Crystallization Phenomenon in Defective Goethites

• Dora Canetti de las Cuevas Departamento de Química Inorgánica
• José Raúl Correa Reina Departamento de Química General
• Julio César Llópiz Yurell Laboratorio de Química de Materiales, IMRE. Facultad de Química, Universidad de la Habana. Zapata y G. Habana

Resumen

Samples of iron oxihydroxides were synthesized from Fe2(SO4)3 and NaOH at room temperature followed by steam treatment in 1 M KOH for several intervals of time. The crystallinity variation of the goethite in function of ageing was studied by means of Infrared Spectroscopy, XRD and DTA. The product of dehydration, Fe2O3, maintains the defect structure up to a temperature between 580 to 725°C where an exothermic effect is observed in the DTA due to stress relief and recrystallization