Ferrihydrite is the least crystalline of the three Fe-oxides. Its structure is not fully understood, probably it is formed by hexagonally close-packed oxygen planes with Fe in octahedral interstices. The low crystallinity of ferrihydrite is due partly to vacant Fe sites and partly to the replacement of oxygen by H20 or OH. Based on the number of X-ray peaks, the 2-line ferrihydrite can be distinguished from the better-ordered 6-line ferri hydrite.
как корреткно перевести термины - hexagonally close-packed oxygen planes, 2-line ferrihydrite, 6-line ferrihydrite
из контекста как перевести - edge-sharing double-band corner sharingGoethite is thermodynamically the most stable of the three Fe-oxides. It is formed by slow oxidation of Fe(ll) from solution at neutral pH, followed by the nucleation and crystal growth of the Fe(lll) precipitate. The formation of goethite is favored in carbonate rich environments. Goethite is built by an edge-sharing double-band of octahedra, which alternate in orientation and are linked by corner sharing (seeTable 1-1). The tunnels are large enough for protons only. The 0 and OH form hexagonally close-packed layers.