H Ahsbahs

Publications (1)2.17 Total impact

• Source

  Available from: minsocam.org

  Article: 57 Fe nuclear forward scattering of synchrotron radiation in hedenbergite CaFeSi 2 O 6 at hydrostatic pressures up to 68 GPa

  L Zhang, J Stanek, S S Hafner, H Ahsbahs, H F Gr Nsteudel, J Metge, And R R Ffer
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  ABSTRACT: The 57 Fe nuclear forward scattering (NFS) of synchrotron radiation and the use of dia-mond anvils with helium as pressure medium allowed study of the electronic state of Fe 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 Mössbauer 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 Néel temperature T N of hedenbergite depends critically on pressure (T N 45 K at 1 atm).
  American Mineralogist ; 84:447-453. · 2.17 Impact Factor