Synthesis, characterization and microwave dielectric properties of Zn2GeO4 ceramics

Zn 2 GeO 4 ceramic materials were synthesized by solid-state method. Zn 2 GeO 4 powders were investigated with X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR) spectrum, Raman spectrum, X-ray photoelectron spectrum (XPS), and high resolution transmission electron microscopy (HRTEM). A dense microstructure of Zn 2 GeO 4 ceramics developed when specimens were sintered at above 1150   °C. The Zn 2 GeO 4 ceramics sintered at 1300   °C exhibited good microwave dielectric properties: a dielectric constant ( ε r ) of 6.87, a quality factor ( Q   ×   f ) of 102,700   GHz and a temperature coefficient of resonant frequency ( τ f ) of −32.4   ppm/°C. The results showed that Zn 2 GeO 4 ceramics were promising millimeter-wave ceramic candidate materials.