MOSSBAUER SPECTROSCOPY STUDY OF CRYSTALLIZATION OF AMORPHOUS IRON (III) FLUORIDES: INFLUENCE OF EXPERIMENTAL CONDITIONS.

Article abstract of DOI:10.1016/0038-1098(87)90484-4

Isothermal and non-isothermal treatments were performed on amorphous fluorides vapor-deposited FeF//2 and FeF//3, xHF (0. 4 less than x less than 1. 0) obtained by a soft chemistry reaction. They crystallize in rhombohedral and/or hexagonal tungsten bronze type phases, evidenced by Mossbauer spectroscopy and X-ray diffraction. The influence of the experimental parameters is discussed: heating modes and pressure. It is concluded that the 'ideal' amorphous FeF//3 crystallizes in the rhombohedral form.