Synthesis of cerium oxalate hydrate by precipitation technique under external magnetic field

Cerium oxalate hydrate particles were synthesized by precipitation technique under external magnetic field with respective intensities of 0,0.1,0.3,and 0.6 T.The particle morphologies were investigated by scanning electron microscopy(SEM)and transmission electron microscope(TEM).Results show that external magnetic field has a great influence on the growth behavior of cerium oxalate hydrate particles.Rod-like and plate-like cerium oxalate hydrate particles with smaller size are formed without the applying of external magnetic field.However,the extremely big rod-like particles with the average size of 12.47μm were prepared under external magnetic field of 0.6 T.The increasing magnetic field intensity makes the grain grow quickly.Thermogravimetric analysis supports the presence of 8.5 H_(2)O molecules associated with cerium oxalate.Further,the growth mechanism of cerium oxalate hydrate under external magnetic field was briefly discussed.