Preparation of potassium sodium niobate in tellurite glass system doped with Er2O3

Abstract

In the present study, potassium sodium niobate (KNN) doped with Er 2O3 in TeO2 glasses were successfully prepared using melting-quenching method. The glass composition of 70KNN-30TeO2 mol% doped with 1 mol% of Er2O3 has been chosen. A batch was subsequently melted at 800°C and 900°C for 30-60 min and heated at the temperature ranging between 300-530°C in order to form the glass ceramics with desired crystal phases. XRD results showed that KNN crystals distributed over the glass-ceramic samples. From SEM observation, it was found that nano-crystals of several phases were precipitated in all glass-ceramic matrices. Dielectric constant increased with increasing heat treatment temperature. © 2014 Taylor and Francis Group, LLC.