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Study on Dielectric Relaxation Behavior of BiFeO3/Bi3.25La0.75 Ti3O12Film and Dielectric Properties of Ba(Zr0.15Ti0.85)O3 Ceramic

Author: ZhuWeiLi
Tutor: LiLiBen
School: Henan University of Science and Technology
Course: Condensed Matter Physics
Keywords: Dielectric BFO / BLT film BZT ceramics The Maxwell - wigner mechanism Dielectric relaxation Phase transition diffusion
CLC: O482.4
Type: Master's thesis
Year: 2011
Downloads: 56
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Abstract


A wide range of dielectric, different functions, a wide range of applications. BiFeO 3 (BFO) has a high ferroelectric Curie temperature (1100K) and high magnetic transition temperature (Nepal ear temperature 620K) with ferroelectric and magnetic double performance in multifunction device has potential applications, but the large leakage current limits their development and application. BaTiO 3 has a high dielectric constant, and almost no leakage, is the ideal material for capacitor. However, the higher the ferroelectric Curie temperature (120 ℃) ??and a sensitive dependence of the dielectric constant on temperature limit its application at room temperature. 1 Huangfeng Zhen et al. Using metal organic decomposition method (MOD) Pt / Ti / SiO 2 / Si substrate prepared BiFeO 3 (BFO) / Bi 3.25 La 0.75 Ti 3 O 12 (BLT) bilayer, found that BLT layer to improve the leakage current of the material, the more important is the relaxation behavior of the bilayer membrane presents a typical dielectric. Chapter II of this article the BFO film leakage of relaxor ferroelectrics BLT film the relaxor ferroelectrics leakage or leakage ferroelectrics, Maxwell - Wigner machine this behavior of the bilayer. The results show that the the BFO film relaxation characteristics significantly affect BFO / BLT film dielectric relaxation behavior. The theoretical results are in good agreement with the experimental results when the temperature is higher than 400K. Inferred the BLT film of polycrystalline orientation in the diffusion of the divalent iron ion causes this film appears in the polarity of the nano-micro-area of ??the disorganized and their relaxation characteristics at low temperatures is suppressed; the the BFO membrane polycrystalline orientation cause BFO film pole nano-micro area relaxation properties at high temperatures can be achieved. This conventional solid-state reaction prepared zirconium-doped barium titanate ceramics Ba (Zr the, Ti , 0.15 0.85 ) O 3 < / sub> (BZT). Its crystalline structure, morphology, and dielectric properties were measured and found BZT showed dielectric dispersion and relaxation characteristics; pure barium titanate ceramics prepared under the same conditions but without this feature. The fluctuation theory Smolenski ingredient explain the diffuse phase transition characteristics, combined with the Debye relaxation theory to analyze the relationship between the dielectric constant peak frequency, the theoretical results are in good agreement with the experimental results. At the same time the Arrhenius relationship study the BZT high temperature relaxation phenomena, pointed out that the high temperature relaxation may be caused relaxation by oxygen vacancies.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Electrical Properties
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