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Piezoelectric Properties of BaTiO3 Nanofibers and Microwave Absorbing Properties of Leaf-like Fe-Co Alloy Nanoparticles

Author: WangFei
Tutor: MaFei；NiXia；QinYong
School: Lanzhou University
Course: Materials Physics and Chemistry
Keywords: Barium titanate nanofibers Sol-gel methods electrospinning Piezoelectricity Leaf-like Fe-Co alloy nanoparticles Composite materials Complex permittivity Complex permeability Microwave absorbing properties
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 80
Quote: 0
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Abstract


Traditional piezoelectric ceramic materials have high piezoelectric coefficient and electromechanical coupling coefficient. So they are widely used in the field of energy harvesting, sensing, driving, and frequency controlling. Because of a possibility of their more excellent piezoelectric properties compared to the traditional piezoelectric ceramic materials, nanomaterials can have wider applicationsBarium titanate (BaTiO3) nanofibers were synthesized by a simple and economical electrospinning method. The precursor was prepared by sol-gel methods. PVP which had high molecular weight was used to adjust the viscosity of the solution. The device was prepared with single BaTiO3 nanofiber. And then its piezoelectric property was studied.Ferromagnetic metal and alloy nanoparticles have attracted lots of attentions because of their high saturation magnetization, working frequency, complex permittivity and complex permeability compared with ferrites. Leaf-like Fe-Co alloy nanoparticles with large shape anisotropy can exceed Snoek’s limit and possess higher permeability in GHz frequency range. Hence this kind of leaf-like magnetic nanoparticles can be used as good microwave absorption materials in GHz frequency range.In this work. FexCo1-x(x=0.1～0.6) alloy nanoparticles with leaf-like shape were synthesized by liquid phase chemical reduction method and the selective absorption of the stabilizing agents (OH-). The composites with higher resistivity were prepared by mixing leaf-like magnetic nanopaiticles and paraffin wax. Dynamic magnetic and microwave absorption properties of the composites were studied systematically.

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