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Microwave Dielectric Properties of MLi 2 Ti 6 O 14 [M=Ba and Sr] Ceramics and Their Compatibility with Sliver
Author(s) -
Su Congxue,
Fang Weishuang,
Wei Zhenhai,
Tang Ying,
Fang Liang
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.13344
Subject(s) - orthorhombic crystal system , materials science , sintering , ceramic , temperature coefficient , microwave , dielectric , analytical chemistry (journal) , mineralogy , crystallography , chemistry , metallurgy , composite material , crystal structure , optoelectronics , chromatography , physics , quantum mechanics
Microwave dielectric properties of Li ‐containing orthorhombic compounds with the composition of MLi 2 Ti 6 O 14 (M = Ba and Sr) were investigated. The ceramics were synthesized by the conventional solid‐state reaction route. The optimized sintering temperatures for the BaLi 2 Ti 6 O 14 and SrLi 2 Ti 6 O 14 ceramics are 1025°C and 1000°C, respectively. Favorable microwave dielectric properties were obtained with moderate ε r of 31.7 and 33.6, quality factor Q × f values of 23 300 (at 7.3 GHz) and 8700 GHz (at 6.8 GHz), and low‐temperature coefficient of resonant frequency (τ f ) values of −15.4 and −2.7 ppm/°C for BaLi 2 Ti 6 O 14 and SrLi 2 Ti 6 O 14 ceramics, respectively. The addition of BaCu (B 2 O 5 ) can effectively reduce the sintering temperature below 930°C without degrading the microwave dielectric properties. Compatibility with Ag electrode indicates these materials could be applied to low‐temperature cofired ceramic devices.