Microwave Dielectric Characteristics of (Mg0.95M0.05)Ta2O6 (M = Ni, Zn, Mn) Ceramic Series

The (Mg0.95M0.05)Ta2O6 (M = Ni, Zn, Mn) ceramics are prepared through the solid-state ceramic route and their microwave dielectric properties are investigated as a function of ionic radius difference of M and Mg. The forming of (Mg0.95M0.05)Ta2O6 solid solutions were confirmed by the XRD analysis and the measured lattice parameters and the ceramics showed a nonlinear variation of dielectric properties with the sintering temperature. In addition, the sintering temperature has slight effect on dielectric constant and temperature coefficient of resonant frequency, but significant on Q × f value. In particularly, (Mg0.95Ni0.05)Ta2O6 shows a relatively high Q × f of 88,300 GHz along with a dielectric constant of 28.73 and a τf of 44.9 ppm/°C, indicating the dielectric can be used for high-frequency applications.

► (Mg0.95M0.05)Ta2O6 solid solutions were synthesized by solid-state method.
► Measured lattice parameters were obtained.
► Compound using (Mg0.95Ni0.05)Ta2O6 shows a tremendous increase in the Q × f value.