Abstract
Cold sintering process was successfully employed to fabricate (1-x) Li2MoO4 - xMg2SiO4 (LMO-xMSO) microwave dielectric ceramics for 5G enabled technology. Dense LMO-MSO ceramics were obtained with high relative density in the range of 85%-100% under the condition of 200 °C and 500 MPa in an hour. X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS) and Raman spectroscopy showed that both LMO and MSO phases coexist in all composite ceramics, and there is no detectable secondary phase. Composites in LMO-xMSO (0 < x < 0.3) resonated at microwave frequency (~9 GHz) with low relative permittivity (er) of 5.05~5.3 and high microwave quality factor (Q × f) of 9450 ~ 24320 GHz, which are attractive for the applications of 5G enabled components.
Highlights
Microwave (MW) dielectric ceramics are a type of multifunctional material widely used for many basic components in communication systems, such as dielectric antenna, oscillators, substrates, and phase shifters (Cava, 2001; Reaney and Iddles, 2006; Zhou et al, 2018)
Li2MoO4 and Mg2SiO4 were selected to fabricate (1-x) Li2MoO4–xMg2SiO4 composite ceramics (LMO-xMSO, x = 0, 5, 10, 15, 20, 30, 50, and 90 wt%) by Cold sintering process (CSP) to show the possibility of fabricating dense silicate composite ceramics at a low temperature (≤200◦C)
A high relative density of 85–100% was obtained in LMO-xMSO composite ceramics with x < 50%, which fully demonstrates that dense LMO-xMSO samples can be produced by cold-sintering with the assistance of deionized water where LMO is predominant
Summary
Microwave (MW) dielectric ceramics are a type of multifunctional material widely used for many basic components in communication systems, such as dielectric antenna, oscillators, substrates, and phase shifters (Cava, 2001; Reaney and Iddles, 2006; Zhou et al, 2018). Li2MoO4 and Mg2SiO4 were selected to fabricate (1-x) Li2MoO4–xMg2SiO4 composite ceramics (LMO-xMSO, x = 0, 5, 10, 15, 20, 30, 50, and 90 wt%) by CSP to show the possibility of fabricating dense silicate composite ceramics at a low temperature (≤200◦C).
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