Iron sulfide (troilite) inclusion extracted from Sikhote-Alin iron meteorite: Composition, structure and magnetic properties

Spinels in Meteorites: Observation Using Mössbauer Spectroscopy

“…Additionally, the fusion crust from Chelyabinsk LL5 fragment No 1a and the massive troilite inclusion from the Sikhote-Alin iron meteorite were removed and prepared as a powder for the study. Details of different samples preparation and characterization were described in [9][10][11][12][13][14][15].…”

“…The Mössbauer spectra were measured in transmission geometry with moving absorber in the cryostat and recorded in 4096 channels. To increase the signal-to-noise ratio in the complex spectra with the minor components, they were converted into 1024 channels by consequent summation of four neighboring channels to reach higher statistics and larger signal-to-noise ratio (details for each sample study are given in [9][10][11][12][13][14][15]).…”

“…The unit cell of this daubréelite (cubic spinel structure, space group Fd3m) with parameters a = b = c = 9.98(5) Å is shown in Figure 10b. Adopted from [11].…”

“…Its spectral component has a single-peak shape with the following parameters: Γ = 0.776 ± 0.008 mm/s, δ = 0.584 ± 0.009 mm/s, and A = 2.6(3) %. This single peak disappears in the spectrum measured at 90 K [11] due to the magnetic phase transition and the appearance of a very small magnetic sextet related to daubréelite, extraction of which is very difficult in the spectrum with many overlapped sextets. It is well known that the Mössbauer spectra of daubréelite demonstrate a single peak component only above Curie temperature (see, for instance, [34]).…”

“…However, other results obtained earlier in [36,37] demonstrate similar δ values: ~0.59 mm/s. Adopted from [11].…”