Abstract
The Mo-based glass-free spinel-type structure of the (Na1-xKx)2MoO4 (x = 0.0, 0.1, and 0.2) ceramic series was prepared using the traditional solid-state method at the low sintering temperature (<650 °C). The microwave dielectric properties of the (Na1-xKx)2MoO4 series were determined in terms of phase compositions, crystal structure (via XRD), and microstructure analysis (via FE-SEM and EDS). The results revealed that the double-phase (cubic and orthorhombic) formation plays a significant role in the entire (Na1-xKx)2MoO4 series. It exhibits excellent dielectric properties: dielectric constant εr = 4 (1 GHz)/3.77 (15 GHz), tangent loss tan δ = 8.3 × 10−2 (1 GHz)/7 × 10−3 (15 GHz; Q × f = 2143 GHz), temperature coefficient of frequency (TCF) τf = −6.45 ppm/°C, and room temperature thermal conductivity (κ) = 1.76 W/(m.K) for x = 0.1 at a sintering temperature of 575 °C. These make the (Na1-xKx)2MoO4 ceramic series a potential candidate for low-temperature co-fired ceramic (LTCC) substrate applications (as used in antennas) for high-speed data communications.
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