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Published in:
31-08-2019
Phase evolution, far-infrared spectra, and ultralow loss microwave dielectric ceramic of Zn2Ge1+xO4+2x (− 0.1 ≤ x ≤ 0.2)
Published in: Journal of Materials Science: Materials in Electronics | Issue 17/2019
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Abstract
A series of willemite based ceramics Zn2Ge1+xO4+2x with − 0.1 ≤ x ≤ 0.2 were prepared by the solid-state reaction method. Influences of Ge nonstoichiometry on the crystal structure, densification, and microwave dielectric properties were evaluated in terms of X-ray diffraction, SEM, dielectric measurements and far-infrared spectra. Ge excess favored the formation of single-phase willemite but a high level of excess induced appearance of GeO2. In contrast, nominal composition and those with Ge deficiency comprised of ZnO and the willemite phase. Ge excess was found to be beneficial to the densification and dielectric properties optimization of Zn2Ge1+xO4+2x. A composition with x = 0.1 (Zn2Ge1.1O4.2) exhibited the optimum microwave dielectric properties with a relative permittivity εr ~ 7.09, a quality factor Q × f ~ 112,700 GHz (at 14.48 GHz), and a temperature coefficient of resonance frequency τf ~ − 51 ppm/°C.