Effect of Potassium Concentration on the Grain Orientation in Bismuth Sodium Potassium Titanate

Bi 0.5 (Na 1‐ x K x ) 0.5 TiO 3 (BNKT) bulk ceramics with a preferred <100> orientation were prepared using the reactive templated grain‐growth method with platelike Bi 4 Ti 3 O 12 particles as templates for BNKT. The potassium concentration ( x value) had a large effect on the degree of orientation, and highly oriented ceramics were obtained for the specimens with x = 0.10 and x = 0.15, whereas the specimen with x = 0.00 had a small degree of orientation. Increased potassium concentration from x = 0.00 to x = 0.15 decreased the grain‐growth rate and changed the grain shape from irregular to cubic. These factors were responsible for the increased degree of orientation.