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

In this study, the high‐quality cubic‐shaped single‐crystalline Na 0.5 Bi 0.5 TiO 3 ( 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.