Abstract
Several paramagnetic iron compounds with spin S=1/2 are known to exist(1–4) in contrast to the more common high spin iron materials which have spin S=5/2 even though there are five valence electrons associated with the iron ion in each case. These low spin iron compounds can exhibit paramagnetic hyperfine structure (PHS) in Mössbauer spectra under the proper conditions (5) and the shape of the spectrum can provide information about the spin and charge distribution even in randomly oriented absorbers. The low spin situation arises when the energy separation 10Dq between the t2g (or dE) and eg (or dy) states becomes larger than the repulsion between electrons in the same orbital. Then (assuming octahedral coordination) it is energetically favorable for the electrons in the eg states to flip their spins and occupy the t2g orbitals leaving fewer unpaired electrons — hence the “low spin” configuration. We will be discussing those iron materials which have only a single unpaired electron per atom and therefore a net spin of one half.
Supported in part by the National Science Foundation and the Office of Naval Research
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Oosterhuis, W.T. (1971). Paramagnetic Hyperfine Structure in Iron Complexes with Effective Spin S=l/2. In: Gruverman, I.J. (eds) Mössbauer Effect Methodology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9002-6_6
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