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ABSTRACT From the magnetic phase diagrams established for Lnl.xAExMnO 3 manganites with x>0.5, it is shown that the magnetoresistance is only obtained for compositions of smallest average Asite cations . The magnetic structure study reveals that the small favors the coexistence of ferromagnetism with G-type antiferromagnetism. It is also shown that ferromagnetism can be induced in the Ln 2.xAExMnO 4 type electron doped manganites by using compositions with small Ln and AE cations and x values close to 1.90. Finally, manganse site doping by Cr, Co, Ni can be used to weaken the charge-ordering of the Mn4+ rich perovskite manganites (0.50.5. The CMR compositions are delimited by horizontal arrows in the upper part. For x>0.8 in SmlCaxMnO 3, the CO signature, consisting of super lattice reflexions in the ED patterns registered at 92K, is no more observed, and for 0.86

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