• Neutron diffraction and optical studies of the ionic ferromagnet Rb2CrCl4 doped with Mg2+, V2+ and Fe2+

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    • Keywords


      Neutron diffraction; ferromagnet; doped Rb2CrCl4

    • Abstract


      Powder and single crystal neutron diffraction and optical spectroscopy are used to study the effect of substituting non-magnetic (Mg2+) or magnetic (V2+, Fe2+) cations on the Cr2+ sites in the ionic ferromagnet Rb2CrCl4. Comparison of powder neutron diffraction of Rb2CrCl4 and Rb2Cr0-73Mg0-27Cl4 shows that the latter still exhibits long range order at 4·2 K with the moments parallel to the basal plane. single crystal neutron diffraction shows that substituting 11% Mg2+ lowers the Curie temperature by 19% and 3% V2+ lowers it by 6%. Analysis of satellite fine-structure near the exciton-magnon hot bands in the visible absorption spectra of crystals of Rb2CrCl4 doped with V2+ and Fe2+ leads to estimates of 6·6 K and 5·2 K for the Cr2+-V2+ and Cr2+-Fe2+ exchange constants.

    • Author Affiliations


      P J Fyne1 M T Hutchings2 P Day1

      1. Inorganic Chemistry Laboratory, Oxford University, South Parks Road, Oxford - OX1 3QR, England
      2. Materials Physics Division, AERE Harwell, Didcot, Oxon - OX11 ORA, England
    • Dates

  • Journal of Chemical Sciences | News

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