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Li–Cr substituted NiZnCu ferrite powder specimens with the nominal composition Ni 0.  25  –2   x  Li  x  Cr  x  Cu 0.15 Zn 0.6 Fe 2 O 4  ( x =0.00, 0.01, 0.02, 0.03, 0.04) were prepared primarily via chemical coprecipitation. X-ray diffractometry, scanning electron microscopy and vibrating sample magnetometry were used to study their structural or magnetic properties. It is found that all the specimens exhibit a single phase after annealing. The variation tendency of saturation magnetization with  x  exhibts a strange variation tendency and can be attributed to the different site occupation of Li + ions. It is also found that suitable Li–Cr substitutions help decrease the annealing temperature.

Li–Cr substituted nickel–zinc–copper ferrite powders: structural and magnetic properties