We studied the physical properties of Ni-Zn ferrites by adding different chemicals such as $SO_4$, Cl, and $NO_3$. Specimens were prepared by the coprecipitation method and sintered at temperatures $950^{circ}C,;1,150^{circ}C,;and;1,350^{circ}C$, respectively. X-ray diffractions showed a spinel structure and the optical microscopy revealed grain size of 0.3 to 0.6 ${mu}m$. The optimum sintering temperature to obtain fine, sintered microstructure depended on the additive : Cl and $NO_3;at;950^{circ}C;and;SO_4;at;1,150^{circ}C$. According to particle size analysis, higher magnetic permeability and magnetization value were observed with Cl and $NO_3;than;SO_4$. As sintering temperature was raised from $950^{circ}C$ to $1,350^{circ}C$, the average grain diameter, initial permeability and the magnetic moment also increased.