Effect of Mg substitution on structure and magnetic properties of Ni_0·25Cu_0·3Zn_0·45Fe₂O₄ ferrites synthesised by NaOH coprecipitation method

Structural and magnetic properties of Ni0.15Mg0.1Cu0.3Zn0.45Fe2O4 ferrite prepared by NaOH-precipitation method

“…When T a is 700 • C, the sintering density of the sample is the largest, but its average grain size is the smallest, so the M s is still smaller than that of T a = 500 and 600 • C samples. For the sample of T a = 800 • C, abnormal growth of grains takes place and M s decreases rapidly, which should be attributed to the decrease of sintering density [19] and too much pores destroy the interior structure of sintered bulk.…”

“…However the lower Curie temperature of Mg-Cu-Zn ferrites compared with Ni-Cu-Zn ferrites limited its application at elevated temperatures. In order to obtain both high permeability and Curie temperature, Mgcontained NiCuZn ferrites should be good candidates for further miniaturization of electronic devices [19].…”