Figure 5: Room-temperature ambient-field Mössbauer spectra.
From: Inferred time- and temperature-dependent cation ordering in natural titanomagnetites
Sample MSH02-G in (a) a relatively disordered state (TC=337 °C) following rapid cooling from 600 °C, and (b) a relatively ordered state (TC=417 °C) produced by annealing at 350 °C for 114 h. The raw data are fit with two sextets to represent the ferromagnetic contribution from the titanomagnetite. For clarity, the two central doublet fits (paramagnetic Fe2+ and Fe3+) are not shown. The A sextet effectively represents the tetrahedral Fe3+, while the B sextet represents the octahedral (and tetrahedral) Fe2.5+ (see Supplementary Methods).
