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Novel Temperature Stable Li 2 MnO 3 Dielectric Ceramics with High Q for LTCC Applications
Author(s) -
Tseng ChingFang,
Tseng PoJu,
Chang ChiMin,
Kao YuChieh
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.12871
Subject(s) - sintering , ceramic , materials science , dielectric , doping , microwave , atmospheric temperature range , mineralogy , analytical chemistry (journal) , composite material , chemistry , optoelectronics , telecommunications , organic chemistry , computer science , meteorology , physics
Novel microwave dielectric ceramics in the Li 2 MnO 3 system with high Q prepared through a conventional solid‐state route had been investigated. All the specimens exhibited single phase ceramics sintered in the temperature range 1140°C–1230°C. The microwave dielectric properties of Li 2 MnO 3 ceramics were strongly correlated with sintering temperature and density. The best microwave dielectric properties of ε r = 13.6, Q × f = 97 000 (GHz), and τ f = −5.2 ppm/°C could be obtained as sintered at 1200°C for 4 h. BaCu ( B 2 O 5 ) ( BCB ) could effectively lower the sintering temperature from 1200°C to 930°C and slightly induced degradation of the microwave dielectric properties. The Li 2 MnO 3 ceramics doped with 2 wt% BaCu ( B 2 O 5 ) had excellent dielectric properties of ε r = 11.9, Q × f = 80 600 (GHz), and τ f = 0 ppm/°C. With low sintering temperature and good dielectric properties, the BCB added Li 2 MnO 3 ceramics are suitable candidates for LTCC applications in wireless communication system.