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Preparation and Characterization of a New Microwave Dielectric Ceramic Ba 4 ZnTi 11 O 27
Author(s) -
Zhou Huanfu,
Chen Xiuli,
Fang Liang,
Hu Changzheng,
Wang Hong
Publication year - 2010
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.1551-2916.2009.03561.x
Subject(s) - monoclinic crystal system , ceramic , materials science , temperature coefficient , sintering , dielectric , microwave , atmospheric temperature range , relative permittivity , permittivity , analytical chemistry (journal) , mineralogy , composite material , crystal structure , crystallography , chemistry , optoelectronics , physics , chromatography , quantum mechanics , meteorology
Preparation, sintering behavior, and microwave dielectric properties of Ba 4 ZnTi 11 O 27 ceramic were investigated. The single‐phase Ba 4 ZnTi 11 O 27 ceramic can be well densified in the temperature range from 1175° to 1250°C with a relative density about 97%. X‐ray diffraction data show that Ba 4 ZnTi 11 O 27 has a monoclinic structure ( C 2/ m ), with lattice parameters of a =19.81549 Å, b =11.43072 Å, and c =9.91129 Å when the sintering temperature is 1200°C. Pure monoclinic Ba 4 ZnTi 11 O 27 ceramic sintered at 1200°C for 2 h exhibits good microwave dielectric properties with a permittivity about 36.8, Q × f value about 16 460 GHz, and temperature coefficient of resonant frequency about 17.2 ppm/°C. The addition of BaCu(B 2 O 5 ) can effectively lower the sintering temperature from 1200° to 925°C and does not induce degradation of the microwave dielectric properties. Obviously, the Ba 4 ZnTi 11 O 27 ceramic can be applied to microwave low‐temperature cofired ceramics devices.