Oxidation states and microstructure of manganese impurity centers in nanosized Al₂O₃ obtained by combustion method
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Oxidation states and microstructure of manganese impurity centers in nanosized Al₂O₃ obtained by combustion method
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| Creator |
Berezovskaya, I.V.
Khomenko, O.V. Poletaev, N.I. Khlebnikova, M.E. Stoyanova, I.V. Efryushina, N.P. Dotsenko, V.P. |
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| Subject |
Characterization and properties
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| Description |
Nanosized (10-70 nm) Al₂O₃ doped with manganese ions (Mn³⁺) was obtained by combustion method. It was found that the resulting powder consists of a mixture of transition aluminas (δ*, δ, θ), among which δ*-phase is dominant. It was shown that a part of Mn ions exists in the oxidation state +2 and occupies tetrahedral positions in δ*-Al₂O₃, causing a broadband luminescence with a maximum at ~ 520 nm. Annealing in air at temperatures ≤1130 °C results in the formation of stable α-polymorph. It is shown that the δ*, θ -> α-Al₂O₃ phase transition is followed by oxidation of Mn²⁺/Mn³⁺ ions and the stabilization of some amount of manganese ions in the oxidation state +4 on octahedral Al positions.
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| Date |
2019-06-19T16:45:58Z
2019-06-19T16:45:58Z 2018 |
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| Type |
Article
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| Identifier |
Oxidation states and microstructure of manganese impurity centers in nanosized Al₂O₃ obtained by combustion method / I.V. Berezovskaya, O.V. Khomenko, N.I. Poletaev, M.E. Khlebnikova, I.V. Stoyanova, N.P. Efryushina, V.P. Dotsenko // Functional Materials. — 2018. — Т. 25, № 3. — С. 490-495. — Бібліогр.: 28 назв. — англ.
1027-5495 DOI:https://doi.org/10.15407/fm25.03.490 http://dspace.nbuv.gov.ua/handle/123456789/157177 |
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| Language |
en
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| Relation |
Functional Materials
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| Publisher |
НТК «Інститут монокристалів» НАН України
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