Abstract
Magnesium-aluminum-iron layered hydroxides with hydrotalcite-like structure have been synthesized, and their chemical composition and crystal lattice parameters have been elucidated. Thermal decomposition of the iron-containing layered hydroxides has been studied by X-ray diffraction, thermogravimetry, and IR spectroscopy; the decomposition starts with loss of interlayer water, followed by dehydroxylation of metal hydroxide layers and decomposition of anions at higher temperature. Onset of the both decomposition stages has been shifted to lower temperature with increasing iron fraction in the sample. Magnesium-aluminum-iron hydroxides restore their structure after annealing and subsequent rehydration.
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