The magnetic properties of BiY2Fe5O12 nanoparticles doped with Cr ions

BiY2CrxFe5–xO12 (x = 0, 0.05, 0.1, 0.2, 0.3) nanocrystals were synthesized by using a sol-gel method. Samples were characterized by the powder X-ray diffraction (XRD), the thermal gravity analysis (TGA) and the differential thermal analysis (DTA), the vibrating sample magnetometer(VSM) and Mo¨ssbauer spectrums. The average sizes of the particles were determined by the Scherrer’s formula. The special Ms and Mo¨ssbauer spectra of BiY2CrxFe5–xO12 nanocrystals are researched at room temperature. It is seen that the special Mss of samples are initially increased with increasing Cr3+ content (x < 0.1), and decreased with increasing content of Cr3+ ions (x > 0.1).