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Ni0.5−0.5xZn0.5−0.5xMgxFe2O4 and Ni0.4Zn0.6−2xLixFe2+xO4 ferrites (x = 0.05, 0.10, and 0.15) were prepared and examined. Both systems after sintering showed a pure spinel phase and a uniform grain size and the lattice constants declined slightly as the amount of the Mg2+ and Li+ dopants increased. The average grain sizes of the Ni0.5−0.5xZn0.5−0.5xMgxFe2O4 ferrites appeared to show little variation...
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