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Low‐Temperature Sintering and Microwave Dielectric Properties of ZnNb 2 O 6 – TiO 2 Ceramics with BaCu ( B 2 O 5 ) Additions
Author(s) -
Guo Mei,
Dou Gang,
Gong Shuping,
Zhou Dongxiang
Publication year - 2012
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2012.02793.x
Subject(s) - sintering , materials science , ceramic , microstructure , composite number , permittivity , dielectric , temperature coefficient , microwave , analytical chemistry (journal) , mineralogy , composite material , chemistry , chromatography , physics , optoelectronics , quantum mechanics
The influence of BaCu ( B 2 O 5 ) ( BCB ) on densification, phases, microstructure and microwave dielectric properties of ZnNb 2 O 6 – x TiO 2 ( x = 1.70–1.90) composite ceramics have been investigated. Undoped ZnNb 2 O 6 –1.8 TiO 2 ceramics sintered at 1200°C exhibit temperature coefficient of resonant frequency ( τ f ) ~9.25 ppm/°C. When BaCu ( B 2 O 5 ) was added, the sintering temperature of the ZnNb 2 O 6 –1.8 TiO 2 composite ceramics was effectively reduced to 950°C. The results indicated that the permittivity and Q × f were dependent on the sintering temperature and the amounts of BaCu ( B 2 O 5 ). Addition of 3.0 wt% BaCu ( B 2 O 5 ) in ZnNb 2 O 6 –1.8 TiO 2 ceramics sintered at 950°C showed excellent dielectric properties of ε r = 40.9, Q × f = 12,200 GHz ( f = 5.015 GHz) and τ f = +0.3 ppm/°C.