Magnetic properties of NiZr substituted barium ferrite

Single-domain fine particles of NiZr substituted barium ferrite has been synthesized by citrate gel route. The magnetization value obtained are comparable with those observed in Co–Ti substitution. This has been attributed to strong preference of Ni 2+ for octahedral coordination, and no particular preference for Zr 4+ ion. Phase formation at lower temperature permits easy control over the microstructure and hence, a large variation in coercivity (180–4500 Oe) has been possible as a function of x and heat treatment temperature.