Abstract
We have investigated the magnetic state of iron in sideriteFeCO3 under highpressure using Kβ x-ray emission spectroscopy. Pressure induced changes in the shape of the ironKβ emission lines indicate that the iron ground state changes from a low pressure magneticstate 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 ironKβ emission line.
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