Abstract
Excellent spinel microwave dielectric ceramics (1-x)Zn2TiO4-xLi2MgTi3O8 (ZTLMTx, x = 1/3 and 2/3) were prepared at relatively low densification temperatures of 1100 °C and 1080 °C, respectively. A disordered cubic phase with space group Fd-3m was formed at x = 1/3, whereas an ordered cubic phase with space group P4332 was formed at x = 2/3. The ceramics at x = 1/3 and 2/3 exhibited promising microwave dielectric properties of ɛr = 18.27 and 22.96, Q × f = 91,877 GHz and 75,186 GHz, and τf = −42.3 ppm/°C and −21.05 ppm/°C, respectively. The large deviation between the experimental ԑr and theoretical εth of 1/3 and 2/3 ceramics were 18.3 % and 57 %, respectively, due to the underestimation of the ionic polarizability of Ti4+. The difference in their ɛr, Q × f, and τf were discussed by the structure, FWHM of A1g, lattice energy and bond energy in detail.
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