Comparative study of Aliskerovo, Anyujskij, Sikhote-Alin and Sterlitamak iron meteorites using Mössbauer spectroscopy

Abstract

A comparative study of Sikhote-Alin IIAB, Anyujskij IIAB, Aliskerovo IIIE-an and Sterlitamak IIIAB iron meteorites was carried out using Mössbauer spectroscopy with a high velocity resolution as well as using metallography, scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction. Different numbers of spectral components were found in the Mössbauer spectra of Sikhote-Alin IIAB and Anyujskij IIAB and in the spectra of Aliskerovo IIIE-an and Sterlitamak IIIAB iron meteorites. The values of hyperfine field at the 57 Fe nuclei obtained for spectral components were related to α-Fe(Ni, Co), α 2 -Fe(Ni, Co) and γ -Fe(Ni, Co) phases with variations in Ni concentration.

Applications of Mössbauer Spectroscopy in Meteoritical and Planetary Science, Part II: Differentiated Meteorites, Moon, and Mars

“…The magnetic sextets 1 and 3 were assigned to the octahedral [B] and tetrahedral (A) sites in γ-Fe2O3, respectively (δ = 0.397 mm/s, Heff = 501.1 kOe, A = ~4.8% and δ = 0.277 mm/s, Heff = 483.9 kOe, A = ~10.3%), sextets 2, 4, and 5 were related to the (A), [B1], and [B2] sites in Fe3O4, respectively (δ = 0.332 mm/s, Heff = 494.0 kOe, A = ~13.3%; δ = 0.425 mm/s, Heff = 472.8 kOe, A = ~4.2% and δ = 0.578 mm/s, Heff = 449.0 kOe, A = ~8.5%), sextets 6, 7, and 8 were associated with α-FeOOH magnetic particles with different sizes, respectively (δ = 0.380 mm/s, Heff = 326.4 kOe, A = ~8.5%; δ = 0.316 mm/s, Heff = 253.9 kOe, A = ~9.8% and δ = 0.286 mm/s, Heff = 189.6 kOe, A = ~8.2%), and quadrupole doublets 9, 10, and 11 were assigned to the paramagnetic FeOOH particles, respectively (δ = 0.444 mm/s, ΔEQ = 1.033 mm/s, A = ~15.8%; δ = 0.389 mm/s, ΔEQ = 0.782 mm/s, A = ~2.6%, and δ = 0.390 mm/s, ΔEQ = 0.503 mm/s, A = ~14.1%). The fit of these and other spectra measured with a high velocity resolution in [81][82][83][84] revealed more spectral components compared to that in the low velocity resolution spectra measured in [75]. Synchrotron Mössbauer spectroscopy was applied to study the Tazewell IAB-sLH iron meteorite with a spatial resolution of ~10-20 μm in [43,44].…”

“…A comparative study of iron meteorites Anyujskij IIAB, Sikhote-Alin IIAB, Aliskerovo IIIE-an, and Sterlitamak IIIAB was carried out using Mössbauer spectroscopy with a high velocity resolution in [81,82] The comparison of powdered samples of one fragment of Chinga iron-ung, in which visually different areas (1, 2, 3, 4, and 5) of the saw-cut surface were observed, was done using Mössbauer spectroscopy with a high velocity resolution (4096 channels) in [80]. The Mössbauer spectra of these samples obtained from four areas are shown in Figure 31.…”

“…A comparative study of iron meteorites Anyujskij IIAB, Sikhote-Alin IIAB, Aliskerovo IIIE-an, and Sterlitamak IIIAB was carried out using Mössbauer spectroscopy with a high velocity resolution in [81,82]. The 1024-channel Mössbauer spectra are shown in Figure 33.…”

“…However, these spectra were decomposed with different numbers of components; three magnetic sextets were revealed in the spectra of IIAB iron meteorites, while five magnetic sextets and one paramagnetic singlet were revealed in the spectra of IIIE-an and IIIAB iron meteorites. Therefore, the 57 Fe hyperfine parameters for revealed magnetic sextets were assigned in [81,82] Therefore, the 57 Fe hyperfine parameters for revealed magnetic sextets were assigne in [81,82] 50% (sextet 3, α-Fe(Ni, Co) phase), δ = 0.024 mm/s, Heff = 330.7 kOe, A = 11% (sextet 4, α-Fe(Ni, Co) phase), δ = 0.243 mm/s, Heff = 309.1 kOe, A = 2% (sextet 5, γ-Fe(Ni, Co) phase) and δ = 0.128 mm/s, A = 1% (singlet 6, paramagnetic γ-Fe(Ni, Co) phase) for Sterlitamak IIIAB. It should be noted that there is uncertainty in the assignment of Heff in the range 340-350 kOe to α2-Fe(Ni, Co) or α-Fe(Ni, Co) phases.…”

“…On the other hand, the newly measured spectrum presented in 2048 channels was decomposed with six magnetic sextets. Therefore, the 57 Fe hyperfine parameters for revealed magnetic sextets were assigned in [81,82] to the following phases: (i) δ = 0.010 mm/s, H eff = 342.3 kOe, A = 36% (sextet 1, α-Fe(Ni, Co) phase), δ = −0.015 mm/s, H eff = 332.5 kOe, A = 56% (sextet 2, α-Fe(Ni, Co) phase), δ = 0.083 mm/s, H eff = 330.0 kOe, A = 8% (sextet 3, α-Fe(Ni, Co) phase) for Anyujskij IIAB; (ii) δ = 0.011 mm/s, H eff = 345.1 kOe, A = 19% (sextet 1, α-Fe(Ni, Co) phase), δ = −0.004 mm/s, H eff = 336.5 kOe, A = 40% (sextet 2, α-Fe(Ni, Co) phase), δ = −0.001 mm/s, H eff = 329.7 kOe, A = 41% (sextet 3, α-Fe(Ni, Co) phase) for Sikhote-Alin IIAB; (iii) δ = 0.015 mm/s, H eff = 347.1 kOe, A = 14% (sextet 1, α 2 -Fe(Ni, Co) phase), δ = 0.003 mm/s, H eff = 338.6 kOe, A = 43% (sextet 2, α-Fe(Ni, Co) phase), δ = 0.036 mm/s, H eff = 332.3 kOe, A = 5% (sextet 3, α-Fe(Ni, Co) phase), δ = 0.001 mm/s, H eff = 330.9 kOe, A = 35% (sextet 4, α-Fe(Ni, Co) phase), δ = 0.006 mm/s, H eff = 310.1 kOe, A = 2% (sextet 5, γ-Fe(Ni, Co) phase) and δ = 0.071 mm/s, A = 1% (singlet 6, paramagnetic γ-Fe(Ni, Co) phase) for Aliskerovo IIIE-an; (iv) δ = 0.057 mm/s, H eff = 344.7 kOe, A = 16% (sextet 1, α 2 -Fe(Ni, Co) phase), δ = −0.031 mm/s, H eff = 343.7 kOe, A = 20% (sextet 2, α 2 -Fe(Ni, Co) phase), δ = 0.001 mm/s, H eff = 333.4 kOe, A = 50% (sextet 3, α-Fe(Ni, Co) phase), δ = 0.024 mm/s, H eff = 330.7 kOe, A = 11% (sextet 4, α-Fe(Ni, Co) phase), δ = 0.243 mm/s, H eff = 309.1 kOe, A = 2% (sextet 5, γ-Fe(Ni, Co) phase) and δ = 0.128 mm/s, A = 1% (singlet 6, paramagnetic γ-Fe(Ni, Co) phase) for Sterlitamak IIIAB. It should be noted that there is uncertainty in the assignment of H eff in the range 340-350 kOe to α 2 -Fe(Ni, Co) or α-Fe(Ni, Co) phases.…”