Synthesis and dielectric properties of textured SrBi2Nb2O9 ceramics via laser rapid solidification

Textured poly-crystalline SrBi2Nb2O9 (SBN) with a preferred 〈0 1 0〉 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 μm 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.

► For the first time, textured SrBi2Nb2O9 was prepared via laser rapid solidification.
► The preferred orientation was along the b-axis direction or 〈0 1 0〉 plane.
► The directional solidification resulted in the textured structure.
► The shortest b-axis length determined the preferred orientation direction.
► More textured ceramics may be synthesized by increasing the content of volatile raw material.