  The superconductivity in Na0.3Co1-xMxO2.1.3H2O and the charge ordering in
Na0.5Co1-xMxO2 have been investigated for M = Mn and Ti substituting for Co. We
have first successfully synthesized the single-phase Na0.7Co1-xMxO2(M= Mn and
Ti) materials with 0 < = x < = 0.1, then we obtained Na0.5Co1-xMxO2 (0 < = x <
= 0.1, M = Mn and Ti) by Na deintercalation and Na0.3Co1-xMxO2.1.3H2O (0 < = x
< = 0.1, M = Mn and Ti) by an additional water intercalations. X-ray
diffraction measurements revealed that all samples are single-phase materials,
their lattice parameters depend systematically on the Ti and Mn contents.
Measurements of physical properties indicate that the superconductivity in
Na0.3Co1-xMxO2.1.3H2O is suppressed evidently by Co-site doping and killed at x
= 0.02 for Mn doping and x = 0.01 for Ti doping. Charge ordering and magnetic
properties in Na0.5Co1-xMxO2 were also influenced by M-atom doping.
