Sintering characteristic, crystal structure and microwave dielectric properties of a novel thermally stable ultra-low-firing Na2BiMg2V3O12 ceramic

Abstract

A novel ultra low-firing microwave dielectric ceramic with the composition of Na2BiMg2V3O12 was fabricated by a solid state reaction method. The phase structure, sintering behavior and microwave dielectric properties of ceramics were investigated. The ceramic can be well densified at 660 °C for 4 h. X-ray diffraction data show that Na2BiMg2V3O12 has a cubic garnet structure with lattice parameters of a = 12.4929 A, V = 1,949.80 A3, Z = 8 and ρ = 4.42 g/cm3. The microwave dielectric properties are strongly related to the density and morphology of the samples. The ceramic sintered 660 °C exhibits good microwave dielectric properties with er = 23.2, Q × f = 3,700 GHz and τ f = 8.2 ppm/°C. These results indicate that Na2BiMg2V3O12 ceramic is a candidate for low temperature co-fired ceramics devices, such as chip multi-layer LC filter, microstrip bandpass filter, multilayer antenna.