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Research Article | Open Access

Structural, vibrational and magnetic properties of Ti substituted bulk hematite: α-Fe2-xTixO3

Dinesh VARSHNEYa( )Arvind YOGIa,b
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

Ti doped hematite α-Fe2-xTixO3 (x = 0.0, 0.0206 and 0.0344) samples are synthesized using solid-state ceramic route technique. Single phase and corundum (Al2O3) type structure is revealed from the X-ray diffraction (XRD) pattern. On substitution of Ti at Fe site, all Raman active modes are shifted to higher wave numbers. An additional feature of Eu (LO) mode at about 660 cm–1 is observed. The Eu mode frequency is decreased and pronounced systematically as a function of Ti doping, and it reaches a value of 658 cm-1 for x = 0.0344. The coercivity Hc (remanence Mr) for x = 0.0, 0.0206 and 0.0344 are determined to be 995 Oe (0.44 emu/mg), 1404 Oe (0.00019 emu/mg) and 2023 Oe (0.00016 emu/mg), respectively. The larger coercivity for Ti doped samples can be attributed to their enhanced shape and magneto-crystalline anisotropy. The observed isomer shift (δ) from room temperature Mössbauer data clearly shows the presence of ferric (Fe3+) and Ti4+ ions illustrating strong ferromagnetic ordering up to x = 0.0206 in α-Fe2-xTixO3 hematite and weak ferromagnetic ordering of α-Fe2-xTixO3 for x = 0.0344.

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Journal of Advanced Ceramics
Pages 269-277
Cite this article:
VARSHNEY D, YOGI A. Structural, vibrational and magnetic properties of Ti substituted bulk hematite: α-Fe2-xTixO3. Journal of Advanced Ceramics, 2014, 3(4): 269-277. https://doi.org/10.1007/s40145-014-0117-x

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Received: 10 May 2014
Revised: 20 June 2014
Accepted: 22 June 2014
Published: 30 November 2014
© The author(s) 2014

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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