Microwave dielectric properties of the spinel composition Mg1+xTixAl2-2xO4

Abstract

The objects of our research is magnesium aluminates (spinel), in which the electric charge of Al3+ cation is partially substituted with constitutive trivalent cation of Mg2+ and Ti 4+ in the system with the following composition: Mg1+xTixAl2-2xO4 with (x) varying from 0,1 to 0,6. X-ray diffraction data shows that within the above values of (x) the composition is a single phase spinel. The microwave basic parameters were measured as εr, tan δ and τf, respectively with the following values: εr = 6-12, tanδ = (1.5-3.5) x 10-4 at 10 GHz and Qf = 70 000 – 90 000, and τf from -50 to -70 ppm/deg.