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Geochemical Journal
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Mössbauer study of synthetic calcium-rich pyroxenes

Yoshito Matsui, Yonezo Maeda, Yasuhiko Syono
Geochemical Journal, Vol. 4, No. 1, P. 15-26, 1970

ABSTRACT

In the calcium-rich pyroxenes Fe2+ ion in the M1 positions gives rise to the inner Mössbauer doublet, and Fe2+ in M2 to the outer doublet. The Fe2+-Mg order over the M1 and M2 positions was found unexpectedly weak, being close to the complete disorder at about 1, 200°C. A four-line spectrum was observed in Di50Hd50 prepared by usual sintering technique at 1, 150°C. This may be due to the local disorder of Fe2+ and Ca. The disordered configuration seems to be metastable, and the reaction towards the ordered structure to be extremely sluggish.

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