Sintering temperature dependences of (1 − y)(Mg0.95Mn0.05)2(Ti0.95Sn0.05)O4-y(Ca0.6La0.8/3)TiO3 microwave dielectric ceramics with a zero temperature coefficient of resonant frequency

High-quality (1 - y)(Mg0.95Mn0.05)2(Ti0.95Sn0.05)O4-y(Ca0.6La0.8/3)TiO3 ceramics were prepared by solid-state reaction. The products were characterized by scanning electron microscopy, X-ray diffraction, and network analyzer. (Mg0.95Mn0.05)2(Ti0.95Sn0.05)O4 has a dielectric constant ([epsilon]r) of ~14.21, a high quality factor (Q×f) of ~347,000 GHz, and a temperature coefficient of resonant frequency (τf) of ~-57.94 ppm/°C. To produce a temperature-stable material, (Ca0.6La0.8/3)TiO3, which has a large positive τf value of +212 ppm/°C, was added to 0.65(Mg0.95Mn0.05)2(Ti0.95Sn0.05)O4-0.35(Ca0.6La0.8/3)TiO3 has an excellent combination of microwave dielectric properties: [epsilon]r ~24.88, Q×f ~133,000, and τf = 0 ppm/°C sinter at 1325°C, and can be utilized in the fabrication of microwave devices.