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We have investigated the magnetic state of iron in siderite FeCO 3 under high pressure using Kβ x-ray emission spectroscopy. Pressure induced changes in the shape of the iron Kβ emission lines indicate that the iron ground state changes from a low pressure magnetic state to a high pressure non-magnetic state. This transition takes place roughly at 50 GPa. This conclusion is supported by charge transfer multiplet calculations of the iron Kβ emission line.
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Mattila et al. (2007) studied this question.
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