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  • Title: Structural Evolution and Microwave Dielectric Properties of xZn0.5Ti0.5NbO4-(1- x)Zn0.15Nb0.3Ti0.55O2 Ceramics.
    Author: Yang H, Zhang S, Yang H, Zhang X, Li E.
    Journal: Inorg Chem; 2018 Jul 16; 57(14):8264-8275. PubMed ID: 29957929.
    Abstract:
    Structure and microwave properties of xZn0.5Ti0.5NbO4-(1 - x)Zn0.15Nb0.3Ti0.55O2 ceramics in the range of x = 0.0-1.0 were investigated. Rietveld refinement analysis and Raman spectra show that rutile- and orthorhombic-type solid solutions formed at 0-0.2 and 0.65-1, a composite at 0.2-0.64. In the solid solution regions, chemical bonds are enlarged. In this case, the Zn/Ti/Nb-O1 bond covalency and bond susceptibility are reduced, and lattice energy and thermal expansion coefficient increase along with x increases, which is mainly responsible for the development of microwave dielectric properties. Furthermore, far-infrared spectra and a classical oscillator model were used to discuss the intrinsic dielectric properties in detail. Temperature stable ceramic was obtained for x = 0.516: εr ∼ 46.11, Q × f ∼ 27 031 GHz, and τf ∼ -1.51 ppm/°C, which is promising for microwave applications.
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