Improvement in the Magnetic Hysteresis Properties of Nanocrystalline Lithium Ferrites with Addition of Yttrium Manganite

Abstract

Lithium ferrites-yttrium manganite composites were prepared by adding varying amount of yttrium manganite to lithium ferrite. The composites prepared have the general formula Li_0.5Fe_2.5O₄+(x) YMnO₃where x=(0, 10, 15, 20, 25, 30)wt%. They were studied for their structural properties by using X-Ray Diffraction (XRD) Technique. The XRD patterns revealed that in addition to the reflection peaks corresponding to cubic spinel structure of the ferrite components, few peaks which are reflections from planes of hexagonal yttrium manganite have been observed confirming the formation of composites. From the XRD data various structural parameters were evaluated and it is found that lattice constant and density increased slightly with addition of yttrium manganite while the crystallite size is decreased. The initial permeability and permeability loss of the samples showed resonance in the range 20-40MHz. The magnetic hysteresis properties were obtained from M-H loop measurements and it is found that the hysteresis parameters such as remanence and coercivity of lithium ferrites were improved with yttrium manganite additions. The results and the mechanism pertaining to the results have been discussed in the paper.

Keywords:

• Lithium ferrites
• yttrium manganites
• X-ray diffraction
• initial permeability
• magnetic hysteresis

Acknowledgements

The Authors are grateful to IIT Guwahati for VSM measurement and CeNS Bengaluru for FESEM measurement.