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Microwave dielectric properties of (ABi)1/2MoO4 (A = Li, Na, K, Rb, Ag) type ceramics with ultra-low firing temperatures
Materials Chemistry and Physics,-0001,():
A series of (ABi)1/2MoO4 (A=Li, Na, K, Rb, Ag) compositions were studied in regard to the sintering behavior, phase composition, microwave dielectric properties and chemical compatibility with silver and/or aluminum for electrodes. All the (ABi)1/2MoO4 (A=Li, Na, K, Rb, Ag) ceramics could be sintered below 700 oC with high relative density >93%. Whereas the (KBi)1/2MoO4 ceramic can be sintered to a high density at around 630 oC/2hrs with a relative permittivity ~37, a Qf value of 4,000 GHz and a temperature coefficient of resonant frequency (TCF) ~+117 ppm/oC. Furthermore, from the XRD analysis of co-fired ceramics, the (KBi)1/2MoO4 ceramic reacts with silver but not with aluminum at its densification temperature. The (ABi)1/2MoO4 (A=Li, Na, K, Rb, Ag) type ceramics can all be considered into the new field of ultra-low temperature co-firing dielectrics for multilayer applications.
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