X-ray Photoelectron Spectra and Electronic Structure of New Functional Materials 2018

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (31 July 2019) | Viewed by 6114

Special Issue Editor


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Guest Editor
Institute of Physics and Technology, Ural Federal University, 620002 Yekaterinburg, Russia
Interests: films; oxidation state; transition metal; doping, surface; defects; X-ray spectroscopy; DFT
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Special Issue Information

Dear Colleagues,

For the creation of new promising functional materials with special electrical, optical, and magnetic properties, information about the atomic and electronic structure of these materials is required. In connection with the development of new experimental and computational methods in condensed matter physics as well as computer technology, new possibilities arise for determining the energy structure of various compounds, including those that are quite complex in composition and crystal structure. Thus, numerical modelling of the electronic structure is becoming increasingly important for revealing the mechanisms of the appearance of special physical properties and their changes under the influence of temperature, pressure, and electric and magnetic fields. However, the achievement of such calculations is primarily due to the introduction of significant simplifications into the original Schrödinger equation written for the molecule in question, which allows one to obtain an approximate solution to a greater or lesser extent.

Thereby, the question arises as to whether the researcher has experimental methods that allow direct comparison of the obtained data with the results of theoretical calculations. What requirements must these methods satisfy in the first place? First of all, they must be directly related to the quantities obtained as a result of theoretical calculations. Such quantities are the possible energy levels of the system and the corresponding wave functions. Knowing them, we can calculate other parameters of the electronic system that are of interest to us.

Investigation of substances of complex composition by X-ray spectroscopy provides the greatest efficiency, since it allows information about the energy of chemical bonds and the structure of the valence band to be obtained directly.

Thus, the scope of this Special Issue “X-ray Spectra and Electronic Structure of New Functional Materials” encompasses original works on experimental and theoretical investigations of electronic structure.

Prof. Ivan S. Zhidkov
Guest Editor

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Keywords

  • Electronic structure
  • X-ray photoelectron spectroscopy
  • X-ray absorption spectroscopy
  • RISX
  • Density functional theory (DFT) calculations
  • Surface characterization
  • Electronic properties
  • Computer simulations
  • X-ray spectroscopy

Published Papers (2 papers)

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Research

6 pages, 1238 KiB  
Article
Electronic Structure of Intermetallic Antiferromagnet GdNiGe
by Evgenii D. Baglasov and Alexey V. Lukoyanov
Symmetry 2019, 11(6), 737; https://doi.org/10.3390/sym11060737 - 30 May 2019
Cited by 8 | Viewed by 2252
Abstract
The electronic structure of the GdNiGe ternary intermetallic compound was investigated in this work. We carried out the spin-polarized DFT+U calculations of its band structure within generalized gradient approximation accounting for strong electronic correlations in the 4f-shell of gadolinium ions. The antiferromagnetic ordering [...] Read more.
The electronic structure of the GdNiGe ternary intermetallic compound was investigated in this work. We carried out the spin-polarized DFT+U calculations of its band structure within generalized gradient approximation accounting for strong electronic correlations in the 4f-shell of gadolinium ions. The antiferromagnetic ordering was reproduced in the calculations, in agreement with experimental data. The calculated equilibrium volume is within 2% accuracy to the experimental crystal structure data, which demonstrates the reliability of the method chosen. The 4f-shell of Gd was demonstrated to substantially contribute to the spectral and magnetic properties of the GdNiGe compounds, whereas other ions were found nonmagnetic, in agreement with experimental data. Full article
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8 pages, 1268 KiB  
Communication
Optical Transparency and Local Electronic Structure of Yb-Doped Y2O3 Ceramics with Tetravalent Additives
by Ivan S. Zhidkov, Andrey I. Kukharenko, Roman N. Maksimov, Larisa D. Finkelstein, Seif O. Cholakh, Vladimir V. Osipov and Ernst Z. Kurmaev
Symmetry 2019, 11(2), 243; https://doi.org/10.3390/sym11020243 - 16 Feb 2019
Cited by 9 | Viewed by 3529
Abstract
The results of optical transmission and X-ray core-level spectra measurements of Yb:Y2O3 ceramics with different tetravalent sintering additives (ZrO2, CeO2 and HfO2) fabricated from nanopowders (produced by the laser ablation method) and then annealed at [...] Read more.
The results of optical transmission and X-ray core-level spectra measurements of Yb:Y2O3 ceramics with different tetravalent sintering additives (ZrO2, CeO2 and HfO2) fabricated from nanopowders (produced by the laser ablation method) and then annealed at 1400 ℃ in air for 2 h are presented. It is found that the transmission values for ZrO2- and HfO2-doped ceramics at the lasing wavelengths are higher than those of CeO2-doped samples. The X-ray photoelectron spectra (XPS) O 1s spectra show that the relative intensity of oxygen defect peak detected for 3Yb:Y2O3 + 5CeO2 ceramics decreases substantially and consistently compared to that of 5Yb:Y2O3 + 5HfO2 and 3Yb:Y2O3 + 5ZrO2 samples. This can be attributed to a more complete filling of oxygen vacancies due to annealing-induced oxygen diffusion into the highly defective sintered ceramics. The measurements of XPS Ce 3d spectra showed that the insufficiently complete filling of the oxygen vacancies in the 3Yb:Y2O3 + 5CeO2 compound is due to the appreciable presence of trivalent cerium ions. Full article
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