AI Chat Paper
Note: Please note that the following content is generated by AMiner AI. SciOpen does not take any responsibility related to this content.
{{lang === 'zh_CN' ? '文章概述' : 'Summary'}}
{{lang === 'en_US' ? '中' : 'Eng'}}
Chat more with AI
Powered by AMiner. Clicking this button will take you away from SciOpen.
Home Journal of Advanced Ceramics Article
PDF (441.9 KB)
Cite
EndNote(RIS) BibTeX
Collect
Submit Manuscript AI Chat Paper
Show Outline
Outline
Show full outline
Hide outline
Outline
Show full outline
Hide outline
Research Article | Open Access

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

Arvind YOGIa,b, Dinesh 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
Show Author Information

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.

Keywords

Mössbauer spectroscopyX-ray diffraction (XRD)magnetic materialsRaman spectra

References

[1]
Saragovi C, Arpe J, Sileo E, et al. Changes in the structural and magnetic properties of Ni-substituted hematite prepared from metal oxinates. Phys Chem Miner 2004, 31: 625-632.
Crossref Google Scholar
[2]
Van San E, De Grave E, Vandenberghe RE, et al. Study of Al-substituted hematites, prepared from thermal treatment of lepidocrocite. Phys Chem Miner 2001, 28: 488-497.
Crossref Google Scholar
[3]
Kanai H, Mizutani H, Tanaka T, et al. X-ray absorption study on the local structures of fine particles of α-Fe2O3–SnO2 gas sensors. J Mater Chem 1992, 2: 703-707.
Crossref Google Scholar
[4]
Owoc D, Przewoznik J, Kozlowski A, et al. X-ray studies of Fe3-xMexO4, Me = Zn, Ti and Al; the impact of doping on the Verwey transition. Physica B 2005, 359–361: 1339-1341.
Crossref Google Scholar
[5]
Busca G, Ramis G, Prieto MC, et al. Preparation and characterization of Fe2-xCrxO3 mixed oxide powders. J Mater Chem 1993, 3: 665-673.
Crossref Google Scholar
[6]
Musić S, Lenglet M, Popović S, et al. Formation and characterization of the solid solutions (CrxFe1-x)2O3, 0 ≤ x ≤ 1. J Mater Sci 1996, 31: 4067-4076.
Crossref Google Scholar
[7]
Zysler RD, Fiorani D, Testa AM, et al. Size dependence of the spin-flop transition in hematite nanoparticles. Phys Rev B 2003, 68: 212408.
Crossref Google Scholar
[8]
López JL, Pfannes H-D, Paniago R, et al. Investigation of the static and dynamic magnetic properties of CoFe2O4 nanoparticles. J Magn Magn Mater 2008, 320: e327-e330.
Crossref Google Scholar
[9]
Dang M-Z, Rancourt DG, Dutrizac JE, et al. Interplay of surface conditions, particle size, stoichiometry, cell parameters, and magnetism in synthetic hematite-like materials. Hyperfine Interact 1998, 117: 271-319.
Crossref Google Scholar
[10]
Bruzzone CL, Ingalls R. Mössbauer-effect study of the Morin transition and atomic positions in hematite under pressure. Phys Rev B 1983, 28: 2430-2440.
Crossref Google Scholar
[11]
Hofmann M, Campbell SJ, Kaczmarek WA, et al. Mechanochemical transformation of α-Fe2O3 to Fe3-xO4—Microstructural investigation. J Alloys Compd 2003, 348: 278-284.
Crossref Google Scholar
[12]
Bersani D, Lottici PP, Montenero A. Micro-Raman investigation of iron oxide films and powders produced by sol–gel syntheses. J Raman Spectrosc 1999, 30: 355-360.
Crossref
[13]
Shim S-H, Duffy TS. Raman spectroscopy of Fe2O3 to 62 GPa. Am Mineral 2001, 87: 318-326.
Crossref Google Scholar
[14]
Beattie IR, Gilson TR. The single-crystal Raman spectra of nearly opaque materials. Iron(III) oxide and chromium(III) oxide. J Chem Soc A 1970: 980-986.
Crossref Google Scholar
[15]
McCarty KF. Inelastic light scattering in α-Fe2O3: Phonon vs magnon scattering. Solid State Commun 1988, 68: 799-802.
Crossref Google Scholar
[16]
McCarty KF, Boehme DR. A Raman study of the systems Fe3-xCrxO4 and Fe2-xCrxO3. J Solid State Chem 1989, 79: 19-27.
Crossref Google Scholar
[17]
Zhao Y, Dunnill CW, Zhu Y, et al. Low-temperature magnetic properties of hematite nanorods. Chem Mater 2007, 19: 916-921.
Crossref Google Scholar
[18]
Bødker F, Hansen MF, Koch CB, et al. Magnetic properties of hematite nanoparticles. Phys Rev B 2000, 61: 6826-6838.
Crossref Google Scholar
[19]
Rath C, Sahu KK, Kulkarmi SD, et al. Microstructure-dependent coercivity in mono-dispersed hematite particles. Appl Phys Lett 1999, 75: 4171.
Crossref Google Scholar
[20]
Gregg KA, Perera SC, Lawes G, et al. Controlled synthesis of MnP nanorods: Effect of shape anisotropy on magnetization. Chem Mater 2006, 18: 879-886.
Crossref Google Scholar
[21]
Hill AH, Jiao F, Bruce PG, et al. Neutron diffraction study of mesoporous and bulk hematite, α-Fe2O3. Chem Mater 2008, 20: 4891-4899.
Crossref Google Scholar
[22]
Ayub I, Berry FJ, Bilsborrow RL, et al. Influence of zinc doping on the structural and magnetic properties of α-Fe2O3. J Solid State Chem 2001, 156: 408-414.
Crossref Google Scholar
[23]
He T, Luo H-L, Li S. Effect of cobalt on the morin transition of hematite. J Magn Magn Mater 1988, 71: 323-328.
Crossref Google Scholar
[24]
Barrero CA, Arpe J, Sileo E, et al. Ni- and Zn-doped hematite obtained by combustion of mixed metal oxinates. Physica B 2004, 354: 27-34.
Crossref Google Scholar
[25]
Morrish AH. Canted Antiferromagnetism: Hematite. Singapore: World Scientific Publishing Company, 1994.
Crossref
[26]
Stewart SJ, Borzi RA, Cabanillas ED, et al. Effects of milling-induced disorder on the lattice parameters and magnetic properties of hematite. J Magn Magn Mater 2003, 260: 447-454.
Crossref Google Scholar
[27]
Sileo EE, Daroca DP, Barrero CA, et al. Influence of the genesis on the structural and hyperfine properties of Cr-substituted hematites. Chem Geol 2007, 238: 84-93.
Crossref Google Scholar
[28]
Ericsson T, Krisnhamurthy A, Srivastava BK. Morin-transition in Ti-substituted hematite: A Mössbauer study. Phys Scr 1986, 33: 88.
Crossref Google Scholar
[29]
Varshney D, Yogi A. Structural and transport properties of stoichiometric and Cu2+-doped magnetite: Fe3-x CuxO4. Mater Chem Phys 2010, 123: 434-438.
Crossref Google Scholar
[30]
Ruebenbauer K, Birchall T. A computer programme for the evaluation of Mössbauer data. Hyperfine Interact 1979, 7: 125-133.
Crossref Google Scholar
[31]
Li L, Chu Y, Liu Y. Synthesis and characterization of ring-like α-Fe2O3. Nanotechnology 2007, 18: 105603.
Crossref Google Scholar
[32]
Jacob J, Abdul Khadar M. VSM and Mössbauer study of nanostructured hematite. J Magn Magn Mater 2010, 322: 614-621.
Crossref Google Scholar
[33]
Varshney D, Yogi A. Structural and electrical conductivity of Mn doped hematite (α-Fe2O3) phase. J Mol Struct 2011, 995: 157-162.
Crossref Google Scholar
Journal of Advanced Ceramics
Volume 2 Issue 4,
December 2013
Pages 360-369
DOI: 10.1007/s40145-013-0084-7
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

835

Views

26

Downloads

55

Crossref

N/A

Web of Science

56

Scopus

0

CSCD

Altmetrics
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.
Return