Hyperfine interaction of defects in insulators

Henderson, B.; Garrison, A. K.

doi:10.1080/00018737300101319

Cited by 28 publications

(6 citation statements)

References 132 publications

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“…A single electron in an oxygen vacancy (F center) is paramagnetic and is expected to yield a single resonance centered near the free electron g-value (2.0023) [9]. This is consistent with our results where the F center g-values for bulk and nanophosphor LSO and YSO vary between 2.004 and 2.006.…”

Section: A Eprsupporting

confidence: 89%

“…Owing to lifetime broadening the Ce resonances are only observed for temperatures less than 50 K. The lower curve of Fig. 3 shows the EPR spectrum of bulk LSO taken at 6 K. The two sharp resonances are due to Ce and are in agreement with data of [9]. They are assigned to the larger (seven-oxygen coordinated) substitutional site, denoted Ce [6].…”

Section: A Eprsupporting

confidence: 73%

“…4 shows the corresponding EPR spectrum of nanophosphor LSO with the simulated spectrum shown by the upper curve. The main difference between bulk and nanophosphor Ce resonances is the enhanced broadening [9] of the nanophosphor line width. This is attributed to a distribution of g-values presumably associated with lattice disorder.…”

Section: A Eprmentioning

confidence: 98%

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EPR and Luminescence of ${\hbox {F}}^{+}$ Centers in Bulk and Nanophosphor Oxyorthosilicates

Cooke

Blair

Smith

et al. 2008

IEEE Trans. Nucl. Sci.

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The main thermally stimulated luminescence glow peak in irradiated oxyorthosilicates occurs near 360-400 K and has been postulated to comprise an electron trapped at an oxygen vacancy (F + center). We have used electron paramagnetic resonance spectroscopy to identify this defect in Ln 2 SiO 5 : Ce (Ln = Lu and Y) and show that it consists of a single electron trapped at a non-silicon-bonded oxygen vacancy in both bulk and nanophosphor oxyorthosilicates. Both Lu-and Y-based nanophosphors form seven-and nine-oxygen coordinated structures (P2 1 c) whereas the bulk phosphors form six-and seven-oxygen coordinated structures (C2/c). In each case the F + center predominately forms at the larger oxygen site. A typical resonance comprises a single Gaussian line broadened by hyperfine interaction with g-values near the free electron value and hyperfine coupling 0.4 mT. The F + center can be annealed and radiation-induced, consistent with the thermally stimulated luminescence glow peak behavior.

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Section: A Eprsupporting

confidence: 89%

Section: A Eprsupporting

confidence: 73%

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EPR and Luminescence of ${\hbox {F}}^{+}$ Centers in Bulk and Nanophosphor Oxyorthosilicates

Cooke

Blair

Smith

et al. 2008

IEEE Trans. Nucl. Sci.

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“…Машинный расчет таких процессов для NaCl и КС1 выполнен в работе 32 . Экспериментально удар-ные механизмы дефектообразования изучены на монокристаллах MgO 22 -33 - 34 . Для окиси магния пороговая энергия смещения электронами ионов кислорода составляет 330 кэв, чему соответствует энергия E d = 60 эв.…”

Section: механизмы создания радиационных дефектов а) создание дефектоunclassified

Decay of electronic excitations into radiation defects in ionic crystals

Lushchik¹,

Vitol²,

Élango³

1977

Usp. Fiz. Nauk

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“…In MgO and α‐Al 2 O 3 , these electronic point defects are well studied optically and, in case of paramagnetic F + centers, by the electron paramagnetic resonance (EPR) method as well. [ 7–12 ] In contrast, the radiation‐induced oxygen interstitials in metal oxides have been very poorly studied and detected only in association with some other imperfections. [ 11,13 ] The first experimental observation of a single charged oxygen interstitial (being part of an

{normalO}_{2}^{-}

superoxide ion) without any other structural defect/impurity in its immediate vicinity has been presented only recently for a fast‐neutron‐irradiated Al 2 O 3 single crystal by means of the EPR method.…”

Section: Introductionmentioning

confidence: 99%

The Two Types of Oxygen Interstitials in Neutron‐Irradiated Corundum Single Crystals: Joint Experimental and Theoretical Study

Lushchik

Kuzovkov

Kudryavtseva

et al. 2021

Physica Status Solidi (b)

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Corundum (α‐Al2O3) is a technologically important material and, in particular, widely used in optical applications such as luminescent radiation dosimeters, cryogenic scintillators, and is being considered as a promising candidate for windows in future fusion reactors. Its optical and mechanical properties are controlled by the presence of radiation‐induced (in particular, by fast neutrons) defects. Herein, the thermal stability and recombination kinetics of primary anion Frenkel defects—the F and F + electronic centers and oxygen interstitials—in fast‐neutron‐irradiated α‐Al2O3 single crystals are analyzed. Theory is developed considering the formation of both neutral and charged oxygen Frenkel defect pairs; defect migration, interaction and recombination. Based on ab initio calculations and new theoretical kinetics analysis, for the first time, a coexistence is demonstrated, in comparable concentrations, of two interstitial types—neutral O atoms and negatively charged O− ions (with attributed optical absorption band maxima at 6.5 eV and 5.6 eV, respectively); and their diffusion parameters, necessary for the prediction of secondary defect‐induced reactions and defect/material thermal stability, are obtained.

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Hyperfine interaction of defects in insulators

Cited by 28 publications

References 132 publications

EPR and Luminescence of ${\hbox {F}}^{+}$ Centers in Bulk and Nanophosphor Oxyorthosilicates

EPR and Luminescence of ${\hbox {F}}^{+}$ Centers in Bulk and Nanophosphor Oxyorthosilicates

Decay of electronic excitations into radiation defects in ionic crystals

The Two Types of Oxygen Interstitials in Neutron‐Irradiated Corundum Single Crystals: Joint Experimental and Theoretical Study

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