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Preparation of BaTiO3 Nanoparticles with Various Particle Sizes and Ferroelectric and Dielectric Properties of 0-3 Type BaTiO3/PVDF Piezoelectric Composite Materials

Author: MaoYanPing
Tutor: MaoShaoZuoï¼›XieZhaoXiong
School: Xiamen University
Course: Physical and chemical
Keywords: Nano piezoelectric composites Dielectric properties Size effect
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 446
Quote: 4
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Abstract


Ferroelectric materials are widely used as a functional material, has always been widespread concern. With the development of technology, ferroelectric component miniaturization and integration have become increasingly demanding, which further requires a ferroelectric material grain size decreases. When the grain size decreases, the ferroelectric ferroelectric whether it can remain a significant problem, the effect of this size has an important significance. Since barium titanate (BaTiO 3 ) crystal structure is simple and has a high dielectric constant, both in theory and practice of BaTiO 3 of the critical size makes sense. In this thesis, BaTiO 3 as a reinforcing material, piezoelectric polymer polyvinylidene fluoride (PVDF) as a matrix, with the preparation method of the piezoelectric composite material barium titanate nanoparticles size effect. Piezoelectric composite piezoelectric polymer both advantages of the piezoelectric ceramics and polymers, but also can exhibit new properties of composite materials, we further studied the piezoelectric composite piezoelectric, ferroelectric properties, and that BaTiO 3 and PVDF synergies reinforced composites ferroelectric and dielectric properties. First, we use Solvothermal with different particle sizes BaTiO 3 micro-nano particles by X-ray powder diffraction and scanning electron microscopy characterization found that the particle size distribution obtained several of BaTiO < sub> 3 powders are good dispersion, uniform particle size and purity BaTiO 3 . Through further heat-situ x-ray powder diffraction analysis, BaTiO 3 larger particles, the particles of the composition of the tetragonal phase, the more the higher the Curie temperature conclusions. We then affect product BaTiO 3 particle morphology Several factors were studied and found that the concentration of reactants, solvent polarity, the reaction temperature and the amount of surfactant on the reaction conditions such as the finally obtained BaTiO 3 particle size and dispersion have a certain impact. The prepared by solution mixing of different size BaTiO 3 micro-nano particles and PVDF composites even after further thermoforming, you get a different particle size BaTiO 3 The polymer-based composite sample particles. Our hot before and after BaTiO 3 particles were characterized by electron microscopy and found that pressing process BaTiO 3 particles did not grow up and still keep the original size. SEM cross section of the sample that the solution blending method can be BaTiO 3 particles uniformly dispersed in the PVDF piezoelectric composite. Measurements with different particle size BaTiO 3 particles hysteresis loops of samples and found the composite remnant polarization and the coercive field was significantly higher than the pure phase PVDF, and the remainder of the sample in the sample with the polarization BaTiO 3 of particles increases. Composite sample of remnant polarization and BaTiO 3 particle size showing a nearly linear relationship, which can be used S.Wada and others made the BaTiO 3 particles three theoretical models explained. We measured the 25nm of BaTiO 3 / PVDF nanocomposite ferroelectric hysteresis loops of samples, which may be due BaTiO 3 and PVDF synergies between, enhanced ferroelectric composites. Containing different size BaTiO 3 particles of the dielectric properties of samples were tested, each sample dielectric constant and dielectric loss increases with the frequency decreases with increasing temperature and increasing large. From dielectric spectroscopy and temperature spectra can see the obvious size effect, dielectric constant BaTiO 3 particle size of the same trend, when the composite material BaTiO 3 particles of 80 ~ 100nm, the maximum dielectric constant occurs.

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