Na atomic order, Co charge disproportionation and magnetism in NaxCoO2 for large Na contents H. Alloul, I. R. Mukhamedshin, G. Collin and N. Blanchard EPL, 82 1 (2008) 17002 Published online: 04 March 2008 DOI: 10.1209/0295-5075/82/17002