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) solidsolution 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 À1 ), showing great potential for MW applications.