Influence of Ca_0.8Sr_0.2TiO₃ on the Microstructures and Microwave Dielectric Properties of Nd_0.96Yb_0.04(Mg_0.5Sn_0.5)O₃ Ceramics

Abstract

The influence of Ca_0.8Sr_0.2TiO₃ on the microstructures and microwave dielectric properties of Nd_0.96Yb_0.04(Mg_0.5Sn_0.5)O₃ ceramics were investigated by the conventional solid-state method. The X-ray diffraction peaks of (1-y)Nd_0.96Yb_0.04(Mg_0.5Sn_0.5)O₃-yCa_0.8Sr_0.2TiO₃ ceramic system shifted to higher angles as y increased. The dielectric constant increased from 19.5 to 50.6, the quality factor (Q × f) decreased from 117,300 to 49,500 GHz, and the temperature coefficient of resonant frequency (τ_f) increased from −61 to +57 ppm/°C as y increased from 0 to 0.7 when (1-y)Nd_0.96Yb_0.04(Mg_0.5Sn_0.5)O₃-yCa_0.8Sr_0.2TiO₃ ceramic system sintered at 1600°C for 4h. A 0.4Nd_0.96Yb_0.04(Mg_0.5Sn_0.5)O₃-0.6Ca_0.8Sr_0.2TiO₃ ceramic system that was sintered at 1600°C for 4 h had a dielectric constant of 38.2, a quality factor (Q × f) of 53,500 GHz, and a temperature coefficient of resonant frequency of −3.3 ppm/°C.

Keywords:

• Ceramics
• X-ray diffraction
• dielectric constant
• quality factor
• temperature coefficient of resonant frequency