Abstract
The microwave dielectric properties of CaTiO 3-added Mg 2(Ti 0.95Sn 0.05)O 4 ceramics prepared by the mixed oxide route have been investigated. The combination of spinel-structured Mg 2(Ti 0.95Sn 0.05)O 4 and perovskite-structured CaTiO 3 forms a two-phase system (1 − x)Mg 2(Ti 0.95Sn 0.05)O 4– xCaTiO 3, which was confirmed by the XRD patterns and the EDX analysis and it also leads to a zero τ f . The microwave dielectric properties of the ceramics can be effectively controlled by varying the x value. For practical applications, a new microwave dielectric material 0.91Mg 2(Ti 0.95Sn 0.05)O 4–0.09CaTiO 3 is suggested and it possesses a good combination of dielectric properties with an ɛ r of ∼18.01, a Q × f of ∼92,000 GHz, and a τ f of ∼0 ppm/°C, which makes it is a very promising candidate material for high frequency applications.
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