L. Zhang, J. Stanek, S. S. Hafner, H. Ahsbahs, H. F. Gruensteudel, J. Metge, R. Rueffer; 57 Fe nuclear forward scattering of synchrotron radiation in hedenbergite CaFeSi 2 O 6 at hydrostatic pressures up to 68 GPa. American Mineralogist ; 84 (3): 447–453. doi: https://doi.org/10.2138/am-1999-0329
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The 57 Fe nuclear forward scattering (NFS) of synchrotron radiation and the use of diamond anvils with helium as pressure medium allowed study of the electronic state of Fe (super 2+) in the chain silicate hedenbergite CaFeSi 2 O 6 at pressures up to 68 GPa. Characteristics of NFS time spectra were compared with those of conventional Mossbauer spectra. NFS time spectra of 57 Fe in hedenbergite revealed a reversible phase transition between 53 and 68 GPa at room temperature, which is probably a transition from the paramagnetic phase at low pressures to a magnetic phase at high pressures. If this interpretation is correct, the Neel temperature T N of hedenbergite depends critically on pressure (T N = 45 K at 1 atm).