Structure and properties analysis for MgTiO3 and (Mg0.97M0.03)TiO3 (M = Ni, Zn, Co and Mn) microwave dielectric materials

Single phase of MgTiO3 and (Mg0.97M0.03)TiO3 (M = Ni, Zn, Co and Mn) ceramics was synthesized at the sintering temperature of 1275 °C. Relationships between structure and microwave dielectric properties were investigated on the basis of Rietveld refinement. The dielectric constant (εr) was affected by the relative density and the dielectric polarizability. The quality factor (Qf) increased with the increase of the packing fraction. The temperature coefficient of resonant frequency (τf) moved toward positive due to the increase of A-site bond valence.

► MgTiO3 and (Mg0.97M0.03)TiO3 (M = Ni, Zn, Co and Mn) ceramics was synthesized.
► Single phase of ilmenite structure was confirmed by the XRD analysis.
► Structure and dielectric properties were investigated by Rietveld refinement.
► Densification and polarizabilities were used to analyse the dielectric constant.
► Packing fraction and bond valence were investigated to study the Qf and τf.