NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.45 [2007] >
IJPAP Vol.45(03) [March 2007]  >


Title: Structural and magnetic properties of zinc ferrite aluminates
Authors: Lal, Roshan
Suman
Sharma, N D
Taneja, S P
Reddy, V R
Keywords: Structural properties
Magnetic properties
Zinc ferrite aluminates
X-ray diffraction
Mössbauer absorption spectra
Issue Date: Mar-2007
Publisher: CSIR
IPC CodeG01J3/28
Abstract: Zinc ferrite aluminates ZnAlxFe₂₋xO₄ with composition (0≤ x ≤1) were synthesized at 1150C using the usual ceramic method and studied by X-ray diffraction, magnetization and Mössbauer measurements. It is observed that lattice parameter decreases, with increasing Al concentration (x). Mössbauer absorption spectra of all the samples recorded at room temperature showed three hyperfine magnetic sextets and a single quadrupole doublet. The outer sextet is assigned to ⍺- Fe₂O₃ crystalline phase, whereas inner two sextets refer to Fe³⁺ ions at octahedral (B) site and tetrahedral (A) site showing the formation of zinc ferrite aluminates phase. The hyperfine magnetic field was found to decrease with increasing Al concentration and has been explained on the basis of super transferred hyperfine field. The central doublet is partially dissociated forming ZnFeO₂ (delafossite) phase overlapping the main Mössbauer spectra measured at room temperature. The observed variations in saturation magnetization in all the samples have been explained on the basis of site distribution and the strength of the exchange interactions between the magnetic ions. On the basis of these observations, it is concluded that the present ferrite system exhibits a non-collinear magnetic structure with a very weak ferromagnetic character, which starts dominating further when zinc ferrite is diluted with non-magnetic Al³⁺ ions.
Page(s): 231-237
ISSN: 0019-5596
Source:IJPAP Vol.45(03) [March 2007]

Files in This Item:

File Description SizeFormat
IJPAP 45(3) 231-237.pdf208.65 kBAdobe PDFView/Open
 Current Page Visits: 512 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 556425 since 06-Feb-2009  Last updated on 15-Jul-2014Webmaster: nopr@niscair.res.in