Physics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...15..313b&link_type=abstract
(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,
Physics
4
Crystallography, Meteoritic Composition, Meteoritic Microstructures, Mineralogy, Aluminum Compounds, Calcium Compounds, Cations, Metal Ions, Mossbauer Effect, Positive Ions, Meteorites, Crystals, Chemistry, Hibonite, Samples, Meteorite, Structure, Enrichment, Cations, Color, Vanadium, Titanium, Mossbauer Spectroscopy, Iron, Spectra, Hypotheses
Scientific paper
The characteristics of cation vacancies and site occupancies of natural hibonites in meteors are discussed. Note is taken of the effect of the specific locations of the hibonites in the matrices on the crystal chemistry, electronic stabilities, and spectral features of the metal ions which replace the Al(3+). Hibonites form beta-alumina hexagonal cells with 26 cation sites. Fe cations are found in octahedral, tetrahedral, and five-fold coordinations. Fe(2+) is found in face-shared Al(3) octahedra, a siting explained in terms of ionic radius and crystal field stabilization energy criteria. Spectral colors are attributed to V(3+) and Ti(3+) field transitions at 400 and 700 nm, respectively, although the 700 nm line may arise from transitions of Ti(3+) to Ti(4+) or Fe(2+) to Fe(3+) during heating. Excesses of Mg-26 can be traced to decay of nebular Al-26.
Burns Roger G.
Burns Virginia Mee
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