Dissertation > Excellent graduate degree dissertation topics show

Spark Plasma Sintering of BaTiO3 Based Composite Ceramics

Author: SuShaoHua
Tutor: WuYongJun
School: Zhejiang University
Course: Materials Science
Keywords: Composite ceramics Barium titanate Spark Plasma Sintering The dielectric properties
CLC: TQ174.756
Type: Master's thesis
Year: 2011
Downloads: 43
Quote: 0
Read: Download Dissertation

Abstract


Electronic ceramics with high dielectric constant and low dielectric loss has a wide application in device miniaturization. This thesis spark plasma sintering method BaTiO3-based composite ceramics microstructure and dielectric properties. According to the basic law of the non-homogeneous composite material, the use of advanced spark plasma sintering method, and a new system to explore the complex phase giant dielectric constant material. The following main conclusions: prepared by spark plasma sintering dense (1-x) BaZr0.2Ti0.8O3/xCaCu3Ti4O12 ((1-x) BZT / xCCTO) composite ceramics. X-ray diffraction (XRD) and scanning electron microscopy analysis showed that its main by BaZr0.2Ti0.8O3 and CaCu3Ti4O12 of phase composition. Obtained within the range of 150-550 K for x = 0.9 component a wide giant the permittivity platform (-4000), this is a low-temperature ferroelectric BaZr0.2Ti0.8O3 peak and the CaCu3Ti4O12 high temperature dielectric relaxation jointly The results of the competition. The low-temperature dielectric relaxation comply with the Debye equation, follow the Arrhenius equation. The experimental values ??of the dielectric constant of the composite material with the same trend as the Maxwell-Garnet theory of value, can be explained by the interfacial polarization theory. The use of spark plasma sintering method dense (1-x) Ba0.4Sr0.6TiO3/xCaCu3Ti4O12 ((1-x) BST / xCCTO) composite ceramics. X-ray diffraction and micro-structural analysis results show that no third phase formation. Obtained in the range of 200-400 K the wide giant dielectric constant the platform (-2000), which is the Ba0.4Sr0.6TiO3 low temperature ferroelectric peak CaCu3Ti4O12 the high temperature dielectric relaxation jointly result of competition. Broaden the dielectric constant of platform and low dielectric loss at room temperature, so that the composite material has good application prospects. The dielectric constant of the composite from the experimental values ??agree to the Maxwell-Garnet theory of value, in line with the theory of interfacial polarization. The use of spark plasma sintering method has been the dense BaZr0.2Ti0.8O3 / carbon nanotubes (BZT / XCNT) composite ceramics can be confirmed by scanning electron micrographs. Add CNT greatly improve the dielectric constant of the BZT, the multiphase ceramics in the range of 250-400 K memory in Ideal width permittivity platform, its dielectric constant as high as 200,000 or more, while the dielectric loss is also low. The presence of multiphase ceramics diffuse phase transition, can be proved by the modified Curie-Weiss law. CNT and BZT within the ceramic composed of a large number of micro-capacitor led to the giant dielectric effect, interface effect and seepage effects also contribute to the giant dielectric effect.

Related Dissertations

  1. The Study of Piezoelectric Properties on BaTiO3 Based Lead-free Piezoelectric Ceramics,TM282
  2. Study on Microwave Dielectric Properties of Edible Vegetable Oil,TS221
  3. Preparation and Tribological Properties of TZ3Y20A-SrSO4 Ceramic Matrix Composites,TB332
  4. Study on Composites Ceramics of Potential-Sensible Storage for Solar Energy,TQ174.75
  5. Bismuth layered piezoelectric ceramics ions replace Modification,TM282
  6. Low H_cLiZn dielectric properties of ferrite,TM277
  7. Graphene oxide, niobium oxide nanosheets self-assembly and synthesis of ultrafine barium titanate powder,TB383.1
  8. Properties of Multi-component ZnO Varistor,TM54
  9. SiCp (Cu) / Fe Composites Preparation and Properties,TB33
  10. Boron nitride fiber reinforced ceramic matrix composites through the waves and Properties,TB332
  11. Modification and Co-firing with Copper Electrode of BiNbO4 and ZnTiO3 Microwave Dielectric Ceramic,TQ174.1
  12. Mechanism and Preparation of Cordierite Powder Synthesized by Microemulsion-Sol Gel Technique,TB383.3
  13. Properties of UHMWPE Fiber Reinforced Composites,TB332
  14. Preparation and Characterization of the Composite with Discontinuous NiTi SMA Thin Film,TB383.2
  15. Blade fuse base material preparation and co-fired with fuse unit study,TM563
  16. NBT-KBT-100x Preparation and characterization of piezoelectric thin,TM22
  17. The glass-ceramics for LTCC Preparation and Properties,TQ171.733
  18. Field induced nano hybrid polyimide dielectric properties and microstructure of,TB383.1
  19. PP / MMT nanocomposites crystal morphology and dielectric properties of,TB383.1
  20. Research on Preparation and Property of Glass Binder for Thick-film Metallization,TG492

CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Ceramics > Industrial ceramic > Electronic industrial ceramics
© 2012 www.DissertationTopic.Net  Mobile