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  - CONF
AU  - Scherba, Ivan
AU  - Noga, Henrik
AU  - Antonov, Viktor
AU  - Zhak, Olga
AU  - Uskoković, Dragan
AU  - Jatcyk, Bohdan M.
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/3668
AB  - We have studied experimentally and theoretically the electronic structure and x-ray absorption spectrum at the R.E.L3 - edge and x-ray emission spectra of Ni and P in the R.E.2Ni12P5 compounds. Crystal structure of the ternary phosphate Ce2Ni12P5 has been refined using X-ray powder diffraction pattern of the single phase sample with the same nominal composition, and the isotopic structure as for earlier known La2Ni12P5-type has been proved: space group P21/m, formula units Z = 2, lattice parameters are a = 1.07809(2) nm, b = 0.36869(1) nm, c = 1.31490(3) nm, b = 107.776(4), residual R-values are RI = 0.0681, RP = 0.0442 , RwP = 0.0603. The theoretical calculations have been carried out by means of the ab initio fully-relativistic spinpolarized Dirac linear muffin-tin orbital method. The calculations show good agreement with the experimental measurements. R.E.LIII - absorption spectra in ternary R.E.2Ni12P5 compounds were obtained at 78K and 300K using a tube spectrometer equipped with an RKD-01 co-ordinate detector. The mixed valence state of Ce and Eu was obtained in the Ce2Ni12P5 and Eu2Ni12P5 compounds.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018
T1  - Crystal structure and X-Ray spectroscopic properties of R.E.2Ni12P5 compounds
SP  - 109
EP  - 109
UR  - https://hdl.handle.net/21.15107/rcub_dais_3668
ER  - 

@conference{
author = "Scherba, Ivan and Noga, Henrik and Antonov, Viktor and Zhak, Olga and Uskoković, Dragan and Jatcyk, Bohdan M.",
year = "2018",
abstract = "We have studied experimentally and theoretically the electronic structure and x-ray absorption spectrum at the R.E.L3 - edge and x-ray emission spectra of Ni and P in the R.E.2Ni12P5 compounds. Crystal structure of the ternary phosphate Ce2Ni12P5 has been refined using X-ray powder diffraction pattern of the single phase sample with the same nominal composition, and the isotopic structure as for earlier known La2Ni12P5-type has been proved: space group P21/m, formula units Z = 2, lattice parameters are a = 1.07809(2) nm, b = 0.36869(1) nm, c = 1.31490(3) nm, b = 107.776(4), residual R-values are RI = 0.0681, RP = 0.0442 , RwP = 0.0603. The theoretical calculations have been carried out by means of the ab initio fully-relativistic spinpolarized Dirac linear muffin-tin orbital method. The calculations show good agreement with the experimental measurements. R.E.LIII - absorption spectra in ternary R.E.2Ni12P5 compounds were obtained at 78K and 300K using a tube spectrometer equipped with an RKD-01 co-ordinate detector. The mixed valence state of Ce and Eu was obtained in the Ce2Ni12P5 and Eu2Ni12P5 compounds.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018",
title = "Crystal structure and X-Ray spectroscopic properties of R.E.2Ni12P5 compounds",
pages = "109-109",
url = "https://hdl.handle.net/21.15107/rcub_dais_3668"
}

Scherba, I., Noga, H., Antonov, V., Zhak, O., Uskoković, D.,& Jatcyk, B. M.. (2018). Crystal structure and X-Ray spectroscopic properties of R.E.2Ni12P5 compounds. in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018
Belgrade : Materials Research Society of Serbia., 109-109.
https://hdl.handle.net/21.15107/rcub_dais_3668

Scherba I, Noga H, Antonov V, Zhak O, Uskoković D, Jatcyk BM. Crystal structure and X-Ray spectroscopic properties of R.E.2Ni12P5 compounds. in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018. 2018;:109-109.
https://hdl.handle.net/21.15107/rcub_dais_3668 .

Scherba, Ivan, Noga, Henrik, Antonov, Viktor, Zhak, Olga, Uskoković, Dragan, Jatcyk, Bohdan M., "Crystal structure and X-Ray spectroscopic properties of R.E.2Ni12P5 compounds" in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018 (2018):109-109,
https://hdl.handle.net/21.15107/rcub_dais_3668 .

TY  - CONF
AU  - Scherba, Ivan
AU  - Uskoković, Dragan
AU  - Kovalska, Maria V.
PY  - 2015
UR  - https://dais.sanu.ac.rs/123456789/830
AB  - High-energy spectroscopy (XES, XAS and XPS) has been used to study the electron structure of the investigated new ternary intermetallic compounds. In recent years there has been a continually increasing interest in investigation of ternary compounds with crystallize in the YNi9Si2, CeGa2Al2, Yb2Fe4Si9, ThMn12 and AlB2, which have a large variety of ground state properties. LIII -absorption spectra Ce(Yb) in ternary compounds were obtained at 80K and 300K using a tube spectrometer. The mixed valence state of Ce(Yb) was obtained in the investigation compounds. The measurements were carried out both with classical methods as well with the Mossbauer effect in order to establish parameters of the hyperfine interactions (only for confirm Fe atoms compounds). The calculations of electron energy bands E(k) and partial DOS for compounds new R.E.M2X2 were performed by the semi relativistic linear muffin-tin orbital method without considerations of spin-orbit interactions A satisfactory agreement between theoretical and experimental data is achieved.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 2015, Herceg Novi, August 31– September 4, 2015
T1  - Valence State Ce(Yb), Electron Structure and Physical Properties of New Ternary Intermetallic Compounds
SP  - 66
EP  - 66
UR  - https://hdl.handle.net/21.15107/rcub_dais_830
ER  - 

@conference{
author = "Scherba, Ivan and Uskoković, Dragan and Kovalska, Maria V.",
year = "2015",
abstract = "High-energy spectroscopy (XES, XAS and XPS) has been used to study the electron structure of the investigated new ternary intermetallic compounds. In recent years there has been a continually increasing interest in investigation of ternary compounds with crystallize in the YNi9Si2, CeGa2Al2, Yb2Fe4Si9, ThMn12 and AlB2, which have a large variety of ground state properties. LIII -absorption spectra Ce(Yb) in ternary compounds were obtained at 80K and 300K using a tube spectrometer. The mixed valence state of Ce(Yb) was obtained in the investigation compounds. The measurements were carried out both with classical methods as well with the Mossbauer effect in order to establish parameters of the hyperfine interactions (only for confirm Fe atoms compounds). The calculations of electron energy bands E(k) and partial DOS for compounds new R.E.M2X2 were performed by the semi relativistic linear muffin-tin orbital method without considerations of spin-orbit interactions A satisfactory agreement between theoretical and experimental data is achieved.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 2015, Herceg Novi, August 31– September 4, 2015",
title = "Valence State Ce(Yb), Electron Structure and Physical Properties of New Ternary Intermetallic Compounds",
pages = "66-66",
url = "https://hdl.handle.net/21.15107/rcub_dais_830"
}

Scherba, I., Uskoković, D.,& Kovalska, M. V.. (2015). Valence State Ce(Yb), Electron Structure and Physical Properties of New Ternary Intermetallic Compounds. in Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 2015, Herceg Novi, August 31– September 4, 2015
Belgrade : Materials Research Society of Serbia., 66-66.
https://hdl.handle.net/21.15107/rcub_dais_830

Scherba I, Uskoković D, Kovalska MV. Valence State Ce(Yb), Electron Structure and Physical Properties of New Ternary Intermetallic Compounds. in Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 2015, Herceg Novi, August 31– September 4, 2015. 2015;:66-66.
https://hdl.handle.net/21.15107/rcub_dais_830 .

Scherba, Ivan, Uskoković, Dragan, Kovalska, Maria V., "Valence State Ce(Yb), Electron Structure and Physical Properties of New Ternary Intermetallic Compounds" in Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 2015, Herceg Novi, August 31– September 4, 2015 (2015):66-66,
https://hdl.handle.net/21.15107/rcub_dais_830 .