Preparation and piezoelectric properties of potassium sodium niobate glass ceramics

This paper describes the preparation of a piezoelectric glass ceramic material from potassium sodium niobate(K0.5Na0.5Nb O3;KNN) using a novel melting method.The effects of the subsequent heat-treatment on the optical,thermal,electrical,and mechanical properties of the material are carefully examined,and its crystal structure and surface morphology are characterized respectively by x-ray diffraction and scanning electron microscopy.This new material has a much higher piezoelectric coefficient(163 p C·N-1) than traditional piezoelectric ceramics(131 p C·N-1).On this basis therefore,a strategy for the future study and development of lead-free KNN-based piezoelectric glass ceramics is proposed.