Study of Structural and Electrical Properties of Conventional Furnace and Microwave-Sintered BaZr^sub 0.10^Ti^sub 0.90^O^sub 3^ Ceramics

Structural, dielectric, piezoelectric, and ferroelectric properties of Zirconium-doped barium titanate (...) ceramics prepared by microwave (MWS) and conventional (CS) sintering process are compared. X-ray diffraction and Raman spectroscopy indicate clearly the structural changes and confirm the eff...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the American Ceramic Society 2009-02, Vol.92 (2), p.416
Main Authors: Mahajan, Sandeep, Thakur, Om P, Bhattacharya, Dilip K, Sreenivas, Kondapudy
Format: Article
Language:English
Subjects:
Ceramic sintering
Ceramics
Dielectric properties
High temperature
Spectrum analysis
Zirconium
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Structural, dielectric, piezoelectric, and ferroelectric properties of Zirconium-doped barium titanate (...) ceramics prepared by microwave (MWS) and conventional (CS) sintering process are compared. X-ray diffraction and Raman spectroscopy indicate clearly the structural changes and confirm the effective diffusion of zirconium with the MWS technique to form BZT. Scanning electron microscopy reveals a fine grain, and a dense microstructure in the MWS ceramics processed under 4 h of cycle time (including heating, cooling, and holding time) in comparison with CS requiring 22 h. At room temperature the microwave sintered samples exhibit improved electrical properties exhibiting higher resistivity, higher dielectric constant, a lower dielectric loss, and a reduced dependence on frequency. Impedance and electric modulus spectroscopy analysis in the frequency range (40 Hz-1 MHz) and high-temperature range (573-873 K) suggests two relaxation processes attributed to bulk and grain boundary effects in the impedance plots for the both MWS and CS ceramics. The microwave-sintered BZT ceramics are found to be more attractive for room temperature device applications with improved properties, however, at higher temperatures they tend to degrade in comparison with the CS ceramics. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0002-7820
1551-2916