Hydrothermal synthesis of Fe₃O₄ particles with various shapes

抄録

Magnetite (Fe₃O₄) particles with various shapes have been synthesized through a simple hydrothermal reaction. The experimental results reveal that the control of the morphology and size of magnetite particles could be realized by adjusting reaction parameters. The diamond-like and prism-shuttle-like magnetite particles with micro-size are obtained by using Fe₃O(OCOCH₃)₆NO₃ and FeCl₂·4H₂O as iron sources. The rod-like and spherical magnetite particles with nano-size are obtained by using Fe₃O(OCOCH₃)₆NO₃ and FeSO₄·7H₂O as iron sources. Ethylenediamine and hydrazine are used as organic bases. The particle size changed from micro-size to nano-size when FeSO₄·7H₂O was used as the starting material instead of FeCl₂·4H₂O. The growth mechanism of magnetite particles also is discussed. The magnetic properties of all magnetite particles exhibit ferromagnetic behavior according to the magnetic hysteresis curve measured at 5 K.