In this work, the Li2(M2+)2Mo3O12 and Li3(M3+)Mo3O12 (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 Li2Zn2Mo3O12, Li3AlMo3O12, and Li3InMo3O12 ceramics. Whereas, the Li2Ca2Mo3O12 batched compositions produced Li2MoO4 and CaMoO4 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 Li2Zn2Mo3O12 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 Li3AlMo3O12 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 Li3InMo3O12 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.
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Document Type: Research Article
Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
Micro-optoelectronic Systems Laboratories, Xi'anTechnological University, Xi'an 710032, Shaanxi, China
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
Publication date: 2011-03-01