Mössbauer and Supplementary Studies of Apollo 11 Lunar Samples
Mössbauer studies of Apollo 11 lunar fines (10084,89) and rock (10024) have been carried out over the temperature range 1.8–600°K. The major iron-bearing compounds are pyroxene and ilmenite, while the minor constituents are metallic iron and troilite (FeS1.00). The magnitude and temperature dependences of the isomer shifts and quadrupole splittings observed for the major peaks indicate that only Fe2 + ions are present. At low temperatures, ilmenite undergoes an antiferromagnetic transition and the pyroxene peaks are also split by the hyperfine field arising from a long spin-lattice relaxation time. The results of high-voltage electron microscopy as well as magnetic susceptibility, electron microprobe, and X-ray analysis on these samples are summarized and correlated with the Mössbauer studies.
KeywordsIsomer Shift Quadrupole Splitting Hyperfine Field Metallic Iron Lunar Sample
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