Synthesis and Characterization of Single Crystals Y&lt;sub&gt;3&lt;/sub&gt;Fe&lt;sub&gt;5&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt; and Bi&lt;sub&gt;3&lt;/sub&gt;Fe&lt;sub&gt;5&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt; Prepared via Sol Gel Technique

Noorhana Yahya,Krzysztof Koziol,Mohd Kamarulzaman Bin Mansor

doi:10.4028/www.scientific.net/ddf.283-286.406

Synthesis and Characterization of Single Crystals Y3Fe5O12 and Bi3Fe5O12 Prepared via Sol Gel Technique

Noorhana Yahya, Krzysztof Koziol + Show 1 more

Open Access

https://doi.org/10.4028/www.scientific.net/ddf.283-286.406

Copy DOI

Abstract

Magnetic properties of nano-crystalline yttrium iron garnet, Y3Fe5O12 and bismuth iron garnet, Bi3Fe5O12 were studied. The samples were synthesized by using sol gel route. The gel were prepared using nitrates of yttrium and iron for the yttium iron garnet (YIG) and nitrates of bismuth and iron for the bismuth iron garnet (BIG). The raw materials were mixed and dissolved in citric acid and were stirred for 3 months in room temperature until the gel was observed. The X-ray diffraction pattern reveals the cubic structure of YIG and BIG samples at 7000C and 5000C respectively. From the M-H diagrams it was found that the YIG and BIG samples have saturation magnetization, 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) arises from the homogeneous and rounded microstructure as compared to the inhomogenous and random orientation microstructure (BIG) of the samples. From the Electron diffraction done on Transmission Electron Microscope, both of the samples were shown to be single crystals.

Highlights

Magnetic garnet, namely, yttrium iron garnet (Y3Fe5O12) and bismuth iron garnet (Bi3Fe5O12) that belongs to a group of magnetic oxides, is an attractive material for magneto-optical devices
It was found that amorphous-gel-to-crystalline phase transition of yttrium iron garnet was formed at 7000C
It is observed that the diffracted prominent peaks at the (420), (400) and (422) plane are observed at the corresponding angle as reported in the standard

Summary

Introduction

Yttrium iron garnet (Y3Fe5O12) and bismuth iron garnet (Bi3Fe5O12) that belongs to a group of magnetic oxides, is an attractive material for magneto-optical devices. Samples with particle size ranging from 45nm to 450nm were obtained using a sol gel technique [12]. It is obvious that the correct sintering temperature is one of the main factors affecting the formation of the garnet phase for all the samples.

Results

Conclusion