Microstructures and microwave dielectric properties of (1???y)Nd1?xYbx(Mg0.5Sn0.5)O3–yCa
文摘
The (1???y)Nd1?xYbx(Mg0.5Sn0.5)O3–yCa0.8Sr0.2TiO3 ceramics were prepared by the conventional solid-state method. The X-ray diffraction patterns of the Nd1?xYbx(Mg0.5Sn0.5)O3 ceramics revealed that Nd1?xYbx(Mg0.5Sn0.5)O3 is the main crystalline phase, which is accompanied by a little Nd2Sn2O7 as the second phase. An apparent density of 6.87?g/cm3, a dielectric constant (? r ) of 19.48, a quality factor (Q?×?f) of 117,300?GHz, and a temperature coefficient of resonant frequency (τ f ) of ?1?ppm/°C were obtained when the Nd0.96Yb0.04(Mg0.5Sn0.5)O3 ceramics were sintered at 1,600?°C for 4?h. The temperature coefficient of resonant frequency (τ f ) increased from ?1 to ??ppm/°C as y increased from 0 to 0.6 when the (1???y)Nd0.96Yb0.04(Mg0.5Sn0.5)O3–yCa0.8Sr0.2TiO3 ceramics were sintered at 1,600?°C for 4?h. 0.4Nd0.96Yb0.04(Mg0.5Sn0.5)O3-.6Ca0.8Sr0.2TiO3 ceramic that was sintered at 1,600?°C for 4?h had a τ f of ??ppm/°C.