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The temperature variations of the ferrous Mössbauer parameters for a synthetic ilmenite (FeTiO 3 ) have been determined and interpreted over a very wide temperature range (5–900 K). The Debye model of the lattice vibrations was used in interpreting the temperature dependence of the center shift, yielding a characteristic Mössbauer temperature of 350 ± 20 K and a zero-Kelvin intrinsic isomer shift of 1.30 ± 0.01 mm/s. The temperature dependence of the ferrous Mössbauer quadrupole splitting was interpreted using crystal feld theory. A most adequate description of the experimental ∆ E  Q ( T ) curve was obtained assuming an energy shift of at the most ca. 500 ± 50 cm –1  for the highest orbital  T  2g  level relative to the lowest level within this  T  2g  triplet. The temperature dependence of the hyperfine field was interpreted within the molecular field theory of magnetism assuming the magnetic exchange energy being a function of interatomic spacing, indicating a first-order magnetic transition at the magnetic-paramagnetic transition temperature of 59.0 ± 0.5 K.

Temperature dependences of the hyperfine parameters of Fe 2+ in FeTiO 3 as determined by 57 Fe-Mössbauer spectroscopy