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