Call For Paper Volume:4 Issue:8 Aug'2017 |

IMPROVEMENT IN MORPHOLOGICAL AND ELECTRO-MAGNETIC BEHAVIOUR OF HARD FERRITE PERMANENT MAGNETS BASED ON Ni-Ir SUBSTITUTION

Publication Date : 31/01/2015



Author(s) :

Ekta Chaturvedi , K. G. Rewatkar , V. M. Nanoti.


Volume/Issue :
Volume 2
,
Issue 1
(01 - 2015)



Abstract :

The Ni-Ir substituted strontium ferrite of Sr(Ni-Ir)xFe12-2xO19 (x = 0.02 & 0.08) were synthesized by sol-gel auto combustion technique and characterized using X-ray diffraction (XRD), Transmission Electron Microscopy (TEM) for morphological behaviour with electrical characteristics using Impedance Analyzer. XRD results confirmed the formation of a single phase M-type hexagonal unit cell of space group P63/mmc. The increase in Ni-Ir concentration increases the lattice parameter. TEM analysis of the sample demonstrates the formation of nano-size particles which decreases with substitution. In this paper we reported the variation of dielectric constant, dielectric loss, tangent loss, conductivity and magnetic behaviour with composition with temperature and frequency analysis of the sample. The migration of Fe3+ ion from octahedral to tetrahedral site decreases the dielectric constant with increase in Ni-Ir concentration. Activation energies were found similar with calculated at ferromagnetic and paramagnetic region. The material study we confined that the activation energy in the paramagnetic region is higher than that in the ferromagnetic region. The enhanced resistivity of Ni-Ir substituted strontium hexaferrites is a prospective application in high frequency and in microwave devices development.


No. of Downloads :

21


Indexing

Web Design MymensinghPremium WordPress ThemesWeb Development

IMPROVEMENT IN MORPHOLOGICAL AND ELECTRO-MAGNETIC BEHAVIOUR OF HARD FERRITE PERMANENT MAGNETS BASED ON Ni-Ir SUBSTITUTION

January 31, 2015