A Mössbauer investigation of natural troilite from the Agpalilik meteorite

Details A Mössbauer investigation of natural troilite from the Agpalilik meteorite A Mössbauer investigation of natural troilite from the Agpalilik meteorite

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pcm....15..509k&link_type=abstract

Physics and Chemistry of Minerals, Volume 15, Issue 6, pp.509-513

Physics

7

Scientific paper

Troilite close to FeS, with 0.17 weight percent Cr as main impurity, was obtained from the Agpalilik meteorite. Powder Mössbauer spectroscopy was made in the temperature range 77 645 K. The full Hamiltonian was applied in the fittings. Assuming the asymmetry parameter η to be constant on passing from the high-temperature NiAs-type structure to the medium-temperature MnP-type structure yields a quadrupole splitting ( dq=0.5e2 qQ(1+(η2)/3)1/2) value of -0.25(2) mm/s for these phases. In low-temperature troilite | dq|=0.85 mm/s at room temperature. The combinations of (η, θ, φ) in troilite giving identical spectra range from (0, 49°, -) to (1, 45°, 50°) for negative V zz or from (0.3, 57°, 78°) to (1, 58°, 54°) for positive V zz . Assuming a negative V zz and B‖ c gives a θ value in agreement with the shortest Fe-S join being the V zz orientation. The magnetic spin flip of 90° is proposed to occur in the MnP-phase only. The MnP phase-troilite transition occurs at lower temperatures and is more sluggish than in pure FeS.

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