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Effects of BaCu(B 2 O 5 ) Addition on Phase Transition, Sintering Temperature, and Microwave Properties of Ba 4 LiNb 3 O 12 Ceramics
Author(s) -
Fang Liang,
Chu Dongjin,
Li Chunchun,
Zhou Huanfu,
Yang Zhao
Publication year - 2011
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/j.1551-2916.2010.04100.x
Subject(s) - materials science , sintering , ceramic , crystallite , atmospheric temperature range , analytical chemistry (journal) , hexagonal crystal system , dielectric , mineralogy , crystallography , chemistry , metallurgy , thermodynamics , organic chemistry , optoelectronics , physics
Polycrystalline sample of Ba 4 LiNb 3 O 12 is synthesized in the temperature range of 1150°–1180°C by the conventional solid‐state reaction method. A phase transition from cubic to hexagonal perovskite is observed around 1160°C. It is noted that hexagonal phase of Ba 4 LiNb 3 O 12 obtained at 1180°C could be stabilized at a considerably lower temperature (∼950°C) with BaCu(B 2 O 5 ) (BCB) added. BCB addition effectively improves the densification of Ba 4 LiNb 3 O 12 ceramic and significantly affects the microwave dielectric properties. When 4 wt% BCB is added, a dense ceramic can be sintered at 950°C with a ɛ r of 34.5, a high Q × f of 29 600 GHz, and a low τ f of 12.4 ppm/°C. Moreover, BCB‐added Ba 4 LiNb 3 O 12 ceramics have a chemical compatibility with silver.