Biography:

In the past M. Buryi has collaborated on articles with D.A. Spassky. One of their most recent publications is Full Length ArticleStudy of the defects in La3Ta0.5Ga5.5O14 single crystals. Which was published in journal Journal of Luminescence.

More information about M. Buryi research including statistics on their citations can be found on their Copernicus Academic profile page.

M. Buryi's Articles: (4)

Full Length ArticleStudy of the defects in La3Ta0.5Ga5.5O14 single crystals

AbstractDefects that are formed during crystal growth pose a serious obstacle for potential application of La3Ga5.5Ta0.5O14 (LGT) as a laser or piezoelectric crystal. We have performed the study of the defects origin in LGT crystals grown in different atmospheres using optical, EPR and time-resolved luminescence characterization methods. The absorption bands detected in the transparency region at 290, 360 and 490 nm (T=300 K) demonstrate different dependence on crystal annealing in vacuum and air. EPR analysis demonstrated that the defects responsible for these bands are non-paramagnetic. X-ray irradiation results in hole trapping by oxygen ions thus forming O− centers perturbed by neighboring defects. New arguments in favor of the existence of TaGa(2) antisite defects in LGT are presented. The absorption bands at 255 and 290 nm are related to oxygen vacancies localized at the different sites of crystal lattice. The absorption band at 360 nm is related to cation vacancies (VGa3−orVLa3−). Time-resolved luminescence spectroscopy allowed to identify excitation processes responsible for the defect-related emission bands.

Luminescent, optical and electronic properties of Na2Mo2O7 single crystals

AbstractLuminescent, optical and electronic properties of Na2Mo2O7 single crystals grown by two different procedures, the conventional Czochralski method and the low-temperature gradient Czochralski technique, are presented. The band structure calculations were performed in generalized gradient and local density approximations and allowed to determine the composition and structure of the valence and conduction bands. It is shown that the bottom of the conduction band is formed by the 4d states of Mo in octahedral oxygen coordination while the contribution of 4d states of Mo in tetrahedral oxygen coordination starts at 0.7 eV above the bottom of the conduction band. The optical bandgap of the crystals was estimated from absorption spectra to Egopt = 3.2 eV. The absorption band observed below the fundamental absorption edge at 370 nm is connected with the presence of oxygen vacancies. The luminescence spectrum is represented by a single emission band at 1.82 eV (T = 10 K), which is ascribed to the excitons self-trapped at oxyanionic complexes. The origin of charge carrier traps was studied using the combination of the methods of electron paramagnetic resonance and thermostimulated luminescence. Several electron and hole trapping centers were revealed including self-trapped holes and F+ centers. The influence of trapping centers on the excitation energy transfer to the emission centers is discussed.

Trap centers in molybdates

Highlights•Activation energies and frequency factors of traps were determined in molybdates.•Influence of charge carriers trapping on luminescence properties is shown.•Self-trapped electrons and holes co-exist in ZnMoO4.•Low scintillation yield at 10 K in ZnMoO4 is due to self-trapping phenomena.

Electron Spin Resonance study of charge trapping in α-ZnMoO4 single crystal scintillator

Highlights•The charge traps created by X-ray irradiation in the α-ZnMoO4 were studied by ESR.•An electron trap was an electron self-trapped at the (Mo(1)O4)3− complex.•We show delocalization of the self-trapped electron over the complex.•A hole trap was a hole trapped and stabilized at the O(3) regular oxygen site.•We report a complete set of the corresponding spin Hamiltonian parameters.

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