Anionic Intercalation in La2CuO4 Oxide by Fluorine or Chlorine Treatment

Authors :: Chevalier, B.
Tressaud, A.
Brisson, C.
Dance, J. M.
Etourneau, J.
Tuilier, M. H.
Soubeyroux, J. L.
Cassart, M.
Issi, J. P.
Source :: Molecular Crystals and Liquid Crystals; April 1994, Vol. 244 Issue: 1 p135-142, 8p
Publication Year :: 1994
Abstract: The influence of a halogen-gas (Cl2 or F2) treatment on both structural and physical properties of La2CuO4 has been studied. In all cases, the resulting product contains an excess of anionic species and shows superconducting properties below 32K and 40K respectively for the chlorine-or fluorine-treated sample. But these treatments have a different influence on the evolution of the structural properties comparatively to those observed for the starting oxide after chlorination a decrease of the orthorhombic distortion is detected, whereas an opposite trend is shown after fluorination. The Cl2-gas treatment leads to an oxygen-excess phase La2CuO4.08. whereas the fluorination yields an oxyfluoride La2Cu(O, F)4.17.