Effect of ZrO2-NiO on the Microstructure and Microwave Dielectric Properties of Complex Perovskite Ba(Zn1/3Ta2/3)O3
- Effect of ZrO2-NiO on the Microstructure and Microwave Dielectric Properties of Complex Perovskite Ba(Zn1/3Ta2/3)O3
- 강성우; 김태희; 신현정; 김성열; 최선희; 김주선
- BZT; Microwave; Dielectrics
- Issue Date
- , 89-89
- 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.
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