Effects of Bi doping on sintering and dielectric characteristics of Ba6-3xLa8+2x (Ti0.95 Zr0.05)18O54(x=2/3) ceramics

Xu Fang Gao; Tai Qiu

Effects of Bi doping on sintering and dielectric characteristics of Ba_6-3xLa_8+2x (Ti_0.95 Zr_0.05)₁₈O₅₄(x=2/3) ceramics

Xu Fang Gao, Tai Qiu

College of Materials Science and Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

The sintering properties, microstructures and dielectric characteristics of Ba_6-3x(La_1-m Bi_m)_8+2x (Ti_0.95Zr_0.05)₁₈O₅₄ (x=2/3) microwave dielectric ceramics prepared by conventional solid-state route were studied. The results show that Bi³⁺ replaced La³⁺ into A₁ rhombic sites and a single-phase solid solution with tungstenbronze-like structure formed in the range of 0<m<0.4. When Bi³⁺ content exceeds this range, a second phase of La_0.176Bi_0.824O_1.5 appears in the solid solution. Bi doping can lower the sintering temperature of Ba_6-3x(La_1-m Bi_m)_8+2x (Ti_0.95 Zr_0.05)₁₈O₅₄(x=2/3) ceramics from 1400°C to 1300°C, while a significant improvement of dielectric constant is achieved. The temperature coefficient of resonant frequency (τ_f) decreases, and the quality factor (Q·f) rapidly decreases. When m=0.05, the optimal microwave dielectric characteristics are achieved as ε_r=88.63, Q·f=4395 GHz, τ_f=6.25×10^-6/°C.

Original language	English
Pages (from-to)	529-533
Number of pages	5
Journal	Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
Volume	20
Issue number	3
State	Published - Mar 2010

Keywords

Bi doping
Dielectric property
Microwave dielectric ceramics
Tungstenbronze-like structure

Cite this

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title = "Effects of Bi doping on sintering and dielectric characteristics of Ba6-3xLa8+2x (Ti0.95 Zr0.05)18O54(x=2/3) ceramics",

abstract = "The sintering properties, microstructures and dielectric characteristics of Ba6-3x(La1-m Bim)8+2x (Ti0.95Zr0.05)18O54 (x=2/3) microwave dielectric ceramics prepared by conventional solid-state route were studied. The results show that Bi3+ replaced La3+ into A1 rhombic sites and a single-phase solid solution with tungstenbronze-like structure formed in the range of 03+ content exceeds this range, a second phase of La0.176Bi0.824O1.5 appears in the solid solution. Bi doping can lower the sintering temperature of Ba6-3x(La1-m Bim)8+2x (Ti0.95 Zr0.05)18O54(x=2/3) ceramics from 1400°C to 1300°C, while a significant improvement of dielectric constant is achieved. The temperature coefficient of resonant frequency (τf) decreases, and the quality factor (Q·f) rapidly decreases. When m=0.05, the optimal microwave dielectric characteristics are achieved as εr=88.63, Q·f=4395 GHz, τf=6.25×10-6/°C.",

keywords = "Bi doping, Dielectric property, Microwave dielectric ceramics, Tungstenbronze-like structure",

author = "Gao, {Xu Fang} and Tai Qiu",

year = "2010",

month = mar,

language = "英语",

volume = "20",

pages = "529--533",

journal = "Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals",

issn = "1004-0609",

publisher = "Central South University of Technology",

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T1 - Effects of Bi doping on sintering and dielectric characteristics of Ba6-3xLa8+2x (Ti0.95 Zr0.05)18O54(x=2/3) ceramics

AU - Gao, Xu Fang

AU - Qiu, Tai

PY - 2010/3

Y1 - 2010/3

N2 - The sintering properties, microstructures and dielectric characteristics of Ba6-3x(La1-m Bim)8+2x (Ti0.95Zr0.05)18O54 (x=2/3) microwave dielectric ceramics prepared by conventional solid-state route were studied. The results show that Bi3+ replaced La3+ into A1 rhombic sites and a single-phase solid solution with tungstenbronze-like structure formed in the range of 03+ content exceeds this range, a second phase of La0.176Bi0.824O1.5 appears in the solid solution. Bi doping can lower the sintering temperature of Ba6-3x(La1-m Bim)8+2x (Ti0.95 Zr0.05)18O54(x=2/3) ceramics from 1400°C to 1300°C, while a significant improvement of dielectric constant is achieved. The temperature coefficient of resonant frequency (τf) decreases, and the quality factor (Q·f) rapidly decreases. When m=0.05, the optimal microwave dielectric characteristics are achieved as εr=88.63, Q·f=4395 GHz, τf=6.25×10-6/°C.

AB - The sintering properties, microstructures and dielectric characteristics of Ba6-3x(La1-m Bim)8+2x (Ti0.95Zr0.05)18O54 (x=2/3) microwave dielectric ceramics prepared by conventional solid-state route were studied. The results show that Bi3+ replaced La3+ into A1 rhombic sites and a single-phase solid solution with tungstenbronze-like structure formed in the range of 03+ content exceeds this range, a second phase of La0.176Bi0.824O1.5 appears in the solid solution. Bi doping can lower the sintering temperature of Ba6-3x(La1-m Bim)8+2x (Ti0.95 Zr0.05)18O54(x=2/3) ceramics from 1400°C to 1300°C, while a significant improvement of dielectric constant is achieved. The temperature coefficient of resonant frequency (τf) decreases, and the quality factor (Q·f) rapidly decreases. When m=0.05, the optimal microwave dielectric characteristics are achieved as εr=88.63, Q·f=4395 GHz, τf=6.25×10-6/°C.

KW - Bi doping

KW - Dielectric property

KW - Microwave dielectric ceramics

KW - Tungstenbronze-like structure

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ER -

Effects of Bi doping on sintering and dielectric characteristics of Ba_6-3xLa_8+2x (Ti_0.95 Zr_0.05)₁₈O₅₄(x=2/3) ceramics

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