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The comparative study of the substitution of zinc and lithium for iron in the"114" ferrites, YBaFe4O7 and CaBaFe4O7, shows that these diamagnetic cationsplay a major role in tuning the competition between ferrimagnetism and magneticfrustration in these oxides. The substitution of Li or Zn for Fe in the cubicphase YBaFe4O7 leads to a structural transition to a hexagonal phaseYBaFe4-xMxO7, for M = Li (0.30 < x < 0.75) and for M = Zn (0.40 < x < 1.50). Itis seen that for low doping values i.e. x = 0.30 (for Li) and x = 0.40 (forZn), these diamagnetic cations induce a strong ferrimagnetic component in thesamples, in contrast to the spin glass behaviour of the cubic phase. In all thehexagonal phases, YBaFe4-xMxO7 and CaBaFe4-xMxO7 with M = Li and Zn, it is seenthat in the low doping regime (x ~ 0.3 to 0.5), the competition betweenferrimagnetism and 2 D magnetic frustration is dominated by the average valencyof iron. In contrast, in the high doping regime (x ~ 1.5), the emergence of aspin glass is controlled by the high degree of cationic disorder, irrespectiveof the iron valency.

Geometric and disorder -- type magnetic frustration in ferrimagnetic "114" Ferrites: Role of diamagnetic Li+ and Zn2+ cation substitution