High Saturation Induction for Bi-Substituted Yttrium Iron Garnet Prepared Via Sol Gel Technique

Noorhana Yahya,Goh Kah Hean

doi:10.3844/ajassp.2007.80.84

Abstract

Y3.0-xBixFe5O12 samples (x = 0.2 and 0.4) were prepared via novel sol-gel and conventional solid-state techniques. The effect of bismuth in both techniques was investigated in terms of shrinkage, density, hysteresis and initial permeability. Sharp and clear diffraction XRD lines with highest peak appear at about 32Â° of the 2I¸, for all the powders sintered at 900Â°C and 1250Â°C for both techniques. In evaluating the magnetic properties, it was observed that the saturation induction (1.1902kG) of sample prepared via sol-gel technique (Y2.8Bi0.2Fe5O12) is more than 200% higher than sample with the same formula prepared via conventional technique. Fine grained microstructure with average grain size of about 5I¼ m and higher shrinkage, about 11% were observed from the samples prepared via sol gel technique. It is concluded that samples prepared via sol gel technique appear to be an attractive route due to the possible reduction of cost of production and the enhanced magnetic and structural properties of the sample.

Highlights

MATERIALS AND METHODSFerrites may be defined as magnetic materials composed of oxide containing ferric ions as the main constituent
Recent studies involved the work of Marysko[5], who studied the properties of cobalt doped Yttrium iron garnet (YIG) films and the work of Xhang et al that focused on the magneto-optical properties of Nd substituted YIG[6]
Each of the methods presented here enables the production of single phase yttrium iron garnet which have excellent magnetic properties

Summary

Introduction

MATERIALS AND METHODSFerrites may be defined as magnetic materials composed of oxide containing ferric ions as the main constituent. This work deals with preparation of BiY3Fe5O12 samples using conventional, solid-state and novel, sol-gel techniques. Samples prepared via sol-gel technique are speculated to have finer grains and would have higher density.

Results

Conclusion