Effects of BaCu(B2O5) addition on sintering temperature and microwave dielectric properties of Ba5Nb4O15-BaWO4 ceramics

doi:10.1088/1674-1056/23/4/047801

Abstract The effects of BaCu(B₂O₅) (BCB) addition on the microstructure, phase formation, and microwave dielectric properties of Ba₅Nb₄O₁₅-BaWO₄ ceramic are investigated. As a sintering aid, BaCu(B₂O₅) ceramic could effectively lower the sintering temperature of Ba₅Nb₄O₁₅-BaWO₄ ceramic from 1100 ℃ to 950 ℃ due to the liquid-phase effect. Meanwhile, BaCu(B₂O₅) addition effectively improves the densification of Ba₅Nb₄O₁₅-BaWO₄ ceramic and significantly influences the microwave dielectric properties. X-ray diffraction analysis reveals that Ba₅Nb₄O₁₅ and BaWO₄ coexist with no crystal phase of BaCu(B₂O₅) in the sintered ceramics. The Ba₅Nb₄O₁₅-BaWO₄ ceramics with 1.0 wt% BaCu(B₂O₅) sintered at 950 ℃ for 2 h presents good microwave dielectric properties of ε_r=19.0, high Q× f of 33802 GHz and low τ_f of 2.5 ppm/℃.

Keywords: low-temperature co-fired ceramics composite ceramics BaCu(B₂O₅) (BCB)

Received: 18 June 2013
Revised: 30 September 2013
Accepted manuscript online:

PACS:

78.20.Ci

(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51372031, 61171047, 51132003, and 61271038), the Program for New Century Excellent Talents in University, China (Grant No. NCET-12-0090), and Science Fund from the Science and Technology Department of Sichuan Province, China (Grant No. 2013GZX0144).

Corresponding Authors: Su Hua
E-mail: uestcsh@163.com

About author: 78.20.Ci

Cite this article:

Jia Rui-Long (贾瑞龙), Su Hua (苏桦), Tang Xiao-Li (唐晓莉), Jing Yu-Lan (荆玉兰) Effects of BaCu(B₂O₅) addition on sintering temperature and microwave dielectric properties of Ba₅Nb₄O₁₅-BaWO₄ ceramics 2014 Chin. Phys. B 23 047801

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Effects of BaCu(B2O5) addition on sintering temperature and microwave dielectric properties of Ba5Nb4O15-BaWO4 ceramics

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Effects of BaCu(B₂O₅) addition on sintering temperature and microwave dielectric properties of Ba₅Nb₄O₁₅-BaWO₄ ceramics