Author/Authors :
P.M. Sousa، نويسنده , , A.V. Gir?o، نويسنده , , M.E. Melo Jorge، نويسنده , , M.D. Carvalho، نويسنده , , F.M. Costa، نويسنده , , R.P. Borges، نويسنده , , M.M. Cruz، نويسنده , , M. Godinho، نويسنده ,
Abstract :
Ca4Mn3−xCrxO10 compounds were synthesized in order to investigate the role of an isoelectronic substitution in the layered manganite. Induced structural changes are mainly described as a distortion of the two types of octahedra in the n=3 RP structure. The results indicate that Cr3+ is not the only significant valence state for chromium ions. Electrical and magnetic characterization allow to conclude that chromium does not favour the double exchange mechanism in these compounds.
