THE EFFECT OF CTAB SURFACTANT ADDITION AND ADDITIONAL Sr ON PHASE FORMATION AND MAGNETIC PROPERTIES OF NANOSIZED SrFe۱۲O۱۹ SYNTHESIZED VIA SOL-GEL AUTO- COMBUSTION METHOD

trontium hexaferrite (SrFe ۱۲ O ۱۹ ) nanosized powders were synthesized by sol-gel auto-combustion method with and without cetyltrimethylammonium boromide (CTAB) addition in the sol with Fe/Sr ratio of ۱۱ (using additional Sr). The resultant powders were investigated by X-ray Diffraction (XRD), Transmission Electron Microscope (TEM), Field Emission Scanning Electron Microscope (FESEM) and Vibration Sample Magnetometer (VSM) techniques. Phase constituents of the synthesized samples which were heat treated at temperatures in the range of ۷۰۰- ۹۰۰ ◦C were studied. XRD results revealed that CTAB addition facilitates the formation of single phase strontium hexaferrite at ۸۰۰ ◦C. Microstructural evaluations with FESEM represented that CTAB addition causes formation of larger particles with a narrower size distribution. VSM results represented that the highest amount of intrinsic coercivity force ( i H C ) was obtained in the sample without CTAB addition and with additional Sr, calcined at ۸۰۰ ◦C for ۱ h which was equal to ۵۷۴۹.۲۱ Oe, while the value of i H C was equal to ۴۹۵۰.۸۹ Oe without additional Sr. The amount of maximum magnetization (M max ) was raised from ۴۸.۴۱ emu/g to ۶۲.۶۰ emu/g using CTAB and additional Sr. The microstructure and magnetic properties of the samples have been explained

Keywords:

Strontium hexaferrite , sol-gel auto-combustion , surfactant , magnetic properties