Synthesis and Characterization of Single CrystalsY_3Fe_5O_(12)andBi_3Fe_5O_(12)Prepared via Sol Gel Technique

摘要

Magnetic properties of nano-crystalline yttrium iron garnet, Y_3Fe_5O_(12)and bismuth irongarnet, Bi_3Fe_5O_(12)were studied. The samples synthesized by using sol gel route. The wereprepared using nitrates of yttrium and iron for the yttium iron garnet (YIG) and nitrates of bismuthand iron for the bismuth iron garnet (BIG). The raw materials were mixed and dissolved in citricacid and were stirred for 3 months in room temperature until the gel was observed. The X-raydiffraction pattern reveals the cubic structure of YIG and BIG samples at 700°C and 500°Crespectively. From the M-H diagrams it was found that the YIG and BIG samples have saturationmagnetization, Ms of 27.2 Gs with rectangular hysteresis loop and 24.4 Gs with S hysteresis loop,respectively. It is evident from the FESEM micrographs that the rectangular loop shape (YIG) arisesfrom the homogeneous and rounded microstructure as compared to the inhomogenous and randomorientation microstructure (BIG) of the samples. From the Electron diffraction done onTransmission Electron Microscope, both of the samples were shown to be single crystals.