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Microwave Dielectric Properties of Li 2 (M 2+ ) 2 Mo 3 O 12 and Li 3 (M 3+ )Mo 3 O 12 (M=Zn, Ca, Al, and In) Lyonsite‐Related‐Type Ceramics with Ultra‐Low Sintering Temperatures
Author(s) -
Zhou Di,
Randall Clive A.,
Pang LiXia,
Wang Hong,
Wu XinGuang,
Guo Jing,
Zhang GaoQun,
Shui Li,
Yao Xi
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.1551-2916.2010.04148.x
Subject(s) - temperature coefficient , ceramic , materials science , analytical chemistry (journal) , relative permittivity , permittivity , sintering , dielectric , metallurgy , chemistry , composite material , optoelectronics , chromatography
In this work, the Li 2 (M 2+ ) 2 Mo 3 O 12 and Li 3 (M 3+ )Mo 3 O 12 (M=Zn, Ca, Al, and In) lyonsite‐related structures were prepared using a solid‐state reaction method. Single‐phase lyonsite materials were formed for the following compositions Li 2 Zn 2 Mo 3 O 12 , Li 3 AlMo 3 O 12 , and Li 3 InMo 3 O 12 ceramics. Whereas, the Li 2 Ca 2 Mo 3 O 12 batched compositions produced Li 2 MoO 4 and CaMoO 4 phases. All the four ceramics did not react with Ag and Al powders at their optimal sintering temperatures, which will permit the possibility of cofired electrodes with these metallurgies. The Li 2 Zn 2 Mo 3 O 12 ceramic can be sintered at 630°C with a relative permittivity of 11.1, a Q × f value of ∼70 000 GHz, and a temperature coefficient of −90 ppm/°C at 14.6 GHz. The Li 3 AlMo 3 O 12 ceramic sintered at 570°C has a relative permittivity of 9.5, a Q × f value of ∼50 000 GHz, and a temperature coefficient of −73 ppm/°C at 14.1 GHz. The Li 3 InMo 3 O 12 ceramic sintered at 630°C has a relative permittivity of 9.8, a Q × f value of ∼36 000 GHz, and a temperature coefficient of −73 ppm/°C at 15.0 GHz. These ceramics are a good candidate for the expanding family of ultra‐low temperature cofired ceramic technologies, for filter and substrate applications at the high‐frequency range.