Correlation of microwave dielectric properties and normal vibration modes of xBa(Mg1/3Ta2/3)O3-(1-x)Ba(Mg1/3Nb2/3)O3 ceramics:: II.: Infrared spectroscopy

被引：49
|
作者：
Chen, YC [1 ]
Cheng, HF
Liu, HL
Chia, CT
Lin, IN
机构：
[1] Natl Taiwan Normal Univ, Dept Phys, Taipei 116, Taiwan
[2] Natl Tsing Hua Univ, Ctr Mat Sci, Hsinchu 300, Taiwan
来源：
JOURNAL OF APPLIED PHYSICS | 2003年 / 94卷 / 05期
关键词：
D O I：
10.1063/1.1597969
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The relationship between the microwave dielectric properties and the IR active phonons of xBa(Mg1/3Ta2/3)O-3-(1-x)Ba(Mg1/3Nb2/3)O-3 ceramics was investigated. The IR modes were assigned, and the origin of dielectric response was determined. Among the 15 prominent IR modes, we found that the normal vibrations of the O layers and that of the Ta/Nb layers are strongly correlated to the measured dispersion parameters, such as the resonant strength (4pirho) and the damping coefficient (gamma). The frequency shifts of the normal modes of the O layers and that of the Ta/Nb layers explain the linear decrease of microwave dielectric constant (K) as x increases, while the width of these modes correlate with the Qxf value. (C) 2003 American Institute of Physics.
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页码：3365 / 3370
页数：6
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