Phase, microstructure, and microwave dielectric properties of a new ceramic system: (1-x)Mg(Ti0.95Sno0.05)O3-xCaTiO3

The microwave dielectric properties and microstructure of the new ceramic system (1 - x)Mg(Ti0.958Sn0.05)O-3-xCaTiO(3) (0.02 <= x <= 0.08) prepared via a mixed-oxide route were investigated. To attain a temperature-stable material, CaTiO3 was added to Mg(Ti0.95Sn0.05)O-3 as a temperature coefficient of resonant frequency (tau(f)) compensator. The compositions with 0.02 <= x <= 0.08 resulted in a mixture of two phases, Mg(Ti0.95Sn0.05)O-3 and CaTiO3, as confirmed by X-ray diffraction and energy-dispersive X-ray spectroscopic analyses. The values of the dielectric constant (epsilon(r)) and the El of the ceramics were found to increase, and the unloaded quality factor (Qufo) was found to decrease with increasing x values (i.e., increasing CaTiO3 content). Excellent microwave dielectric properties of epsilon(r) approximate to 21.5, Qufo approximate to 112,500 GHz (at 9 GHz), and tau(f) approximate to 1.1 ppm/degrees C were attained for the 0.94{Mg(Ti0.95Sn0.05)O-3}-0.06CaTiO(3) ceramic sintered at 1375 degrees C for 4 h.