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Research Article | Open Access

Magnetic and structural properties of pure and Cr-doped haematite: α-Fe2-xCrxO3 (0 ≤ x ≤ 1)

Arvind YOGIa,bDinesh VARSHNEYa,*( )
Materials Science Laboratory, School of Physics, Vigyan Bhawan, Devi Ahilya University, Khandwa Road Campus, Indore 452001, India
School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram 695016, India
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Abstract

Solid-state ceramic technique route is used for synthesizing Cr-doped haematite α-Fe2-xCrxO3 (x = 0, 0.125, 0.50 and 1) samples. Single phase and corundum (Al2O3) type structure is revealed from the X-ray diffraction (XRD) patterns. The Raman spectra of α-Fe2-xCrxO3 illustrate seven phonon modes. On substitution of Cr (x = 0, 0.125, 0.50 and 1) at Fe site, all Raman active modes are shifted to higher wave numbers. The coercivity and remanence of Cr-doped haematites increase as x increases. The increased coercivity and remanence for Cr-doped samples can be attributed to their enhanced shape and magneto-crystalline anisotropy. The observed isomer shift δ values from room-temperature Mössbauer data clearly show the presence of ferric (Fe3+) and Cr3+ ions illustrating strong ferromagnetic ordering up to x = 0.125 in α-Fe2-xCrxO3 haematite and weak ferromagnetic ordering for α-Fe2-xCrxO3 (x > 0.125) haematites.

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Journal of Advanced Ceramics
Pages 360-369
Cite this article:
YOGI A, VARSHNEY D. Magnetic and structural properties of pure and Cr-doped haematite: α-Fe2-xCrxO3 (0 ≤ x ≤ 1). Journal of Advanced Ceramics, 2013, 2(4): 360-369. https://doi.org/10.1007/s40145-013-0084-7

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Received: 24 July 2013
Revised: 23 September 2013
Accepted: 13 October 2013
Published: 04 December 2013
© The author(s) 2013

Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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