Synthesis of monoclinic CaSnSiO5 ceramics and their microwave dielectric properties

The monoclinic CaSnSiO 5 phase could be synthesized with a conventional solid state method. The molar ratio of Ca:Sn:Si=1:1.05:1 was employed to synthesize pure CaSnSiO 5 ceramics through non-stoichiometric effect. The CaSnSiO 5 ceramics sintered at 1525   °C exhibited microwave dielectric properties : a dielectric constant ( ε r ) of 9.08, a quality factor ( Q × f ) of 61,000   GHz and a temperature coefficient of resonant frequency ( τ f ) of 35   ppm/°C. They are promising millimeter-wave ceramic materials.