The limiting value of x in the ferromagnetic compositions La1-xMnO3

Studies on a large number of compositions among the ferromagnetic self-doped manganites, La1-xMnO3, show that the ferromagnetic Curie temperature increases with x and reaches a maximum value for x=1/7. Tc remains independent of x for x≥1/7 and the maximum value of the magnetization is obtained for x=1/8. The presence of a second phase, due to Mn3O4, whose contribution increases with x, is observed in the powder x-ray diffraction patterns for x > 1/8 and the lattice parameters remain independent of x for x>1/8. The results indicate that the limiting value of x or the extent of self-doping possible in La1-xMnO3 is x=1/8. (author). Letter-to-the-editor