Electrical Properties of Sr₃Mo_1–xW_xO₆‐Based Solid Solution

Abstract

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.