Ti(3+) in meteoritic and synthetic hibonite

Details Ti(3+) in meteoritic and synthetic hibonite Ti(3+) in meteoritic and synthetic hibonite

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1479b&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, June 1988, p. 1479-1495.

Computer Science

13

Cosmochemistry, Meteoritic Composition, Murchison Meteorite, Titanium, Aluminum, Calcium, Chromium, Electron Paramagnetic Resonance, Iron

Scientific paper

This paper describes the first direct determination (performed by electron spin resonance spectroscopy) of Ti(3+) in hibonite from inclusion SH-7 of the Murchison C2 chondrite and in synthetic hibonites of four compositions, three of which corresponded to the compositions of blue hibonites and one to that of an orange hibonite. The Ti(3+) concentration in the hibonite from SH-7 was found to range from 0.35 to 0.44 percent, while the Ti(3+) contents in three synthetic blue hibonites ranged from 0.02 to 0.64 percent. Orange hibonite contained no Ti(3+), supporting an earlier conclusion that the orange-to-blue transition is associated with the presence of Ti(3+). At constant temperature and oxygen fugacity, the Ti(3+)/Ti(4+) ratio in synthetic hibonites was found to increase with decreasing V, but was not strongly dependent on bulk Ti. Fe and Cr contents did not have a significant effect on the amount of Ti(3+).

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