Abstract
The magnetic susceptibility, χ, of a natural single crystal of marcasite, FeS2, has been measured between 300K down to 4K. At room temperature χ=0.3×10−5 emu/g and it is temperature independent down to 10K. Below 10K it increases up to 1.3×10−5 emu/g. It is concluded that iron in marcasite is in the Fe2+ low spin state, and that the 6d electrons occupy the t2g ground state. Consequently iron in marcasite (FeS2) is not magnetic in agreement with our Mössbauer spectra recorded at 4.2K in an external magnetic field up to 39.9 kOe. The small value of χ is explained in terms of contributions from ppm impurities. i.e., diamagnetism and Van Vleck paramagnetism.
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Garg, R., Garg, V.K. & Nakamura, Y. Magnetic properties of iron marcasite FeS2 . Hyperfine Interact 67, 447–451 (1991). https://doi.org/10.1007/BF02398183
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DOI: https://doi.org/10.1007/BF02398183