Effect of Ti doping on the electrical transport and magnetic properties   of layered compound Na0.8CoO2
  Effect of Ti doping on the electrical transport and magnetic properties of layered Na0.8Co1-xTixO2 compounds has been investigated. The lattice parameters a and c increase with x. A minor amount of Ti doping results in a metal-insulator transition at low temperatures. For samples with x > 0.03, the variable-range hopping process dominates the transport behavior above a certain temperature. The temperature dependence of magnetization of all the samples is found to obey the Curie-Weiss law. The mechanism of the doping effect is discussed. 
W. Y. Zhang, Y. G. Zhao, Z. P. Guo, P. T. Qiao, L. Cui, L. B. Luo, X.   P. Zhang, H. C. Yu, Y. G. Shi, S. Y. Zhang, T. Y. Zh...