Investigation of mechanical and electrical properties of Li doped sodium niobate ceramic system

ABSTRACT

The Na_0.96Li_0.04NbO₃ ceramic solid solution was prepared by means of a two-stage hot-pressing technology. The X-ray diffraction analysis showed the formation of a single perovskite phase with an orthorhombic symmetry in the investigated composition. The microstructure and EDS measurements were performed. They confirmed the high purity and the expected qualitative composition. A good homogeneity of the microstructures and a small degree of porosity were observed. The elastic modulus (the Young's modulus E, shear modulus G, and Poisson's ratio ν) of Na_0.96Li_0.04NbO₃ were determined with the use of an ultrasonic method. The electrical properties of Na_0.96Li_0.04NbO₃ ceramics were investigated at the frequency ranging from 0.5 kHz to 200 kHz, and the temperature ranging from room temperature to 750 K. The test sample shows a dielectric dispersion.

KEYWORDS:

• Na_0.96Li_0.04NbO₃ solid solutions
• dielectric properties
• elastic properties