Sintering behaviors, microstructure and dielectric properties of Ce0.5Nd0.5O1.75 ceramic at microwave frequencies

A new temperature-stable Ce 0.5 Nd 0.5 O 1.75 ceramics were synthesized by the conventional solid-state reaction method, and its sintering characteristic, microstructure and dielectric properties were investigated. All the prepared samples possessed the same body-center structure and belonged to the Fm-3 m space group. The shift of angular position of the diffraction peak reflected the change of crystal structure of crystal structure at different temperature. With the increasing of sintering temperature, the density ( ρ ), quality factor value ( Q f ), temperature coefficient ( τ f ) and dielectric constant ( ε ) increased first and then decreased, and reached the peak value at 1400 °C. It indicated that the dielectric properties of Ce 0.5 Nd 0.5 O 1.75 ceramics had a strong dependence on sintering behavior. Considering the relative density was higher than 95% and the stable polarizability structure of Ce 0.5 Nd 0.5 O 1.75 ceramics, dielectric properties of ceramics were mainly affected by porosity and grain size. Under the condition of sintering temperature at 1400 °C for 4 h, the microwave characteristics of the specimen were as follows: a moderate Q f ~ 23,570 GHz, a low permittivity ε value ~ 20.45 and the negative τ f value ~ − 23.4 ppm/ °C.