Effect of ZrO2-NiO on the Microstructure and Microwave Dielectric Properties of Complex Perovskite Ba(Zn1/3Ta2/3)O3

Title
Effect of ZrO2-NiO on the Microstructure and Microwave Dielectric Properties of Complex Perovskite Ba(Zn1/3Ta2/3)O3
Authors
강성우김태희신현정김성열최선희김주선
Keywords
BZT; Microwave; Dielectrics
Issue Date
2009-05
Publisher
PACRIM8
Citation
, 89-89
Abstract
For the application of dielectric ceramics to microwave devices, a high dielectric constant (εr), a near-zero temperature coefficient of resonant frequency (τf) and a high quality factor (Q) value are required. Ba(Zn1/3Ta2/3)O3 (BZT) is known to have a high dielectric constant(εr~29), a small temperature coefficient of the resonance frequency( τf~3ppmoC) and a high quality factor(Qxf ~120,000 at 10GHz) value. On the other hands, sintering at high temperature for extended time is required to obtain the ordered structure for high quality factor. When Ba(Zn1/3Ta2/3)O3 is doped with Ni, the temperature coefficient of resonant frequency can be tuned to near zero. Zr can improve ordered structure and decrease sintering time. In this study, the effect of ZrO2-NiO on the microwave dielectric properties of Ba(Zn1/3Ta2/3)O3 was investigated. And the crystal structure, interfacial secondary phases, microstructure and order–disorder transition of the sintered Ba(Zn1/3Ta2/3)O3 was examined. Adding ZrO2 and NiO could effectively promote the densification even the case of decreasing the sintering time. The samples sintered at 1600 oC for 2 h exhibited ordering structure of Zn and Ta cations. Excellent microwave dielectric properties have been obtained.
URI
http://pubs.kist.re.kr/handle/201004/35441
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KIST Publication > Conference Paper
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