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

Dinesh VARSHNEY; Arvind YOGI

doi:10.1007/s40145-014-0117-x

Journal of Advanced Ceramics 2014, 3(4): 269-277 https://doi.org/10.1007/s40145-014-0117-x

Research Article |

Open Access | Issue | Published: 30 November 2014

Structural, vibrational and magnetic properties of Ti substituted bulk hematite: α-Fe_2-xTi_xO₃

Show Author's Information Hide Author's Information Dinesh VARSHNEY^{^a}(

), Arvind YOGI^{^a^,^b}

^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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VARSHNEY D, YOGI A. Structural, vibrational and magnetic properties of Ti substituted bulk hematite: α-Fe_2-xTi_xO₃. Journal of Advanced Ceramics, 2014, 3(4): 269-277. https://doi.org/10.1007/s40145-014-0117-x

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Abstract

Ti doped hematite α-Fe_2-xTi_xO₃ (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 E_u (LO) mode at about 660 cm^–1 is observed. The E_u 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 H_c (remanence M_r) 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-Fe_2-xTi_xO₃ hematite and weak ferromagnetic ordering of α-Fe_2-xTi_xO₃ for x = 0.0344.

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Structural, vibrational and magnetic properties of Ti substituted bulk hematite: α-Fe_2-xTi_xO₃

Show Author's information Hide Author's Information Dinesh VARSHNEY^{^a}(

), Arvind YOGI^{^a^,^b}

^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: 10 May 2014

Revised: 20 June 2014

Accepted: 22 June 2014

Published: 30 November 2014

Issue date: December 2014

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Acknowledgements

Authors are thankful to UGC-DAE CSR, Indore for providing characterization facilities.

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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.