Preparation of textured Ba2NaNb5O15 ceramics by templated grain growth

Acicular Ba2NaNb5O15 (BNN) single crystals were synthesized by the reaction of BaCO3 and Nb2O5 in molten NaCl at 1200 °C for 4 h. Using these single crystals as seeds and V2O5 as additive, textured BNN ceramics were successfully prepared via templated grain growth (TGG). The degree of grain orientation for textured BNN ceramics increased with sintering temperature and reached 80.1% texture degree at 1300 °C. Most of the rod-like grains arranged along the tape-casting direction at higher temperature since the seeds grew at the expense of fine-grained matrix grains.