Preparation and Damping Capacities of the NiTiSMA/FC Composites

2010 ◽  
Vol 97-101 ◽  
pp. 1601-1606 ◽  
Author(s):  
Qing Suo Liu ◽  
Cui Min Lu ◽  
Xu Ma ◽  
X.M. Lu ◽  
X.Y. Gao
Keyword(s):  
Sol Gel ◽  
Ferroelectric Ceramics ◽  
Niti Shape Memory Alloy ◽  
X Ray Diffraction ◽  
Dynamic Mechanical Analyzer ◽  
Pure Perovskite Structure ◽  
X Ray ◽  
Ceramic Film ◽  
Better Than

NiTiSMA/FC composites have been prepared by depositing ferroelectric ceramics films on NiTi shape memory alloy substrate with the sol-gel method. Heterojunction structure of the composites has been characterized by using X-ray diffraction and scanning electron microscope. The differences of the damping capacities between NiTiSMA/FC composites and NiTiSMA substrates have been tested by the Dynamic Mechanical Analyzer. The results show pure perovskite structure could be obtained in the FC films part of NiTiSMA/FC composites sintered at 650oC. The transitional TiO2 layer produced in-situ by the oxidation of the surface of the NiTiSMA substrate improves the combined function between the ceramic film and NiTiSMA substrate. When the temperature is lower than 20oC, the tanδ of NiTiSMA/FC composites is stabilized at 3.5%, the vibration frequencies (within 0.33-10Hz) have a small effect on damping capacities. Within the temperature of 20-40oC, there is a tanδ peak up to 5.0%.The damping capacities of NiTiSMA/FC composites are better than the pure NiTiSMA materials.

Effects of Glass Elements on the Structural Evolution ofin situGrown Ferroelectric Perovskite Crystals in Sol-gel Derived Glass-ceramics

1997 ◽  
Vol 12 (4) ◽  
pp. 1131-1140 ◽  
Author(s):  
Kui Yao ◽  
Weiguang Zhu ◽  
Liangying Zhang ◽  
Xi Yao
Keyword(s):  
Crystallization Process ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Structural Evolution ◽  
Dielectric Measurements ◽  
X Ray Diffraction ◽  
Process Change ◽  
X Ray ◽  
Ferroelectric Perovskite

Several ABO3perovskite ferroelectric crystals, PbTiO3, Pb(Zr, Ti)O3, and BaTiO3have beenin situgrown from amorphous gels with glass elements, and the structural evolution has been systematically investigated using x-ray diffraction (XRD), infrared spectra (IR), differential thermal analysis (DTA), thermogravimetric analysis (TGA), and dielectric measurements. It is found that in the Si-contained glass-ceramic systems, Si and B glass elements are incorporated into the crystalline structures, resulting in the variation of the crystallization process, change of lattice constant, and dielectric properties. Some metastable phases expressed by a general formula AxByGzOw(A = Pb and Ba; B = Zr and Ti; G for glass elements, especially for Si) have been observed and discussed.

Sol–gel preparation of V2O5 sheets and their lithium storage behaviors studied by electrochemical and in-situ X-ray diffraction techniques

2014 ◽  
Vol 40 (4) ◽  
pp. 6115-6125 ◽  
Author(s):  
Lianyi Shao ◽  
Kaiqiang Wu ◽  
Xiaoting Lin ◽  
Miao Shui ◽  
Rui Ma ◽  
...  
Keyword(s):  
Sol Gel ◽  
X Ray Diffraction ◽  
Lithium Storage ◽  
X Ray ◽  
Gel Preparation

scholarly journals Efficiency of TiO2 catalyst supported by modified waste fly ash during photodegradation of RR45 dye

2019 ◽  
Vol 26 (1) ◽  
pp. 292-300 ◽  
Author(s):  
Vanja Gilja ◽  
Zvonimir Katančić ◽  
Ljerka Kratofil Krehula ◽  
Vilko Mandić ◽  
Zlata Hrnjak-Murgić
Keyword(s):  
Fly Ash ◽  
Gas Adsorption ◽  
Sol Gel ◽  
Efficiency Evaluation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sol Gel Synthesis ◽  
Adsorption Desorption

AbstractThe waste fly ash (FA) material was subjected to chemical treatment with HCl at elevated temperature for a different time to modify its porosity. Modified FA particles with highest surface area and pore volume were further used as a support for TiO2 catalyst during FA/TiO2 nanocomposite preparation. The nanocomposite photocatalysts were obtained by in situ sol–gel synthesis of titanium dioxide in the presence of FA particles. To perform accurate characterization of modified FA and FA/TiO2 nanocomposite photocatalysts, gas adsorption-desorption analysis, X-ray diffraction, scanning electron microscopy, UV/Vis and Infrared spectroscopy were used. Efficiency evaluation of the synthesized FA/TiO2 nanocomposites was performed by following the removal of Reactive Red 45 (RR45) azo dye during photocatalytic treatment under the UV-A irradiation. Photocatalysis has been carried out up to five cycles with the same catalysts to investigate their stability and the possible reuse. The FA/TiO2 photocatalyst showed very good photocatalytic activity and stability even after the fifth cycles. The obtained results show that successfully modified waste fly ash can be used as very good TiO2 support.

Sol–Gel Synthesis and in Situ X-ray Diffraction Study of Li3Nd3W2O12 as a Lithium Container

2018 ◽  
Vol 10 (15) ◽  
pp. 12716-12721 ◽  
Author(s):  
Minghe Luo ◽  
Haoxiang Yu ◽  
Xing Cheng ◽  
Wuquan Ye ◽  
Haojie Zhu ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sol Gel Synthesis

scholarly journals Preparation of Stellerite Loading Titanium Dioxide Photocatalyst and Its Catalytic Performance on Methyl Orange

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Hua Chen ◽  
Jianhua Wang ◽  
Huajun Wang ◽  
Fei Yang ◽  
Jia-nan Zhou ◽  
...  
Keyword(s):  
Surface Area ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
Photocatalytic Ability ◽  
X Ray ◽  
Composite Photocatalysts ◽  
Ft Ir ◽  
Better Than

TiO2/stellerite composite photocatalysts were prepared by dispersing TiO2 onto the surface of HCl, NaOH, or NaCl treated stellerite using a sol-gel method. The materials were characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FT-IR), BET surface area analysis, and X-ray diffraction (XRD). HCl and NaCl modification result in the promotion of the pore formation at the stellerite surfaces and induced the microscopic changes, while the surface morphology and structure of the stellerite were almost ruined by NaOH modification. Supported TiO2 calcinated at 200°C presented anatase structure. The photocatalytic degradation activities of TiO2 loaded HCl and NaCl modified stellerite were better than that of natural stellerite, accompanied with increasing specific surface area. On the contrary, NaOH modification induced the loss of photocatalytic ability of composite due to the generation of silicates.

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.

Spectroscopic evidence of successful in situ insertion of sol–gel silica in a poly(3-hydroxybutyrate) matrix

2020 ◽  
pp. 089270572093593
Author(s):  
Anna Lecticia Martinez Martinez Toledo ◽  
Elton Jorge da Rocha Rodrigues ◽  
Maxwell de Paula Cavalcante ◽  
José Carlos Dutra Filho ◽  
Maria Inês Bruno Tavares
Keyword(s):  
Sol Gel ◽  
Polymer Chains ◽  
Nonlinear Dependence ◽  
X Ray Diffraction ◽  
Crystallinity Degree ◽  
X Ray ◽  
X Ray Scattering ◽  
Different Levels ◽  
Inorganic Structure

Silica-based (SiO2) poly(3-hydroxybutyrate) (PHB) nanocomposites were obtained via an in situ sol–gel route in three distinct particle concentrations (1, 5, and 7.5% by weight of PHB). The polymer hybrids formed were analyzed via wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), Fourier transform infrared (FTIR) spectroscopy, and time-domain nuclear magnetic resonance relaxometry (TD-NMR). The SiO2 inorganic structure displayed surface fractal features at low concentration (1 wt%) and denser agglomerates at higher concentrations (5 and 7.5 wt%). FTIR and SAXS results confirmed the formation of the inorganic matrix amid the polymer chains with different levels of distribution and organization. WAXD and TD-NMR results suggested the SiO2 influence on the PHB crystallinity degree, which was reflected on the polymer’s molecular dynamics with a nonlinear dependence of particles concentration in the PHB matrix.

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.

Sign in / Sign up

Export Citation Format

Share Document