Microwave dielectric properties and crystal structure of CaO-Li2O-(1-x)Sm2O3-xLn(2)O(3)-TiO2 (Ln, lanthanide) ceramics system

被引：40
|
作者：
Takahashi, H [1 ]
Baba, Y [1 ]
Ezaki, K [1 ]
Shibata, K [1 ]
机构：
[1] SANYO ELECT CO LTD, DEVICE DEPT, OSAKA 574, JAPAN
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 1996年 / 35卷 / 9B期
关键词：
microwave dielectric ceramics; dielectric constant; f center dot Q value; temperature coefficient; perovskite; orthorhombic; lanthanide element;
D O I：
10.1143/JJAP.35.5069
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have investigated the microwave dielectric properties and crystal structure of the CaO-SrO-Li2O-Sm2O3 . Ln(2)O(3)-TiO2 system (Ln: lanthanide). This system is orthorhombic with a GdFeO3-type perovskite structure, which is the same as that of CaTiO3. It was also seen that the lanthanide ionic radius has a strong influence on the dielectric properties. Namely, the dielectric constant is affected by the unit-cell volume and the f . Q value is affected by variations in the crystal structure and by the appearance of another phase. Excellent dielectric properties of epsilon(r)=123 and f . Q value=4150 GHz and good temperature stability for the resonant frequency (tau(f)'=10.8 PPm/degrees C) at 3 GHz were obtained with a composition of CaO : SrO : Li2O : Sm2O3 : Nd2O3 : TiO2=15 : 1 : 9 : 6 : 6 : 63 (molar ratio).
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页码：5069 / 5073
页数：5
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