Abstract: The high purity and good crystallinity tetragonal barium titanate (BT) nanopowders were prepared by oxalate co-precipitation assisted by microwave method using tetrabutyl titanate and barium nitrate as the main raw materials.The structure, diameter and profile of the nanopowders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM).The results show that under the condition that the mole ratio of barium and titanium is 1, the microwave reaction is at 80 ℃ for 30 min, the calcination reaction is at 700 ℃ for 1 h and with the addition of surface active agent (OP-10), barium titanate (BT) nanopowders with a diameter of about 50 nm and c/a ratio of 1.0069 can be prepared.The microwave temperature and microwave time can affect the tetragonality of barium titanate nanopowders significantly.

Key words: The high purity and good crystallinity tetragonal barium titanate (BT) nanopowders were prepared by oxalate co-precipitation assisted by microwave method using tetrabutyl titanate and barium nitrate as the main raw materials.The structure, diameter and profile of the nanopowders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM).The results show that under the condition that the mole ratio of barium and titanium is 1, the microwave reaction is at 80 ℃ for 30 min, the calcination reaction is at 700 ℃ for 1 h and with the addition of surface active agent (OP-10), barium titanate (BT) nanopowders with a diameter of about 50 nm and c/a ratio of 1.0069 can be prepared.The microwave temperature and microwave time can affect the tetragonality of barium titanate nanopowders significantly.