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Ba 5 Li 2 W 3 O 15 : A New Li ‐Containing Perovskite‐Type Microwave Ceramic with High Q and Low τ f
Author(s) -
Fang Liang,
Wei Zhenhai,
Liao Wei,
Zhou Huanfu,
Zhang Hui,
Xiang Fei
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12649
Subject(s) - sintering , ceramic , materials science , temperature coefficient , permittivity , microwave , analytical chemistry (journal) , scheelite , dielectric , mineralogy , chemistry , composite material , optoelectronics , metallurgy , chromatography , telecommunications , tungsten , computer science
A new Li ‐containing microwave ceramic Ba 5 Li 2 W 3 O 15 with hexagonal perovskite structure was prepared through a solid‐state ceramic route. Small amount of scheelite BaWO 4 appeared as a second phase during sintering. The Ba 5 Li 2 W 3 O 15 could be well densified at 1120°C and exhibits good microwave dielectric properties with permittivity (ε r ) of 25.4, high Q × f value about 39 000 GHz, and low temperature coefficient of resonate frequency (τ f ) of 10 ppm/°C. The addition of BaCu ( B 2 O 5 ) can effectively lower the sintering temperature from 1120°C to 900°C and does not induce degradation of the microwave dielectric properties. These results indicate that the Ba 5 Li 2 W 3 O 15 ceramic might be a promising candidate in microwave dielectric resonators.