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

Arvind YOGI; Dinesh VARSHNEY

doi:10.1007/s40145-013-0084-7

Journal of Advanced Ceramics 2013, 2(4): 360-369 https://doi.org/10.1007/s40145-013-0084-7

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Open Access | Issue | Published: 04 December 2013

Magnetic and structural properties of pure and Cr-doped haematite: α-Fe_2-xCr_xO₃ (0 ≤ x ≤ 1)

Show Author's Information Hide Author's Information Arvind YOGI^{^a^,^b}, Dinesh VARSHNEY^{^a^,^*}(

)

^a Materials Science Laboratory, School of Physics, Vigyan Bhawan, Devi Ahilya University, Khandwa Road Campus, Indore 452001, India

^b School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram 695016, India

Keywords:

Mössbauer spectroscopy, X-ray diffraction (XRD), magnetic materials, Raman spectra

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YOGI A, VARSHNEY D. Magnetic and structural properties of pure and Cr-doped haematite: α-Fe_2-xCr_xO₃ (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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Abstract

Solid-state ceramic technique route is used for synthesizing Cr-doped haematite α-Fe_2-xCr_xO₃ (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-Fe_2-xCr_xO₃ 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-Fe_2-xCr_xO₃ haematite and weak ferromagnetic ordering for α-Fe_2-xCr_xO₃ (x > 0.125) haematites.

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Magnetic and structural properties of pure and Cr-doped haematite: α-Fe_2-xCr_xO₃ (0 ≤ x ≤ 1)

Show Author's information Hide Author's Information Arvind YOGI^{^a^,^b}, Dinesh VARSHNEY^{^a^,^*}(

)

^a Materials Science Laboratory, School of Physics, Vigyan Bhawan, Devi Ahilya University, Khandwa Road Campus, Indore 452001, India

^b School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram 695016, India

Abstract

Keywords: Mössbauer spectroscopy, X-ray diffraction (XRD), magnetic materials, Raman spectra

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Acknowledgements

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Publication history

Received: 24 July 2013

Revised: 23 September 2013

Accepted: 13 October 2013

Published: 04 December 2013

Issue date: December 2013

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Acknowledgements

Authors are thankful to UGC New Delhi for financial assistance and to UGC-DAE CSR, Indore for providing characterization facilities. Useful discussions with Dr. D. M. Phase, Dr. R. J. Choudhary, Dr. V. Sathe and Dr. V. R. Reddy are gratefully acknowledged.

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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.