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Influence of the change in oxidation number of Mn on magnetic properties of BaTi1-xMnxO3

Phan, T. L and T., D. Thanh and Ho, T. A and Pham, Duc Thang and Yu, S.C. (2014) Influence of the change in oxidation number of Mn on magnetic properties of BaTi1-xMnxO3. IEEE Transactions on Magnetics, 50 (4). p. 2900104. ISSN 0018-9464

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We prepared BaTi1-xMnxO3 samples (x = 0 and 0.05) by standard solid-state reaction at 700 degrees C and 900 degrees C in an Ar ambient to change oxidation number of Mn dopants. The fabricated samples were then studied structural characterization and electronic structures by means of X-ray diffraction and absorption, and Raman scattering and electron-spin-resonance spectrometers. We found oxidation numbers 2+ and 3+ of Mn ions coexisting in BaTi1-xMnxO3 with x = 0.05, where the Mn2+/Mn3+ ratio is about one for the sample annealed at 700 degrees C. These Mn ions prefer locating at the Ti site in the tetragonal BaTiO3 host lattice. In particular, there is a change in the oxidation number of Mn2+ -> Mn3+ when the annealing temperature changes from 700 degrees C to 900 degrees C. Their magnetic properties are accordingly changed. Meanwhile, annealing pure BaTiO3 in an Ar ambient at 700 degrees C and 900 degrees C does not lead to ferromagnetic (FM) order; they are almost diamagnetic. With the obtained results, we believe that FM order in Mn-doped BaTiO3 annealed in an Ar ambient is associated with exchange interactions of Mn2+ ions mediated by oxygen vacancies rather than associated with Mn3+ ions. Influence of the Change in Oxidation Number of Mn on Magnetic Properties of BaTi1−xMnxO3.

Item Type: Article
Subjects: Engineering Physics
Divisions: Faculty of Engineering Physics and Nanotechnology (FEPN)
Depositing User: Ms. Cam Le Tran Thi
Date Deposited: 08 Nov 2015 08:53
Last Modified: 08 Nov 2015 08:54

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