Study of iron oxides obtained by decomposition of an organic precursor
1999; Elsevier BV; Volume: 38; Issue: 3 Linguagem: Inglês
10.1016/s0167-577x(98)00154-2
ISSN1873-4979
AutoresJ.A. Matutes-Aquino, Perla E. García‐Casillas, Oscar Ayala-Valenzuela, Sandra García-García,
Tópico(s)Minerals Flotation and Separation Techniques
ResumoIron oxide powders were obtained by the isothermal decomposition of ferric citrate in an oxygen atmosphere at different temperatures. Throughout the experiments, the product of decomposition was a mixture of maghemite (γ-Fe2O3) and hematite (α-Fe2O3) with different relative proportions and particle size distributions. After TGA and DTA measurements, a decomposition temperature of 300°C was chosen, and a maximum specific saturation magnetization of about 40 emu/g was obtained. Most of the product particles were less than 1 μm in size, including a superparamagnetic fraction, as evidenced by Mössbauer spectroscopy.
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