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An EPR study of Fe3+ in enstatite

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Abstract

The paramagnetic resonance spectrum of light-green natural enstatite, (Mg, Fe2+) [SiO3] shows evidence of Fe3+ in triclinic site symmetry. Only one transition of sufficient intensity could be evaluated with the following Hamiltonian parameters: gxx=4.774, gyy=4.003, gzz=3.723. No hyperfine splitting, was detected. It is suggested that Fe3+ should occupy the more distorted M(2) site. A number of spread signals of very low intensity from 50 to 400 mT can be attributed to other Fe3+ transitions or to Mn2+. The occurrence of a small portion of iron in a trivalent state could be due to either oxidizing conditions during crystal growth or to subsequent ionizing radiation.

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Authors and Affiliations

  1. Physics Department, Solid State Section Athens University, Panepistimiopolis, GR 157, 71, Zografos, Greece

    K. Eftaxias & A. B. Vassilikou-Dova

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  1. K. Eftaxias
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  2. A. B. Vassilikou-Dova
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Eftaxias, K., Vassilikou-Dova, A.B. An EPR study of Fe3+ in enstatite. Appl Magn Reson 1, 457–462 (1990). https://doi.org/10.1007/BF03166026

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