جستجوی مقالات مرتبط با کلیدواژه « فریت اسپینلی استرانسیوم » در نشریات گروه « فیزیک »

In this paper, strontium spinel ferrite (SrFe2O4) nanoparticles were prepared by sol-gel method. Also, in order to the effect of sintering time on the structural, magnetic and dielectric properties of SrFe2O4 nanoparticles, first, the gel of the metal nitrates with certain molar ratio prepared and then the prepared powders were calcined at 700 ℃ with different times. The results of XRD show that the main phase of SrFe2O4 increase by increasing sintering times. Also, the FESEM images of the samples show that the particles of SrFe2O4 are homogeneous, but as the samples have magnetic properties, thus agglomeration of them have been occurred. The results of the samples FT-IR show that the sites of tetrahedral and octahedral which are important properties of ferrites were formed. The magnetic properties of the samples show that by increasing the sintering time, the amount of Ms and Hc has been increased which these changes are due to the distribution of ions and shape anisotropy of the nanoparticles. The results of the measurements of dielectric of the samples show that the both ε and for the samples decrease rapidly with increasing applied field frequency, while the ac electrical conductivity has been increased.