2020
DOI: 10.1103/physrevb.101.024106
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Oxygen-vacancy donor-electron center in Y3Al5O12 garnet crystals: Electron paramagnetic resonance and dielectric spectroscopy study

Abstract: F + center, an electron trapped at oxygen vacancy (VO), was investigated in the oxygen deficient Y3Al5O12 (YAG) garnet crystals by electron paramagnetic resonance (EPR). The measurements were performed in the wide temperature interval 5450 K and the frequency region 9.4350 GHz with using both the conventional continue wave and pulse EPR technique. The pulse electron-nuclear double resonance was applied to resolve the hyperfine interaction of the trapped electron with surrounding nuclei. The measurements show… Show more

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Cited by 38 publications
(22 citation statements)
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References 60 publications
(95 reference statements)
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“…This mechanism may be similar to that proposed by Blahuta et al [ 13 ] and Nikl and coworkers [ 14–19 ] for Ce‐doped complex oxides codoped with divalent cations (Ca 2+ , Mg 2+ ). Following these works, Ce 3+ is partially converted into the tetravalent state to compensate the excessive negative charge induced by the substitution of trivalent host ions with a divalent dopant.…”
Section: Discussionsupporting
confidence: 86%
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“…This mechanism may be similar to that proposed by Blahuta et al [ 13 ] and Nikl and coworkers [ 14–19 ] for Ce‐doped complex oxides codoped with divalent cations (Ca 2+ , Mg 2+ ). Following these works, Ce 3+ is partially converted into the tetravalent state to compensate the excessive negative charge induced by the substitution of trivalent host ions with a divalent dopant.…”
Section: Discussionsupporting
confidence: 86%
“…This creates conditions for transport of electrons and holes to such complex defects, illustrated by the example of Ce Y ─C Al-6 (Figure 5). This mechanism may be similar to that proposed by Blahuta et al [13] and Nikl and coworkers [14][15][16][17][18][19] for Ce-doped complex oxides codoped with divalent cations (Ca 2þ , Mg 2þ ). Following these Ce 3þ is partially converted into the tetravalent state to compensate the excessive negative charge induced by the substitution of trivalent host ions with a divalent dopant.…”
Section: Discussionsupporting
confidence: 83%
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“…As exhibited in Figure 5, EPR spectrum of the fresh sample Y 3 Al 2 Ga 3 O 12 :0.01Ni 2+ show a signal centered at ∼323.3 mT, with a g factor of 1.995, originating from a singly ionized oxygen vacancy (also called F + center). 33,51,52 Under UV (254 nm) light illumination, the EPR signal at g = 1.995 is significantly enhanced due to the trapping of the pumped electrons by oxygen vacancies forming F + centers. Reversely, under visible light stimulation, the trapped electrons are released leading to the great decrease of F + centers, which is demonstrated by the decrease intensity of EPR signal to the original level.…”
Section: ■ Results and Discussionmentioning
confidence: 99%