Phase Evolution and Microwave Dielectric Properties of ( Bi _{1− x} Fe _x ) VO ₄ ( x  ≤ 0.40) Ceramics

Abstract

In the present work, ( Bi 1− x Fe x ) VO 4 ( x ≤ 0.40) ceramics were prepared using the solid‐state reaction method. All the ceramics could be well densified at sintering temperatures below 800°C. X ‐ray diffraction ( XRD ) results showed that monoclinic solid solution was formed within x ≤ 0.08. When x ≥ 0.10, both monoclinic scheelite and FeVO 4 phases were detected. The ( Bi 0.92 Fe 0.08 ) VO 4 sample sintered at 720°C for 2 h had a permittivity of 57.5 and a Q f value of 15 000 GHz. The IR reflectivity was fitted to study the intrinsic dielectric properties, showing that the majority of the dielectric contribution for this system at microwave region was attributed to the absorptions of structural phonon oscillation in infrared region.