التفاصيل البيبلوغرافية
| العنوان: |
Influence of the Change in Oxidation Number of Mn on Magnetic Properties of BaTi{1-{x}}MnxO3. |
| المؤلفون: |
Phan, T. L., Thanh, T. D., Ho, T. A., Thang, P. D., Yu, S. C. |
| المصدر: |
IEEE Transactions on Magnetics; Apr2014 Part 1, Vol. 50 Issue 4, p1-4, 4p |
| مصطلحات موضوعية: |
OXIDATION, MAGNETIC properties of metals, MANGANESE oxides, SOLID state chemistry, CHEMICAL reactions, ELECTRONIC structure, ANNEALING of metals, TEMPERATURE effect |
| مستخلص: |
We prepared BaTi1-xMnxO3 samples ( x=0 and 0.05) by standard solid-state reaction at 700 ^{\circ}{\rm C} and 900 ^{\circ}{\rm 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 x=0.05 ratio is about one for the sample annealed at 700 ^\circC . 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 Mn^2+\rightarrowMn^3+ when the annealing temperature changes from 700 ^\circC to 900 ^\circC . Their magnetic properties are accordingly changed. Meanwhile, annealing pure BaTiO3 in an Ar ambient at 700 ^\circC and 900 ^\circC 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 Mn^2+ ions mediated by oxygen vacancies rather than associated with Mn^3+ ions. [ABSTRACT FROM AUTHOR] |
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