TY  - CONF
AU  - Scherba, Ivan
AU  - Kostyk, Lyudmyla V.
AU  - Noga, Henrik
AU  - Uskoković, Dragan
AU  - Bekenov, Lev V.
AU  - Denys, Vitalij
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12092
AB  - Crystals of Ca3Ga2Ge4O14 with the Ca-gallogermanate structure have a unique combination of physical properties - luminescent, laser, resilient, piezoelectric, and acoustic. Disordered trigonal compounds Ca3Ga2Ge4O14 activated with RE ions and transition elements are known as effective
materials of quantum electronics, which combine the functions of generation and transformation of laser irradiation frequency. It stimulated the study of spectral - luminescent properties of transitional and RE metals impurity ions in these materials. However, the electronic structure, matrix luminescence of Ca3Ga2Ge4O14 crystals have not been sufficiently studied. The crystals were grown by Czochralski technique in the atmosphere of argon with adding oxygen using platinum crucible. The X-ray emission spectra of Ga (Ge) and Ce (Eu)LIII-edge in the Ca3Ga2Ge4O14garnet with dopped Ce 3 % and Eu 4% were obtained by a tube-spectrometer with X-ray coordinate detector of the original design. OKα-spectra in the Ca3Ga2Ge4O14garnet were obtained by a SARF -spectrometer. Spectra of the core levels and the valence band in the Ca3Ga2Ge4O14were measured by the “Kratos” X-ray photoelectron spectrometer. The X-ray spectral studies of the Ca3Ga2Ge4O14have shown that the top of the valence band (near the Fermi level) is formed mainly by the outer electron p–states of Ga, Ge, and O, which intensity is sufficiently low. The middle of the valence band is formed by the Ga 3d–states with the О2s–states lying below them. These states are hybridized with the 4р–states of Ga and Ge because of which they are Кβ''–satellite in Кβ2– sub-band of Ga and Ge. The bottom of the valence band is formed by the 3d–states of germanium, which contribution in chemical binding is insignificant. Alignment of the X-ray emission bands of Ga and Ge with photoelectron spectrum of valence electrons of the Ca3Ga2Ge4O14demonstrated satisfactory correspondence.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021
T1  - X-ray properties spectroscopy and electron structure of Ca3Ga2Ge4O14 garnet with dopped Ce (Eu)
SP  - 101
EP  - 101
UR  - https://hdl.handle.net/21.15107/rcub_dais_12092
ER  - 

@conference{
author = "Scherba, Ivan and Kostyk, Lyudmyla V. and Noga, Henrik and Uskoković, Dragan and Bekenov, Lev V. and Denys, Vitalij",
year = "2021",
abstract = "Crystals of Ca3Ga2Ge4O14 with the Ca-gallogermanate structure have a unique combination of physical properties - luminescent, laser, resilient, piezoelectric, and acoustic. Disordered trigonal compounds Ca3Ga2Ge4O14 activated with RE ions and transition elements are known as effective
materials of quantum electronics, which combine the functions of generation and transformation of laser irradiation frequency. It stimulated the study of spectral - luminescent properties of transitional and RE metals impurity ions in these materials. However, the electronic structure, matrix luminescence of Ca3Ga2Ge4O14 crystals have not been sufficiently studied. The crystals were grown by Czochralski technique in the atmosphere of argon with adding oxygen using platinum crucible. The X-ray emission spectra of Ga (Ge) and Ce (Eu)LIII-edge in the Ca3Ga2Ge4O14garnet with dopped Ce 3 % and Eu 4% were obtained by a tube-spectrometer with X-ray coordinate detector of the original design. OKα-spectra in the Ca3Ga2Ge4O14garnet were obtained by a SARF -spectrometer. Spectra of the core levels and the valence band in the Ca3Ga2Ge4O14were measured by the “Kratos” X-ray photoelectron spectrometer. The X-ray spectral studies of the Ca3Ga2Ge4O14have shown that the top of the valence band (near the Fermi level) is formed mainly by the outer electron p–states of Ga, Ge, and O, which intensity is sufficiently low. The middle of the valence band is formed by the Ga 3d–states with the О2s–states lying below them. These states are hybridized with the 4р–states of Ga and Ge because of which they are Кβ''–satellite in Кβ2– sub-band of Ga and Ge. The bottom of the valence band is formed by the 3d–states of germanium, which contribution in chemical binding is insignificant. Alignment of the X-ray emission bands of Ga and Ge with photoelectron spectrum of valence electrons of the Ca3Ga2Ge4O14demonstrated satisfactory correspondence.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021",
title = "X-ray properties spectroscopy and electron structure of Ca3Ga2Ge4O14 garnet with dopped Ce (Eu)",
pages = "101-101",
url = "https://hdl.handle.net/21.15107/rcub_dais_12092"
}

Scherba, I., Kostyk, L. V., Noga, H., Uskoković, D., Bekenov, L. V.,& Denys, V.. (2021). X-ray properties spectroscopy and electron structure of Ca3Ga2Ge4O14 garnet with dopped Ce (Eu). in Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021
Belgrade : Materials Research Society of Serbia., 101-101.
https://hdl.handle.net/21.15107/rcub_dais_12092

Scherba I, Kostyk LV, Noga H, Uskoković D, Bekenov LV, Denys V. X-ray properties spectroscopy and electron structure of Ca3Ga2Ge4O14 garnet with dopped Ce (Eu). in Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021. 2021;:101-101.
https://hdl.handle.net/21.15107/rcub_dais_12092 .

Scherba, Ivan, Kostyk, Lyudmyla V., Noga, Henrik, Uskoković, Dragan, Bekenov, Lev V., Denys, Vitalij, "X-ray properties spectroscopy and electron structure of Ca3Ga2Ge4O14 garnet with dopped Ce (Eu)" in Programme and the Book of abstracts / Twenty-second Annual Conference YUCOMAT 2021 Herceg Novi, Montenegro, August 30 - September 3, 2021 (2021):101-101,
https://hdl.handle.net/21.15107/rcub_dais_12092 .

TY  - JOUR
AU  - Shcherba, Ivan D.
AU  - Kostyk, L. V.
AU  - Noga, Henrik
AU  - Bekenov, L. V.
AU  - Uskoković, Dragan
AU  - Jatsyk, B. M.
PY  - 2017
UR  - https://dais.sanu.ac.rs/123456789/2381
AB  - The band structure of Ca3Ga2Ge3О12 with the garnet structure has been determined for the first time by X-ray emission and photoelectron spectroscopy. It has been established that the bottom of the valence band is formed by Ge d states, which are not dominant in the chemical bonding. Strong hybridization of oxygen 2s states with 4p states of Ga and Ge revealed by the presence of an extra structure in the X-ray emission spectra has been found. The middle of the valence band has been demonstrated to be occupied by d states of Ga, while Ga and Ge 4рstates with a considerable admixture of oxygen 2p states form the top of the valence band.
T2  - Solid State Sciences
T1  - X-ray spectra and electronic structure of the Ca3Ga2Ge3О12 compound
SP  - 1
EP  - 2
VL  - 71
DO  - 10.1016/j.solidstatesciences.2017.06.014
UR  - https://hdl.handle.net/21.15107/rcub_dais_2381
ER  - 

@article{
author = "Shcherba, Ivan D. and Kostyk, L. V. and Noga, Henrik and Bekenov, L. V. and Uskoković, Dragan and Jatsyk, B. M.",
year = "2017",
abstract = "The band structure of Ca3Ga2Ge3О12 with the garnet structure has been determined for the first time by X-ray emission and photoelectron spectroscopy. It has been established that the bottom of the valence band is formed by Ge d states, which are not dominant in the chemical bonding. Strong hybridization of oxygen 2s states with 4p states of Ga and Ge revealed by the presence of an extra structure in the X-ray emission spectra has been found. The middle of the valence band has been demonstrated to be occupied by d states of Ga, while Ga and Ge 4рstates with a considerable admixture of oxygen 2p states form the top of the valence band.",
journal = "Solid State Sciences",
title = "X-ray spectra and electronic structure of the Ca3Ga2Ge3О12 compound",
pages = "1-2",
volume = "71",
doi = "10.1016/j.solidstatesciences.2017.06.014",
url = "https://hdl.handle.net/21.15107/rcub_dais_2381"
}

Shcherba, I. D., Kostyk, L. V., Noga, H., Bekenov, L. V., Uskoković, D.,& Jatsyk, B. M.. (2017). X-ray spectra and electronic structure of the Ca3Ga2Ge3О12 compound. in Solid State Sciences, 71, 1-2.
https://doi.org/10.1016/j.solidstatesciences.2017.06.014
https://hdl.handle.net/21.15107/rcub_dais_2381

Shcherba ID, Kostyk LV, Noga H, Bekenov LV, Uskoković D, Jatsyk BM. X-ray spectra and electronic structure of the Ca3Ga2Ge3О12 compound. in Solid State Sciences. 2017;71:1-2.
doi:10.1016/j.solidstatesciences.2017.06.014
https://hdl.handle.net/21.15107/rcub_dais_2381 .

Shcherba, Ivan D., Kostyk, L. V., Noga, Henrik, Bekenov, L. V., Uskoković, Dragan, Jatsyk, B. M., "X-ray spectra and electronic structure of the Ca3Ga2Ge3О12 compound" in Solid State Sciences, 71 (2017):1-2,
https://doi.org/10.1016/j.solidstatesciences.2017.06.014 .,
https://hdl.handle.net/21.15107/rcub_dais_2381 .

TY  - CONF
AU  - Shcherba, Ivan D.
AU  - Kostyk, L. V.
AU  - Uskoković, Dragan
AU  - Tsvetkova, O.
AU  - Stosyk, A.
AU  - Jatcyk, Bohdan M.
AU  - Kokosza, R.
PY  - 2011
UR  - https://dais.sanu.ac.rs/123456789/685
AB  - Rare-earth doped gadolinium gallium garnet (Gd3Ga5O12) has attracted much attention as important material for application in many optical devices. Recently, the nanostructure materials are considered as potentially useful for many technological applications. This paper presents the results of electron structure and spectral-luminescent properties of pure and Tb3+ doped Gd3Ga5O12 nanopowders prepared by a co-precipitation method. Analysis of diffractograms of the nanopowders showed that the minimum calcinations temperature that allowed getting a single garnet phase is T ~ 750oC. An average crystalline size of powders is about 35-47 nm. The surface microstructure was observed by using an atomic force microscope Solver P47H-PRO. The luminescence transition 5D4→7Fj (green emission) is dominated at the X-ray and photo excitation of nanosized Gd3Ga5O12 doped with Tb3+. The influence of the crystalline size and preparing condition on the luminescence properties of Gd3Ga5O12 is discussed. High-energy spectroscopy has been used to study the electron structure of the investigated rare-earth doped gadolinium gallium garnet (Gd3Ga5O12). The calculations of electron energy bands E(k) and partial DOS for compounds were performed by the semi relativistic linear muffin-tin orbital method without considerations of spin-orbit interactions. Effective filling numbers of electrons in different bands of components in garnet Gd3Ga5O12 been calculated. Between the experimental and calculated X-ray emission spectra garnet Gd3Ga5O12 good agreement has been obtained.
PB  - Belgrade : Materials Research Society of Serbia
C3  - The Thirteenth Annual Conference YUCOMAT 2011: Programme and the Book of Abstracts
T1  - Electron structure and optical propertics of Gd3Ga5O12 GARNET doped with Tb
SP  - 108
EP  - 108
UR  - https://hdl.handle.net/21.15107/rcub_dais_685
ER  - 

@conference{
author = "Shcherba, Ivan D. and Kostyk, L. V. and Uskoković, Dragan and Tsvetkova, O. and Stosyk, A. and Jatcyk, Bohdan M. and Kokosza, R.",
year = "2011",
abstract = "Rare-earth doped gadolinium gallium garnet (Gd3Ga5O12) has attracted much attention as important material for application in many optical devices. Recently, the nanostructure materials are considered as potentially useful for many technological applications. This paper presents the results of electron structure and spectral-luminescent properties of pure and Tb3+ doped Gd3Ga5O12 nanopowders prepared by a co-precipitation method. Analysis of diffractograms of the nanopowders showed that the minimum calcinations temperature that allowed getting a single garnet phase is T ~ 750oC. An average crystalline size of powders is about 35-47 nm. The surface microstructure was observed by using an atomic force microscope Solver P47H-PRO. The luminescence transition 5D4→7Fj (green emission) is dominated at the X-ray and photo excitation of nanosized Gd3Ga5O12 doped with Tb3+. The influence of the crystalline size and preparing condition on the luminescence properties of Gd3Ga5O12 is discussed. High-energy spectroscopy has been used to study the electron structure of the investigated rare-earth doped gadolinium gallium garnet (Gd3Ga5O12). The calculations of electron energy bands E(k) and partial DOS for compounds were performed by the semi relativistic linear muffin-tin orbital method without considerations of spin-orbit interactions. Effective filling numbers of electrons in different bands of components in garnet Gd3Ga5O12 been calculated. Between the experimental and calculated X-ray emission spectra garnet Gd3Ga5O12 good agreement has been obtained.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "The Thirteenth Annual Conference YUCOMAT 2011: Programme and the Book of Abstracts",
title = "Electron structure and optical propertics of Gd3Ga5O12 GARNET doped with Tb",
pages = "108-108",
url = "https://hdl.handle.net/21.15107/rcub_dais_685"
}

Shcherba, I. D., Kostyk, L. V., Uskoković, D., Tsvetkova, O., Stosyk, A., Jatcyk, B. M.,& Kokosza, R.. (2011). Electron structure and optical propertics of Gd3Ga5O12 GARNET doped with Tb. in The Thirteenth Annual Conference YUCOMAT 2011: Programme and the Book of Abstracts
Belgrade : Materials Research Society of Serbia., 108-108.
https://hdl.handle.net/21.15107/rcub_dais_685

Shcherba ID, Kostyk LV, Uskoković D, Tsvetkova O, Stosyk A, Jatcyk BM, Kokosza R. Electron structure and optical propertics of Gd3Ga5O12 GARNET doped with Tb. in The Thirteenth Annual Conference YUCOMAT 2011: Programme and the Book of Abstracts. 2011;:108-108.
https://hdl.handle.net/21.15107/rcub_dais_685 .

Shcherba, Ivan D., Kostyk, L. V., Uskoković, Dragan, Tsvetkova, O., Stosyk, A., Jatcyk, Bohdan M., Kokosza, R., "Electron structure and optical propertics of Gd3Ga5O12 GARNET doped with Tb" in The Thirteenth Annual Conference YUCOMAT 2011: Programme and the Book of Abstracts (2011):108-108,
https://hdl.handle.net/21.15107/rcub_dais_685 .