بررسی نقش ریزساختار بر ویژگی های مغناطیسی فریتهای نرم Ni-Zn تهیه شده از اکسید آهن اصلاح شده مجتمع فولاد مبارکه

In th is work, permeabi lity variation of Ni and Ni-Zn ferrites due to microstracture is slud id. The conventional wet ceramic techniqe was used for the preparation of the sampla. The samples were shaped in the form of toroids and disks and were sintered in differant tempraturees. using a LCR-meter, inductance of loroid'i was macsured and tben pennaebility was calculated. To see the relation between grain sise and permaebility. a series of SEM photographs were obtained. The results of these photographs shows that with increasing the si ntering temperature the mean size of grans will increase. In the o ther hand, the magnetic measu rement on toroid samples show that with increasing the mean size of grain the magnetic premeability increases, bUI Ihis procedure will nOI continue and then it falls. The reason of this behavior is describe based on displacing of grain boundaries so that the porosities faU in the grains