The kinetics and mechanism of doped corundum structure formation in an water fluid

Ivakin, Yu. D.; Danchevskaya, M. N.; Ovchinnikova, Olga G.; Murav’eva, G. P.; Крейсберг, В. А.

doi:10.1134/s199079310907001x

Cited by 11 publications

(9 citation statements)

References 31 publications

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“…A minute concentration of tetravalent Mn 4+ ions, in the as prepared powder, manifests itself by 2 E → 4 A 2 ( R -lines at ∼674 nm and ∼678 nm, separated by ∼80 cm −1 ) photoluminescence (PL), 31–36 as shown in the inset of Fig. 4(a).…”

Section: Resultsmentioning

confidence: 92%

Reversible Mn valence state switching in submicron α-Al₂O₃:Mn by soft X-rays and blue light – a potential pathway towards multilevel optical data storage

Wahib

Riesen

2022

Phys. Chem. Chem. Phys.

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Section: Resultsmentioning

confidence: 92%

Reversible Mn valence state switching in submicron α-Al₂O₃:Mn by soft X-rays and blue light – a potential pathway towards multilevel optical data storage

Wahib

Riesen

2022

Phys. Chem. Chem. Phys.

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“…In addition, we note that the lowest energy peak at 3.96 eV observed in the α-Al 2 O 3 spectrum may be associated with absorption of Mn-ion impurity centers [36], which are typical for alumina materials.…”

Section: Resultsmentioning

confidence: 99%

Photochemistry of the α-Al2O3-PETN Interface

et al. 2016

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Abstract:Optical absorption measurements are combined with electronic structure calculations to explore photochemistry of an α-Al 2 O 3 -PETN interface formed by a nitroester (pentaerythritol tetranitrate, PETN, C 5 H 8 N 4 O 12 ) and a wide band gap aluminum oxide (α-Al 2 O 3 ) substrate. The first principles modeling is used to deconstruct and interpret the α-Al 2 O 3 -PETN absorption spectrum that has distinct peaks attributed to surface F 0 -centers and surface-PETN transitions. We predict the low energy α-Al 2 O 3 F 0 -center-PETN transition, producing the excited triplet state, and α-Al 2 O 3 F 0 -center-PETN charge transfer, generating the PETN anion radical. This implies that irradiation by commonly used lasers can easily initiate photodecomposition of both excited and charged PETN at the interface. The feasible mechanism of the photodecomposition is proposed.

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“…It is attributed to the 2 E ! 4 A 2 radiative transition of Mn 4+ in synthetic α-Al 2 O 3 [18,[32][33][34][35]. However, in natural α-Al 2 O 3 , it has been assigned to Mn 4+ only once [36].…”

Section: Resultsmentioning

confidence: 99%

“…First, in Al 2 O 3 , Mn 2+ , Mn 3+ , and Mn 4+ are associated with sharps bands (maximum bandwidth of 20-30 nm) between 650 and 700 nm [32,33,49,50]. Second, the luminescence lifetime of Mn (for each valence) should drastically increase at a low temperature as in other oxides (see Figure 4b, for Mn 4+ [51], for Mn 3+ [52], for Mn 2+ [53]), which is not the case here.…”

Section: Discussionmentioning

confidence: 99%

Orange luminescence of α‐Al₂O₃ related to clusters consisting of F centers and divalent cations

Vigier,

Massuyeau,

Fritsch

2024

Luminescence

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The orange luminescence of α‐Al2O3 under UV excitation is characterized by a 2.07‐eV orange broadband emission that has not yet been elucidated. This emission is present in natural and synthetic crystals and powders, as well as in Be‐treated samples. All orange‐luminescent materials have low Fe concentration (mostly <1000 ppm) with traces of divalent cations, mostly Mg, or Be in Be‐diffused material (dozens of ppm). Mg2+, Mn2+, and Be2+ cations substitute for trivalent Al. To accommodate the charge deficit, several defects are created, including oxygen vacancies also called F centers. Indeed, our excitation spectra revealed the presence of several different F centers (F, F+, and clustered F2, F2+, F22+) in those samples. However, the thermal stability and the measured luminescence lifetimes do not match with previously reported characteristics of isolated F centers. Based on our experiments, we suggest that a complex aggregate of two F centers (F22+) trapped at divalent cations is a major cause of this uncommon microsecond lifetime emission, even if a variety of other defects, including Cr3+, V3+, or interstitial Al3+, are present.

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The kinetics and mechanism of doped corundum structure formation in an water fluid

Cited by 11 publications

References 31 publications

Reversible Mn valence state switching in submicron α-Al₂O₃:Mn by soft X-rays and blue light – a potential pathway towards multilevel optical data storage

Reversible Mn valence state switching in submicron α-Al₂O₃:Mn by soft X-rays and blue light – a potential pathway towards multilevel optical data storage

Photochemistry of the α-Al2O3-PETN Interface

Orange luminescence of α‐Al₂O₃ related to clusters consisting of F centers and divalent cations

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The kinetics and mechanism of doped corundum structure formation in an water fluid

Cited by 11 publications

References 31 publications

Reversible Mn valence state switching in submicron α-Al2O3:Mn by soft X-rays and blue light – a potential pathway towards multilevel optical data storage

Reversible Mn valence state switching in submicron α-Al2O3:Mn by soft X-rays and blue light – a potential pathway towards multilevel optical data storage

Photochemistry of the α-Al2O3-PETN Interface

Orange luminescence of α‐Al2O3 related to clusters consisting of F centers and divalent cations

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Reversible Mn valence state switching in submicron α-Al₂O₃:Mn by soft X-rays and blue light – a potential pathway towards multilevel optical data storage

Reversible Mn valence state switching in submicron α-Al₂O₃:Mn by soft X-rays and blue light – a potential pathway towards multilevel optical data storage

Orange luminescence of α‐Al₂O₃ related to clusters consisting of F centers and divalent cations