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A convenient method for measuring ferric iron in magnesiowustite (MgO-Fe1-xO)

Dobson, DP; Cohen, NS; Pankhurst, QA; Brodholt, JP; (1998) A convenient method for measuring ferric iron in magnesiowustite (MgO-Fe1-xO). AM MINERAL , 83 (7-8) 794 - 798.

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Abstract

We present a new oxybarometer for magnesiowustite-bearing systems, which is easily applied using widely available techniques. A scale relating the proportion of Fe3+ [alpha = Fe3+/(Fe3+ + Fe2+)] to the position of the (220) reflection and total Fe (y) in magnesiowustites (Mg1-y. Fe-y)(1-x)O has been derived from measured values in samples equilibrated at various oxygen fugacities:alpha = 13.0047 - 39.4829f + 40.0540f(2) - 13.5701f(3)(+/-0.007 + 0.09 alpha),f = (d(220) - 1.4890)/(0.0510y + 00206y(2))(+/-0.0001).Previously established partition coefficients can then be used to relate estimated Fe3+ content to equilibrium oxygen fugacity (f(O2)) in the composition range 0 < y < 0.2. Equilibrium oxygen fugacities of log f(O2) less than or equal to -1.7 can be estimated to +/-0.5 log units using just X-ray powder diffraction and electron microprobe analytical techniques.

Type: Article
Title: A convenient method for measuring ferric iron in magnesiowustite (MgO-Fe1-xO)
Keywords: WUSTITE
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/140507
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