Study on nano-crystalline CoTiO_3 synthesized by mechanochemistry

Nano-crystalline CoTiO_3 powder were synthesized by mechanochemistry of high energy ball milling with initial powders of Co_2O_3 and TiO_2.The effects of the different ball milling time,the temperature and time of heat treatment on nano-crystalline CoTiO_3 powder were investigated by using X-ray diffraction patterns and scanning electron microscopy.The experimental results show that the process of high energy ball milling for the mixture of Co_2O_3 and TiO_2 can be divided into formation of amorophous phase (0～2h) and growth of CoTiO_3crystalline grain size (2～6h).Nano-crystalline CoTiO_3 powder with the crystalline grain size 26.3nm can obtain after ball milling 6h. The mixture after ball milling 1h at 550℃ for 1h can also transform into nano-crystalline CoTiO_3 powder with the crystalline grain size 28.7nm.