Synthesis and dielectric properties of textured SrBi_2Nb_2O_9 ceramics via laser rapid solidification

摘要

Textured poly-crystalline SrBi_2Nb_2O_9 (SBN) with a preferred (010) orientation ceramics were synthesized via laser rapid solidification using a CO2 laser. X-ray diffraction analysis reveals that the preferred orientation of the as-obtained SBN is along the b-axis, and the orientation factor is approximately 0.78. Scanning electron microscope image shows that the as-obtained SBN is composed of flake-like grains with maximum thickness and length of 1.0 am and 0.1 mm, respectively, which are parallel to the laser incident direction. The directional solidification produces the textured structure, and the shortest b-axis length determines that the preferred orientation direction is along the b-axis. Dielectric property research demonstrates that the phase transition of the as-obtained SBN is diffuse, which may be due to the orientation array of the grains.