Preferential X-ray line Broadening and Thermal Behavior of γ-Fe2O3 |
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| Authors: | Julian Morales José L Tirado Concepción Valera |
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| Affiliation: | Departamento de Quimica Inorgádnica e lngenieria Quimica, Facultad de Ciencias, Universidad de Cóbrdoba, Cóbrdoba, Spain |
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| Abstract: | Preferential X-ray line broadenings in γ-Fe2o3 samples prepared from γ-FeOOH, α-FeOOH, N2H5Fe(N2H3-COO)3-H2O, FeOOCH3, and colloidal Fe3O4 are compared. Isotropic size and small crystallites are the origin of the uniform and enhanced X-ray line broadening in samples derived from hydrazinate and colloidal Fe3O4. Nonuniform line broadening in ex-α-FeOOH and ex-γ-FeOOH is due to an elongated crystallite shape and the presence of stacking faults, respectively. The thermal behavior of samples with low crystallite size and uniform line broadening is characterized by an exothermal recrystallization process simultaneous to the phase transformation γ-Fe203→α-Fe2O3. |
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| Keywords: | iron oxide X-ray diffraction thermal properties crystallization colloids |
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