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- W2019465680 abstract "SUMMARYThe thermal decomposition of lepidocrocite in air has been studied by X–ray powder diffraction, IR spectroscopy, transmission electron microscopy and N2 adsorption isotherms. Three consecutive processes may be differentiated with increasing temperature: (a)<200°C; no structural change is observed, but a surface dehydration gives rise to an increase in surface area besides a change of mesopore shape from cylindrical to slit–shaped, (b)200–300°C; the maghaemite phase is obtained with a high increase in surface area mainly due to the formation of micropores, because of water losses from inner positions that produce lattice disruption, and (c)≥ 350°C; the transformation of maghaemite to haematite takes place decreasing the specific surface area as the temperature increased. At 450°C microporosity is destroyed and a change of slit–shaped to cylindrical mesoporosity is observed. Porosity dissappeared at ≥600°C, mainly due to interparticle sintering which produces well crystallized haematite samples of low surface area." @default.
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- W2019465680 date "1988-06-01" @default.
- W2019465680 modified "2023-09-26" @default.
- W2019465680 title "Evolution of porosity and changes in heat treated lepidocrocite" @default.
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- W2019465680 doi "https://doi.org/10.1111/j.1365-2389.1988.tb01213.x" @default.
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