Structural Modulation of Na0.5Bi0.5TiO3 in Hydrothermal Synthesis

In this study, the high-quality cubic-shaped single-crystalline Na0.5Bi0.5TiO3 (NBT) has been successfully synthesized by a hydrothermal method, in which their grain size can be modulated effectively by both mineralizer concentration and reactant concentration. Our result shows that the formation of fine cubic-shaped NBT can be promoted by increasing the mineralizer concentration, while be inhibited by increasing the reactant concentration as a whole. However, further higher mineralizer concentration or lower reactant concentration may lead to a smaller grain size in NBT. From our results, it is suggested that, to synthesize a big single crystalline of NBT, a suitable mineralizer and reactant concentration should be carefully considered. Interestingly, it is also found that the one-dimensional nanostructure may be more inclined to form Na-Ti-O (NT) compounds rather than NBT phase. And the growth mechanism and a possible growth model have been presented. Our result presents a simple and green technical preparation route for the low-cost and high-quality NBT single crystalline with self-designed shape and size.