| Abstract: | X-ray amorphous phases in rust The sum of the crystalline phases found during a quantitative X-ray analysis of rust is always below 100%. An attempt was therefore made to identify amorphous phases in several characteristic Of different types Of rust; to this end a combination was used of quantitative phase analysis by X-rays and chemical extraction. Rust from industrial, forest and lake environments does not contain amorphous components. The crystalline deficit found during phase analysis is due to lattice distorsions in the crystalline Phase α-FeOOH, γ-FeOOH and Fe3O4; the distorsions are greatest in the α-phase and smallest in Fe3O4. Rust from water ducts and maritime environments sometimes contains X-ray amorphous components. It is possible, however, that these components are formed only by the treatment Of rust samples in the air and that rust of this type does not contain any amorphous phase in its original environment. |
