Crystal structure, microwave dielectric properties, and far-infrared spectroscopy of a novel low-dielectric constant tremolite ceramic CaZnGe2O6

The diopside-structured CaZnGe 2 O 6 ceramics were synthesized using the conventional solid-state reaction method in this study, and their crystal structure, microstructural evolution, and microwave dielectric properties were systematically investigated. The XRD and Rietveld refinement analyses confirmed that CaZnGe 2 O 6 crystallizes in the monoclinic crystal system with a C 2/ c space group. The intrinsic microwave dielectric properties of the ceramics were evaluated using far-infrared spectroscopy. The ceramic structure exhibits high density and microstructural homogeneity after sintering at 1130 °C, resulting in exceptional microwave dielectric properties achieved at this optimal temperature ( ε r  = 8.78 Q×f  = 63,782 GHz, τ f  = −66.4 ppm/°C). These findings highlight the potential application of CaZnGe 2 O 6 ceramics as low-permittivity materials suitable for microwave devices.