao ◽  
Guang Hao Sun ◽  
Chuang Jun Huang
Keyword(s):  
Dielectric Constant ◽  
Sintering Temperature ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Calcium Titanate ◽  
Ferroelectric Ceramics ◽  
X Ray Diffraction ◽  
Pure Perovskite Structure ◽  
Maximum Dielectric Constant ◽  
Gel Technique

Barium calcium titanate (Ba0.96Ca0.04)(Zr0.05Ti0.95)O3 ferroelectric ceramics were prepared by sol–gel technique. The ceramics were sintering at 1290°C-1370°C. X-ray diffraction was employed to investigate the microstructure, and the surface topography was investigated by SEM graphs. The dielectric constant vs temperature was measured by Temperature dielectric spectrometer, and TF Analyzer 2000 measured the ferroelectric properties. It can be found that all the ceramics show pure perovskite structure suggesting that solid solution were formed. SEM showed that the samples uniform in grain size at 1330 °C. Our study revealed that when the sintering temperature is 1330 °C the maximum dielectric constant was 29,600, the maximum piezoelectric coefficient d33 could reach 399pm/V and the remanent polarization (Pr) was 8.3 μc/cm2, respectively.

An Investigation of Solvent Effect on Rhombohedral/Monoclinic/Tetragonal Phase Properties of Pb(Zr0.53Ti0.47)O3 Nanoparticles Prepared via Sol-Gel Method

2013 ◽  
Vol 829 ◽  
pp. 698-702 ◽  
Author(s):  
Amid Shakeri ◽  
Hossein Abdizadeh ◽  
Mohammad Reza Golobostanfard
Keyword(s):  
Acetic Acid ◽  
Lead Zirconate Titanate ◽  
Monoclinic Phase ◽  
Volume Fraction ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Domain Size ◽  
X Ray Diffraction ◽  
Pure Perovskite Structure ◽  
X Ray

The highest piezoelectric and ferroelectric properties of lead zirconate titanate (PZT) occur in vicinity of morphotropic phase boundary (MPB). In MPB, crystalline phase ratios play a crucial role in determining the dielectric properties. In this paper, PZT nanoparticles were synthesized by a modified sol gel procedure and the effects of different solvents of methanol, ethanol, 1-propanol, and acetic acid on tetragonal, rhombohedral, and monoclinic phase ratios near the Pb (Zr0.53Ti0.47)O3 were investigated. The X-ray diffraction results show the formation of almost pure perovskite structure in all samples. The volume fraction of tetragonal and rhombohedral phases, lattice constants, and lattice distortion were measured from the X-ray diffraction and Raman spectroscopic analysis for each solvent. Also, the domain size was compared between the solvents. A trace amount of monoclinic phase could be detected by Raman spectroscopy. The results show that acetic acid is the most appropriate solvent for synthesizing of PZT nanoparticles in which the tetragonal lattice parameters are ct=4.16 Ǻ and at=4.02 Ǻ with a distortion of 3%. The tetragonal volume fraction is estimated about 77%. The particle size and degree of agglomeration were measured according to field emission electron microscopy and indicates that 70 nm particles were formed for acid-based sample.

Hyperthermia Effect on Phantom of Breast Carcinoma Tissue Induced by Mn3O4 Nanoparticles Synthesized by One-Step Spray Pyrolysis Method

2020 ◽  
Vol 853 ◽  
pp. 56-60
Author(s):  
Alexa Gaona-Esquivel ◽  
Diana S. Hernández-Manzo ◽  
Perla J. Sánchez-Trujillo ◽  
Oscar E. Cigarroa-Mayorga ◽  
Miguel Meléndez-Lira
Keyword(s):  
Spray Pyrolysis ◽  
Single Phase ◽  
Average Diameter ◽  
Spray Pyrolysis Method ◽  
X Ray Diffraction ◽  
Manganese Oxide Nanoparticles ◽  
X Ray ◽  
Pyrolysis Method ◽  
One Step ◽  
Microscopy Images

In this work, the synthesis of manganese oxide nanoparticles was achieved by one-step spray pyrolysis method. The nanoparticles were synthesized just from MnCl2 aqueous solution. The solution was nebulized to a Si substrate placed at 400 °C for 1, 5 10 and 20 min and transported at a 0.1 L /min rate in a Nitrogen flux. The X-ray diffraction confirms tetragonal Mn3O4 as the unique phase in the whole sample. The scanning electron microscopy images proved the achievement of irregular nanoparticles with an average diameter of 280 nm experimentally determined by dynamic light scattering. Energy dispersive X-ray and Raman spectroscopy confirmed that the nanoparticles were obtained with Mn3O4 single-phase and the employed methodology prevented any contamination. The nanoparticles proved to induce temperature enhancement on artificial breast tissue by exposition to microwave radiation by achieving an increase in temperature around 8 %.

scholarly journals An Eco-Friendly Method of BaTiO3 Nanoparticle Synthesis Using Coconut Water

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Maria de Andrade Gomes ◽  
Lucas Gonçalves Magalhães ◽  
Alexandre Rocha Paschoal ◽  
Zélia Soares Macedo ◽  
Álvaro Silva Lima ◽  
...  
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Nanoparticle Synthesis ◽  
Ftir Spectra ◽  
Coconut Water ◽  
Water Volume ◽  
X Ray Diffraction ◽  
X Ray ◽  
Average Size ◽  
Microscopy Images

BaTiO3 nanoparticles were successfully synthesized by a new coconut water-based sol–gel method using Ba(CH3COO)2 and TiCl3 as the starting salts. The influence of the amount of coconut water and calcination conditions on the barium titanate crystallization was investigated. The resulting nanoparticles were characterized by thermogravimetric and differential thermal analysis, X-ray diffraction, scanning electron microscopy, and Raman and Fourier transform infrared (FTIR) spectroscopies. The ferroelectric tetragonal single phase of BaTiO3 was obtained in samples prepared with a ratio of coconut water volume (mL)/BaTiO3 mass (g) of 25 : 2 and 30 : 2, calcined at 1100°C, which was confirmed by XRD measurements. Crystallites with an average size of about 31 nm for both samples were obtained, and microscopy images revealed the presence of particles in the range of 40 to 60 nm. Raman and FTIR spectra confirmed the dominant tetragonal phase of BaTiO3, meanwhile traces of BaCO3 were identified in FTIR spectra.

Dielectric and Ferroelectric Properties of Bi-Doped BaTiO3 Ceramics

2007 ◽  
Vol 334-335 ◽  
pp. 977-980 ◽  
Author(s):  
Xiang Ping Jiang ◽  
M. Zeng ◽  
K.W. Kowk ◽  
Helen Lai Wah Chan
Keyword(s):  
Perovskite Phase ◽  
Ferroelectric Properties ◽  
Relaxor Ferroelectric ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Pure Perovskite Structure ◽  
Dielectric Relaxation Process ◽  
X Ray ◽  
Dielectric Peak ◽  
A Site

Barium titanate with A-site substituted by various amount of bismuth oxide (Ba1-x BixTiO3, abbreviated as BBT, x=0.05, 0.1, 0.15) were prepared by solid-state reaction. The effect of bismuth substitution on crystallographic phase, dielectric and ferroelectric properties was studied. The X-ray diffraction shows that the samples were crystallized into pure perovskite structure when x=0.05 and 0.1, while for x=0.15 sample, second phase appeared in the dominant perovskite phase. The temperature dependence of dielectric permittivity of the ceramics was investigated and the evolution from normal ferroelectrics to relaxor ferroelectric sates was observed. In the range 0≤x≤0.1, the temperature of dielectric peak Tm is independence of the frequency, indicating the normal ferroelectrics behavior. At x=0.15, dielectric relaxation process with a broadening distribution of the permittivity dielectric is observed.

Preparation and Characterization of Monodispersed BaTiO3 Nanocrystals Using One-Step Solvothermal Method

2011 ◽  
Vol 412 ◽  
pp. 82-85
Author(s):  
Hui Zhang ◽  
Xiao Hui Wang ◽  
Zhi Bin Tian ◽  
Cai Fu Zhong ◽  
Yi Chi Zhang ◽  
...  
Keyword(s):  
Solvothermal Method ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
Dta Analysis ◽  
One Step ◽  
Ft Ir ◽  
Average Size ◽  
Hydrolysis Of

A convenient one-step solvothermal method has been developed to synthesize monodispersed barium titanate nanocrystals with an average size of 5 nm. The key point of this method is the controlling of hydrolysis of Ti (OC4H9)4with Diethylene glycol (DEG). The as-prepared BaTiO3nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), FT-IR and TG/DTA analysis. The monodispersed BaTiO3nanoparticles obtained by this method have an average size of 5 nm with a narrow size distribution and a lattice tetragonality of 1.0069, which is promising for the ferroelectric science and its industry application.

scholarly journals Facile Green Synthetic Route to the Zinc Oxide (ZnONPs) Nanoparticles: Effect on Green Peach Aphid and Antibacterial Activity

2017 ◽  
Vol 9 (2) ◽  
pp. 131 ◽  
Author(s):  
Alaa Y. Ghidan ◽  
Tawfiq M. Al-Antary ◽  
Nidá M. Salem ◽  
Akl M. Awwad
Keyword(s):  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Zinc Oxide Nanoparticles ◽  
Green Peach Aphid ◽  
Punica Granatum ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
One Step ◽  
Ft Ir ◽  
Average Size

In this study, zinc oxide nanoparticles (ZnONPs) were synthesized using Punica granatum peel extract in one–step reaction at room temperature. Zinc oxide nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), ultraviolet visible spectroscopy (UV-vis) and scanning electron microscopy (SEM). The UV-vis absorption spectrum shows an absorption band at 278 nm due to ZnO nanoparticles. XRD characterized the final product as highly crystalline ZnO with sizes in the range 10-40 nm. The SEM results reveal a presence of network of randomly oriented ZnO nanoplatelets with an average size of 40 nm and thicknesses of about 8 nm. This study determined the effect of zinc oxide nanoparticles on green peach aphid and antibacterial activity.

In Vitro Assessment of Hydroxyapatite Coating on the Surface of Additive Manufactured Ti6Al4V Scaffolds

2016 ◽  
Vol 879 ◽  
pp. 2444-2449 ◽  
Author(s):  
Ekaterina Chudinova ◽  
Maria Surmeneva ◽  
Andrey Koptioug ◽  
Irina V. Savintseva ◽  
Irina Selezneva ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Human Mesenchymal Stem Cells ◽  
Nanocrystalline Structure ◽  
X Ray Diffraction ◽  
Ha Coating ◽  
Magnetron Sputter Deposition ◽  
In Vitro Assessment ◽  
Average Size

Custom orthopedic and dental implants may be fabricated by additive manufacturing (AM), for example using electron beam melting technology. This study is focused on the modification of the surface of Ti6Al4V alloy coin-like scaffolds fabricated via AM technology (EBM®) by radio frequency (RF) magnetron sputter deposition of hydroxyapatite (HA) coating. The scaffolds with HA coating were characterized by Scanning Electron microscopy, X-ray diffraction. HA coating showed a nanocrystalline structure with the crystallites of an average size of 32±9 nm. The ability of the surface to support adhesion and the proliferation of human mesenchymal stem cells was studied using biological short-term tests in vitro. In according to in vitro assessment, thin HA coating stimulated the attachment and proliferation of cells. Human mesenchymal stem cells cultured on the HA-coated scaffold also formed mineralized nodules.

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