Dissertation > Excellent graduate degree dissertation topics show

Research on the Low-sintering Behavior of Microwave Dielectric ZnO-Nb2O5-TiO2 Ceramics

Author: ZhangLing
Tutor: JiangShengLin
School: Huazhong University of Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: LTCC ZnO-Nb2O5-xTiO2 ceramics doping sintering aids microwave properties
CLC: TQ174.1
Type: Master's thesis
Year: 2010
Downloads: 31
Quote: 0
Read: Download Dissertation

Abstract


The development of microwave technology is continuously pushing mobile communication equipments and portable terminal to micromation and modularization. Low Temperature Co-fired Ceramic （LTCC） technique is the best method to achieve the aim. To match the LTCC technique and the request of high frequency components, microwave dielectric ceramics are developing to low sintering temperature, high Qf values and lowτf values.ZnNb2O6 ceramic is an excellent microwave dielectric ceramic with high Qf value （83700 GHz）. However, it has low relative permittivity（25）, large negativeτf value（-56 ppm/℃） and high sintering temperature （1150℃） which stops it from sintering with low melting point electrode materials like Ag, Cu etc. For the above, in order to promote the relative permittivity and adjust theτf value, we added some amount of TiO2 to the ZnNb2O6 ceramic and found that ZnO-Nb2O5-2TiO2 ceramics could sinter at 1125℃withεr = 46.79, Qf = 13481 GHz,τf = 57.3 ppm /℃.Then, SnO2 and MnO2 was doped to modified the ceramic. The doping of SnO2 and MnO2 could inhibit the formation of the second phase, improve the Qf values of the ceramics in a certain range and lower theτf values. Also, MnO2 could lower the sintering temperature to 1060℃. The results showed that ZnO-Nb2O5-1.92TiO2-0.08SnO2 ceramics could sinter at 1125℃withεr = 47.84, Qf = 16533 GHz,τf = 23.4 ppm/℃and ZnO-Nb2O5 -1.91TiO2-0.08SnO2-0.01MnO2 ceramics sintered at 1060℃wthεr = 44.13, Qf = 17050 GHz,τf = 15.7 ppm /℃.At last, we used ZnO-B2O3 （1:1） and BaO-CuO-B2O3 （1:1:1） two types of glass to lower the sintering temperature, respectively. The result demonstrated that the effect of BaO-CuO-B2O3 glass on lowering the sintering temperature of ZnO-Nb2O5 -1.91TiO2-0.08SnO2-0.01MnO2 was much better than ZnO-B2O3 glass. With 4 wt.% ZnO-B2O3 glass doping, the ceramics could sinter at 930℃withεr = 41.2, Qf = 8120 GHz,τf = -18.9 ppm /℃; with 3 wt.% BaO-CuO-B2O3 glass addition, the ceramics could sinter at 860℃withεr = 41.2, Qf = 8120GHz,τf = -18.9 ppm /℃, and had good prospects in LTCC applications.

Related Dissertations

  1. Preparation and Photocatalytic Properties for Water Decomposition of Titanate Photocatalyst,O643.36
  2. The Study of Preparation and Photocatalytic Activity of TiO2 by Electrospinning,O614.411
  3. Study and Preparation of BaTiO3-based NTC Ceramic Thermistors,TQ174.1
  4. First- principles calculations of doped anatase titanium dioxide photocatalytic properties,O643.36
  5. Preparation of One-dimensional Nano TiO2 and Study on the Decolorization of Dyeing Wastewater,TB383.1
  6. First-Principles Studies of Cathode Material LiMO2 （M=Co, Ni, Mn） of Lithium Ion Batteries,TM912
  7. Iron, lanthanum -doped nano TiO \u003csub\u003e 2 \u003c/ sub\u003e Preparation and photocatalytic properties,O614.411
  8. Influence of Doping Effect on Zinc Oxide by First Principles Studies,O614.241
  9. Magnetocaloric Effect in Pure and Doped Magnetic Relaxor Ferroelectrics CdCr2S4,O482.5
  10. Porous MIn 2 S 4 (M = Zn, Cd) photocatalyst Preparation, Characterization and Photocatalytic Performance,O643.36
  11. Preparation and Surface Functionalization of Mg-doped ZnO Quantum Dots,O614.241
  12. First-Principle Studies of Cathode Materials LiFePO4 and Its Doped Systems for Lithium Ion Batteries,TM912
  13. Synthesis and Electrochemical Performances of New Lithium-ion Battery Cathode Materials Li3V2（PO4 ）3 and Li[NixLi1/3-2x/3 Mn 2/3-x/3)O2,TM912
  14. Supported Co-doped TiO 2 photocatalyst Preparation and Research,O643.36
  15. Doped Modification and Application of Titania Photocatalyst,O643.36
  16. Preparation and Properties of Crystalline Glaze for Low Temperature and Fast Firing,TQ174.65
  17. Research on Luminescence of Nanoporous Glass Composite Materials,TB383.1
  18. Design of High Frequency Balanced Filter Module Based on LTCC Technology,TN713
  19. Preparation of Zeolite Doping Nano-TiO2 and Research of the Photocatalytic Properties,TB383.1
  20. Preparation and Characterization of Doped BiFeO3 Nanocrystals,TB383.1
  21. Study on Low Temperature Sintered PSN-PZT Piezoelectric Ceramics,TM282

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