Dissertation > Excellent graduate degree dissertation topics show

Doping Modification of Lead-free Capacitor Ceramics

Author: XuShiGuo
Tutor: QuYuanFang
School: Tianjin University
Course: Materials Science
Keywords: Lead-free Perovskite structure Doping modification Dielectric properties
CLC: TQ174.1
Type: PhD thesis
Year: 2011
Downloads: 54
Quote: 0
Read: Download Dissertation

Abstract


This article Lead capacitor ceramic dielectric material having a perovskite structure (BaSr) (SnTi) O 3 for the study, by doping its modified analysis crystals doped material after structure, morphology, and dielectric properties, to explore a ceramic dielectric material having a high dielectric constant, low dielectric constant temperature change rate. Main contents include: Research the Bi 3 Na and Mg 2 (Ba 0.68 Sr 0.32 ) (Ti 0.99 Sn 0.01 ) O 3 ceramic dielectric properties. The Bi 3 doped ceramic sample Curie peak (the ε max reduces significantly increased dielectric loss. Containing Bi 3 (Ba 0.68 Sr 0.311 Bi 0.006 ) (Ti 0.99 Sn 0.01 ) O after 3 ceramic the Mg 2 and Na doping modification: Mg 2 doped ceramic specimen referral significantly reduce the dielectric constant, the dielectric constant temperature coefficient is improved; Na doped ceramic sample rhombohedral lattice distortion, the the Curie peaks (ε max reduce , dielectric loss has been markedly improved. Subsequently, the the containing of Bi 3 and Na the (Ba0.677Sr 0.311 of Bi 0.006 ) Na 0.006 (Ti 0.99 the Sn 0.01 ) the O 3 ceramic Mg 2 doping modification, the study found: With the of Mg 2 content increased from 0 to 2.0mol%, the ceramic specimen Curie peak (ε max reduce Curie temperature (Tc) is moved towards low; When Mg 2 content of greater than 2.0mol%, the the ceramic specimens Curie peak (ε max is only slightly reduced, door inside temperature (Tc) is almost no movement; When Mg 2 content of greater than 0.5 mol%, the ceramic specimens rhombohedral lattice distortion disappears, so that the dielectric loss of the low-temperature region is improved. explore Y 2 O 3 -doped and the second doped (Ba 0.670 Sr 0.311 ) Bi 0.006 Mg 0.010 ) (Ti 0.99 Sn 0.01 ) O 3 ceramic dielectric properties two doping ways are the dielectric constant of the ceramic sample Curie peak (ε max increases, the dielectric constant of the ceramic sample showed significant diffuse phase transition characteristics. two Doping a certain degree of the influence of the dielectric loss of the ceramic specimens different: Y 2 O 3 a doping modification, the ceramic sample in the high temperature the District of dielectric loss and Y of 2 O 3 doped amount related; Y 2 O 3 secondary doped heteroaryl modified when the dielectric loss of the ceramic sample in the high temperature zone to be significantly improved, and does not vary with Y change O 3 content changes, and then, by fractional Synthesis of (Ba 0.68 Sr 0.311 Bi 0.006 ) (Ti 0.99 Sn 0.01 ) O 3 - (Bi 0.5 Na 0.5 ) TiO 3 ceramics. ceramic sample no obvious permittivity Curie peak (ε max , is a mixture of: a variety of different compounds from the Curie temperature (Tc) assembly. ceramic sample in the -25 ℃ 85 ° C temperature range, preferably the dielectric constant of the temperature change rate (TCC). to 80 wt% (BA 0.68 Sr Bi 0.311 0.006 < / sub>) (Ti 0.99 Sn 0.01 ) O 3 - 20wt.% (Bi 0.5 Na 0.5 ) TiO 3 ceramic specimens the Y- 2 O 3 secondary doping modification, the study found that: Y < sub> 2 O 3 doping amount of 0.5mol%, the ceramic specimens exhibit a high dielectric constant, about 3000 or so.

Related Dissertations

  1. First- principles calculations of doped anatase titanium dioxide photocatalytic properties,O643.36
  2. Preparation and Properties of lead-free glass powder,TQ171.6
  3. Modification of Thermosetting Resins by High Performance Liquid Crystalline Epoxy Resin,TQ323.5
  4. Microwave Dielectric Resonator Ceramics of High-Q Value for the 3G Mobile Communication Base Stations,TQ174.756
  5. Processing and Property Study of Mg2TiO4 -based Microwave Dielectric Ceramics,TN04
  6. LTCC glass additives and casting technology research,TN405
  7. Boron nitride fiber reinforced ceramic matrix composites through the waves and Properties,TB332
  8. High thermal conductivity epoxy composites and Research,TB332
  9. Researches on Properties of Nanoparticles Composite Lead-free Solders and Its Micro-joined Joint,TB383.1
  10. Torsion Fatigue and Multiaxial Ratcheting Fatigue of Lead-free Solder,TG425
  11. Influence of Cooling Rates on Microstructure and Properties of Zn-4Al-3Mg Alloy,TG146.13
  12. Properties of 1-3 Polymer/Cement Based Piezoelectric Composites,TB332
  13. Structure and Properties of Bismuth System Low Melting Electronic Glasses,TQ171.1
  14. Research on Electrical and Magnetic Properties of Composite Garnet Ferrite Sintered at Low-temperature,TQ138.11
  15. Preparation and Characterization of the KNN-based Lead-free Piezoelectric Ceramics,TM282
  16. Preparation of the Lead-free Silver Conducting Paste for Silicon Solar Cells,TM914.4
  17. Study on New Process to Improve Bonding Strength of the Inner Layer,TN41
  18. Research on Fiberhome Lead-Free Purchase Switching,F626
  19. Soldering Performance and IMC Growth Mechanism of SnAgCuNiBi Lead-free Solder,TG425
  20. Study on the Lead-free High Curie Temperature BaTiO3 Based Materials,TB302
  21. Research on Lead-free (Ba, Sr)TiO3 Based Ceramics,TB34

CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Basic theory
© 2012 www.DissertationTopic.Net  Mobile