Effect of NaCI on the microstructure and electrical properties of K_(0.5)Na_(0.5)NbO_3 ceramics prepared by cold sintering process

摘要

K_(0.5)Na_(0.5)NbO_3 ceramics are considered as a potential candidate for PZT due to its excellent electrical properties and high Curie temperature. In this work, Cold sintering process (CSP) has been used in preparing the K_(0.5)Na_(0.5)NbO_3-NaCl ceramics. Based on the experimental characterization, utilizing NaCI aqueous solutions as a transient solvent can change the grain microstructure of KNN ceramics, inhibit the volatilization of alkali metal elements, and lower the sintering temperature. As sintering at 900 ℃, the electrical properties of the ceramic were T_c=448 ℃, d_(33)= 115 pC/N, k_p—32%, and the obtained sample had an average grain size of 0.5 um. The results indicate that CSP with NaCI aqueous solutions is an efficient method for low-temperature sintering of KNN ceramics with uniform grain size as well as good performance in electrical properties.