0000000000297397
AUTHOR
Czesław Kuś
Structural and Dielectric Properties of Na0.99Li0.01NbO3Ceramics
Na0.99Li 0,01 NbO3 ceramics were prepared by solid-state reaction method. The samples were characterized by X-ray diffraction, microstructure and dielectric permittivity measurements. The X-ray diffraction analysis showed that samples have a single phase of perovskite structure with orthorhombic symmetry. Microstructure investigations revealed crystalline structures in grains. It was found that dielectric properties of Na99Li0.01NbO3 ceramic are sensitive to the applied axial pressure. This includes the shift of phase transformation, diffuseness of the ϵ (T) profile and reduction of the thermal hysteresis. These effects can be caused by change in domain structure and anisotropy of crystalli…
The structural and dielectric properties of the Na0.96Li0.04NbO3ceramics
Ceramic samples Na0.96Li0.04NbO3 were obtained using ceramic technology. The phase and structural analysis, the microstructure, EDS and EPMA, dielectric and hysteresis loops measurements have been performed. The dielectric and hysteresis loops measurements of Na0.96Li0.04NbO3 have been carried out. The dielectric measurements were performed both without and under axial pressure up to 120 MPa. It was shown that Na0.96Li0.04NbO3 ceramics have orthorhombic symmetry at room temperature and undergo a first order phase transition at a temperature of about 570 K. The axial pressure shifts the phase transition temperature and decreases the hysteresis in field-polarisation and field-strain dependenc…