The sintering of poorly crystalline trigonal iron(III) oxide at temperatures between 200 and 550° was studied by gas adsorption and X-ray diffraction. The surface area was affected at considerably lower temperatures than with finely divided cubic oxide but the main recrystallisation occurred at about the same temperature in both cases. The processes involved are discussed.
B. Molony and M. J. Ridge, J. Chem. Soc. A, 1967, 1631 DOI: 10.1039/J19670001631
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