Microwave dielectric properties of cold sintered Al2O3-NaCl composite

Alumina-sodium chloride (Al2O3-NaCl) composite (1:1 ratio in weight percentage (wt%)) is cold sintered at 120 °C. The cold sintered composite with a densification of 96% has εr and tan δ values 6.53 and 0.007 respectively at 1 MHz. The microwave dielectric properties of Al2O3-NaCl composite at 5 GHz are εr = 6.04 and tan δ = 0.002 with τε value +32 ppm/°C. The energy saving cold sintering process (CSP) indicates the possibility to integrate with polymers as well as metals for the fabrication of electronic products.