Synthesis and sodium ionic conductivity for perovskite-structured Na0.25La0.25NbO3 ceramic

In this work, a perovskite-structured sodium ion conductor, Na0.25La0.25NbO3 (NLNO) was developed from analogous Li0.25La0.25NbO3 ceramic. NLNO ceramic was successfully synthesized by solid state reaction. The sodium ionic conduction in Na0.25La0.25NbO3 ceramic was studied and the effect of sintering temperature on the microstructure, phase structure, density and sodium ionic conductivity for Na0.25La0.25NbO3 was also discussed. Single phase of perovskite was successfully obtained from NLNO sintered at 1200 degrees C and 1250 degrees C, and the result shows high sintering temperature leads to a large grain size, large lattice parameters and high density. With an increase of sintering temperature from 1150 degrees C to 1250 degrees C, the conductivity of samples increases gradually. NLNO sintered at 1250 degrees C presents a high sodium ionic conductivity of 1.06 x 10-5 S cm-1 at 30 degrees C, which is much higher than that of electronic conductivity in NLNO sintered at 1250 degrees C.

Automated summary

A perovskite-structured sodium ion conductor, Na0.25La0.25NbO3 (NLNO), was developed and studied for its microstructure, phase structure, density, and sodium ionic conductivity. Higher sintering temperature leads to improved conductivity.