Electrical properties of Sr${}_3$Mo${}_{1-x}$W${}_x$O${}_6$-based solid solution

Herein, a study on the suitability of the Sr${}_3$Mo${}_{1-x}$W${}_x$O${}_6$ (0.1 ≤ x ≤ 0.9) solid-solution system for radio frequency and microwave (MW) applications is reported. The ceramic powders are synthesized via solid-state reaction at 1423 K for 6 h. X-ray diffraction and scanning electron microscopy are performed to confirm the double-perovskite-type structure and investigate the surface morphology, respectively. Electrical characterization of the system as a function of temperature is performed using impedance spectroscopy. The equivalent circuit with two parallel association resistor-constant phase elements (R-CPEs), connected in series, associated with grain and grain boundary effects is used to adjust the electric response of the solid solutions. Sr${}_3$Mo${}_{0.9}$W${}_{0.1}$O${}_6$ solid solution exhibit a resonant frequency temperature coefficient (τ${}_f$) value close to zero (8.5 ppm K${}^{-1}$), showing great potential for MW applications. (© 2022 Wiley‐VCH GmbH)