Preparation and characterization of two new dielectric ceramics Ba3La2Ti2Nb2O15 and Ba2La3Ti3NbO15

被引：22

作者：

Fang, L ^{[1
]}

Zhang, H ^{[1
]}

Hong, XK ^{[1
]}

Meng, FC ^{[1
]}

Yang, JF ^{[1
]}

Huang, TH ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

来源：

MATERIALS LETTERS | 2004年 / 58卷 / 30期

基金：

中国国家自然科学基金;

关键词：

X-ray diffraction; dielectrics; dielectric resonators; microwave ceramics; hexagonal perovskites;

D O I：

10.1016/j.matlet.2004.08.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two new A(5)B(4)O(15)-type cation-deficient hexagonal perovskites Ba3La2Ti2Nb2O15 and Ba2La3Ti3NbO15 were prepared in the BaO-La2O3-TiO2-Nb2O5 system by high temperature solid-state reaction route. The phase and structure of the ceramics were characterized by Xray diffraction and scanning electron microscope (SEM). Ba3La2Ti2Nb2O15 has a dielectric constant of 49.37, a high quality factors with Q(u) x f up to 20,207 at 4.8692 GHz, and a small temperature coefficient of resonant frequency (tau(f)) + 4 ppm degreesC(-1) at room temperature; Ba2La3Ti3NbO15 has a dielectric constant of 42.83 with high Q(u) x f up to 21,726 at 5.8562 GHz, and a low tau(f) of -8 ppm degreesC(-1). (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：3884 / 3887

页数：4

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