Premium
Ultra‐low temperature sintering microwave dielectric ceramics based on Ag 2 O–MoO 3 binary system
Author(s) -
Zhang Gaoqun,
Guo Jing,
Wang Hong
Publication year - 2017
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.14760
Subject(s) - materials science , ceramic , sintering , microstructure , analytical chemistry (journal) , microwave , dielectric , relative permittivity , permittivity , mineralogy , metallurgy , chemistry , optoelectronics , physics , chromatography , quantum mechanics
The Ag 2 Mo 2 O 7 and Ag 6 Mo 10 O 33 ceramics for ultra‐low temperature co‐fired ceramic application were prepared by the solid‐state reaction route. The optimized densification temperatures of Ag 2 Mo 2 O 7 and Ag 6 Mo 10 O 33 are 460°C and 500°C, respectively. The phase structures and microstructures of these ceramics were systematically studied. The Ag 2 Mo 2 O 7 ceramic sintered at 460°C/4 h exhibits excellent microwave dielectric properties with ε r =13.3, Q×f =25 300 GHz and τ f =−142 ppm/°C at 9.25 GHz. The Ag 6 Mo 10 O 33 ceramic sintered at 500°C/4 h shows the microwave dielectric properties with ε r =14.0, Q×f =8500 GHz and τ f =−50 ppm/°C at 9.00 GHz. Moreover, when Ag 2 Mo 2 O 7 samples are sintered at ultra‐low sintering temperatures of 420°C‐490°C, the Q×f values of them are all above 20 000 GHz. Besides, the Ag 2 Mo 2 O 7 ceramic does not react with silver powder or aluminum powder. The variation of relative permittivity, resonant frequency, and Q×f values as a function of operating temperature has been also studied. All the results indicate that the Ag 2 Mo 2 O 7 ceramic is a good candidate for ultra‐low temperature co‐fired microwave devices.