Mossbauer Effect and High-Voltage Electron Microscopy of Pyroxenes in Type B Samples

Details Mossbauer Effect and High-Voltage Electron Microscopy of Pyroxenes in Type B Samples Mossbauer Effect and High-Voltage Electron Microscopy of Pyroxenes in Type B Samples

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..686f&link_type=abstract

Science, Volume 167, Issue 3918, pp. 686-688

Physics

2

Scientific paper

Site occupancy numbers for ferrous iron, magnesium, and calcium at the M1 and M2 sites in lunar clinopyroxenes are estimated from nuclear gamma-ray resonant absorption spectra of 57Fe. The cation distribution is ordered; calcium and magnesium prefer M2 and M1, respectively. The distribution corresponds to an equilibrium at a temperature lower than 680 circC. Crystals cleaved and sectioned by diamond-knife ultramicrotomy were examined by high-voltage (200 kv) electron microscopy and diffraction. Uniform 300- to 600-Å-wide bands that correspond to single crystal domains were found. Correlation of the bands with magnetic ordering at low temperatures is considered.

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