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The study is devoted to the thermal decomposition of the iron oxyhydroxides: γ-FeOOH (lepidocrocite), α-FeOOH (goethite) and Fe 5 HO 8 .4H 2 O (ferrihydrite). The changes in the crystal structure, in the phase composition and in the dispersion degree, occurring during thermal treatment have been followed by means of Mossbauer spectroscopy, X-ray diffraction, infrared spectra,...
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