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January 28th, 2010

Influence of SiO2 Addition on the Dielectric Properties and Microstructure of (Ba0.96Ca0.04)(Ti0.85Zr0.15)O3 Ceramics

Published on January 28th, 2010 | By: pwray@ceramics.org

Volume 6 Issue 6, Pages 692 – 701


Ying-Chieh Lee, Chia-Wei Lin, Wei-Hua Lu, Wen-Jauh Chen, Wen-Hsi Lee
Online: Apr 17 2009 8:10PM

DOI: 10.1111/j.1744-7402.2009.02379.x


In this study, the effect of SiO2 doping on the
sintering behavior, microstructure, and dielectric properties of BaTiO3-based
ceramics was investigated. Silica was added to (Ba0.96Ca0.04)(Ti0.85Zr0.15)O3
(BCTZ) powder prepared using the solid-state method. SiO2-doped
BCTZ ceramics with a high density and a uniform grain size were
obtained and sintered at 1220°C in a reducing atmosphere. A second phase
(BaTiSiO5) existed in samples when SiO2
was added in excess of 1%. The amount of the second phases was observed
to increase as the number of SiO2 additives
increased. It was found that BCTZ ceramics sintered with SiO2
are helpful in reducing the sintering temperature for a typical thick
film and MLCC applications. However, there were disadvantageous effects
on the dielectric properties with mere addition of SiO2
addition (3% and 5%) due to higher formation of BaTiSiO5.
Doping with a small amount of silica can improve the sintering and
dielectric properties of BCTZ ceramics. In addition, to understand the
effect of the BaTiSiO5 phase on the dielectric
properties of BCTZ ceramics, the BaTiSiO5
composition was synthesized from individual BaCO3,
TiO2, and SiO2 powders
using conventional solid-state methods. X-ray diffraction results show
the presence of mainly the crystalline phase, BaTiSiO5,
in the sintered ceramics.


Online Access to Journal of Applied Ceramic Technology

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