Browsing B6 – LU institūti un aģentūras / Institutes and agencies of the UL by Author "Pankratov, Vladimir"
Now showing items 1-20 of 24
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Ab Initio Study on the Vibrational and Electronic Properties of Radiation-Induced Defects in Potassium Bromide
Platonenko, Alexander; Pankratov, Vladimir; Kotomin, Eugene A.; Dauletbekova, Alma; Popov, Anatoli I. (MDPI, 2024)The vibrational and electronic properties of several basic radiation defects in potassium bromide are computed at the quantum mechanical level using a periodic supercell approach based on hybrid functionals, an all-electron ... -
Ab-Initio Calculations of Oxygen Vacancy in Ga2O3 Crystals
Usseinov, A.; Koishybayeva, Zh.; Platonenko, Aleksandrs; Akilbekov, A.; Purans, Juris; Pankratov, Vladimir; Suchikova, Y.; Popov, Anatoli I. (Sciendo, 2021)Gallium oxide β-Ga2O3 is an important wide-band gap semiconductor. In this study, we have calculated the formation energy and transition levels of oxygen vacancies in β-Ga2O3 crystal using the B3LYP hybrid exchange-correlation ... -
Band Gap Engineering and Trap Depths of Intrinsic Point Defects in RAlO3 (R = Y, La, Gd, Yb, Lu) Perovskites
Zhydachevskyy, Yaroslav; Hizhnyi, Yuriy; Nedilko, Sergii G.; Kudryavtseva, Irina; Pankratov, Vladimir; Stasiv, Vasyl; Vasylechko, Leonid; Sugak, Dmytro; Lushchik, Aleksandr; Berkowski, Marek; Suchocki, Andrzej; Klyui, Nickolai (American Chemical Society, 2021)The possibility of band gap engineering (BGE) in RAlO3(R = Y, La, Gd, Yb, Lu) perovskites in the context of trap depths of intrinsic point defects was investigated comprehensively using experimental and theoretical approaches. ... -
Chlorine Adsorption on TiO2(110)/Water Interface: Nonadiabatic Molecular Dynamics Simulations for Photocatalytic Water Splitting
Lin, Yin-Pai; Bocharov, Dmitry; Isakoviča, Inta; Pankratov, Vladimir; Popov, Aleksandr A.; Popov, Anatoli I.; Piskunov, Sergei (MDPI, 2023)Chloride is one of the most abundant ions in sea water, which is more available than fresh water. Due to lack of H2O adsorbate states near the valence band maximum (VBM) edge, the difficulty of water dissociation incidents ... -
Exciton interaction with Ce3+ and Ce4+ ions in (LuGd)3(Ga,Al)5O12 ceramics
Khanin, Vasilii; Venevtsev, Ivan; Chernenko, Kirill; Pankratov, Vladimir; Klementiev, Konstantin; van Swieten, Thomas; van Bunningen, Arnoldus J.; Vrubel, Ivan; Shendrik, Roman; Ronda, Cees; Rodnyi, Piotr; Meijerink, Andries (Elsevier B.V., 2021)Scintillators based on Ce-doped garnets are regularly co-doped with Mg2+ or Ca2+ to form Ce ions in 4+ state and reduce undesired afterglow. However overly high Ce4+ concentration leads to poor light yield performance. In ... -
Filterless Visible-Range Color Sensing and Wavelength-Selective Photodetection Based on Barium/Nickel Codoped Bandgap-Engineered Potassium Sodium Niobate Ferroelectric Ceramics
Balanov, Vasilii A.; Temerov, Filipp; Pankratov, Vladimir; Cao, Wei; Bai, Yang (Wiley-Blackwell, 2023)Photosensors, photodetectors, or color sensors are key components for various optical and optoelectronic applications. Semiconductor-based photodetection has been a dominator which is excellent at measuring the photon ... -
First Principles Calculations of Atomic and Electronic Structure of Ti3+Al- and Ti2+Al-Doped YAlO3
Piskunov, Sergei; Gopejenko, Aleksejs; Pankratov, Vladimir; Isakovica, Inta; Chong-Geng, Ma; Brik, Mikhail G.; Piasecki, Michal; Popov, Anatoli I. (Multidisciplinary Digital Publishing Institute (MDPI), 2021)In this paper, the density functional theory accompanied with linear combination of atomic orbitals (LCAO) method is applied to study the atomic and electronic structure of the Ti3+ and Ti2+ ions substituted for the host ... -
Flexible nanosheets for plasmonic photocatalysis: microwave-assisted organic synthesis of Ni–NiO@Ni2CO3(OH)2 core–shell@sheet hybrid nanostructures
Rani, Ekta; Talebi, Parisa; Pulkkinen, Terhi; Pankratov, Vladimir; Singh, Harishchandra (Royal Society of Chemistry, 2023)Visible light-active nickel-based plasmonic photocatalysts provide a cost-effective alternative to noble metals. However, their rarity, fragility, and limited understanding pose challenges. This work presents a microwave-assisted ... -
Improvement of Heat Dissipation in Ag/Ni Substrates for Testing Cu-TiO2/TiO2-Modified Filters Using SERS Spectroscopy
Bandarenka, Hanna; Burko, Aliaksandr; Girel, Kseniya; Laputsko, Diana; Orel, Elizaveta; Mizgailo, Anna; Sharopov, Utkirjon; Podelinska, Alise; Shapel, Uladzislau; Pankratov, Vladimir; Piskunov, Sergei; Bocharov, Dmitry (MDPI, 2023)Surface-enhanced Raman scattering (SERS) spectroscopy is used to investigate a composition of wash swabs from the Cu-TiO2/TiO2-modified filters with disinfecting ability. Macroporous Si chips coated with conformal 800 nm ... -
Low-temperature luminescence of ScF3 single crystals under excitation by VUV synchrotron radiation
Pankratova, Viktorija; Purans, Juris; Pankratov, Vladimir (American Institute of Physics, 2020)Photoluminescence and excitation spectra of ScF3 single crystals have been measured under vacuum ultraviolet excitations utilizing undulator synchrotron radiation from 1.5 GeV storage ring of MAX IV synchrotron. The emission ... -
Luminescence and vacuum ultraviolet excitation spectroscopy of cerium doped Gd3Ga3Al2O12 single crystalline scintillators under synchrotron radiation excitations
Kozlova, Anna P.; Kasimova, Valentina M.; Buzanov, Oleg A.; Chernenko, Kirill; Klementiev, Konstantin; Pankratov, Vladimir (Elsevier B.V., 2020)Cerium doped Gd3Ga3Al2O12 (GGAG) single crystals as well as GGAG:Ce single crystals co-doped by divalent (Mg2+, Ca2+), trivalent (Sc3+) or tetravalent (Zr4+, Ti4+) ions have been studied by means of the excitation luminescence ... -
Luminescence properties and time-resolved spectroscopy of rare-earth doped SrMoO4 single crystals
Pankratova, Viktorija; Dunaeva, Elizaveta E.; Voronina, Irina S.; Kozlova, Anna P.; Shendrik, D.; Pankratov, Vladimir (Elsevier, 2022)Luminescence properties of nominally pure and doped with Eu3+ and Pr3+ ions SrMoO4 single crystals grown by the Czochralski method have been studied. Thermal quenching of intrinsic emission of pure and doped SrMoO4 single ... -
Optical properties of powder and ceramics of aluminium oxynitride obtained by self-propagating high-temperature synthesis
Akopdzhanyan, T.G.; Kondakov, A.A.; Rupasov, S.I.; Kozlova, A.P.; Pankratov, Vladimir (Lithuanian Physical Society, 2021)The synthesis method of aluminium oxynitride (AlON) powders by nitriding of Al/Al2 O3 mixture under high-pressure nitrogen is proposed. The novelty of this method consists in adding KClO4 or Mg(ClO4 )2 and extra Al into ... -
Performance and characterization of the FinEstBeAMS beamline at the MAX IV Laboratory
Chernenko, Kirill; Kivimaki, Antti; Pärna, Rainer; Wang, Weimin; Sankari, Rami; Leandersson, Mats; Tarawneh, Hamed; Pankratov, Vladimir; Kook, Mati; Kukk, Edwin; Reisberg, Liis; Urpelainen, Samuli; Käämbre, Tanel; Siewert, Frank; Gwalt, Grzegorz; Sokolov, Andrey; Lemke, Stephanie; Alimov, Svyatoslav; Knedel, Jeniffa; Kutz, Oliver; Seliger, Tino; Valden, Mika; Hirsimäki, Mika; Kirm, Marco; Huttula, Marko (Wiley-Blackwell, 2021)FinEstBeAMS (Finnish-Estonian Beamline for Atmospheric and Materials Sciences) is a multidisciplinary beamline constructed at the 1.5 GeV storage ring of the MAX IV synchrotron facility in Lund, Sweden. The beamline covers ... -
Progress in development of a new luminescence setup at the FinEstBeAMS beamline of the MAX IV laboratory
Pankratov, Vladimir; Pärna, Rainer; Kirm, Marko; Nagirnyi, Vitali; Nõmmiste, Ergo; Omelkov, Sergei; Vielhauer, Sebastian; Chernenko, Kirill; Reisberg, Liis; Turunen, Paavo; Kivimäki, Antti; Kukk, Edwin; Valden, Mika; Huttula, Marko (Elsevier Ltd, 2019)FinEstBeAMS is a new materials science beamline at the 1.5 GeV storage ring of the MAX IV Laboratory in Lund, Sweden. It has been built based on grazing incidence monochromatization of synchrotron light, which allows to ... -
Selective Disintegration–Milling to Obtain Metal-Rich Particle Fractions from E-Waste
Blumbergs, Ervins; Serga, Vera; Shishkin, Andrei; Goljandin, Dmitri; Shishko, Andrej; Zemcenkovs, Vjaceslavs; Markus, Karlis; Baronins, Janis; Pankratov, Vladimir (MDPI, 2022)Various metals and semiconductors containing printed circuit boards (PCBs) are abundant in any electronic device equipped with controlling and computing features. These devices inevitably constitute e-waste after the end ... -
Study of Metal Leaching from Printed Circuit Boards by Improved Electrochemical Hydrochlorination Technique Using Alternating Current
Serga, Vera; Zarkov, Aleksej; Shishkin, Andrei; Elsts, Edgars; Melnichuks, Maksims; Maiorov, Mikhail; Blumbergs, Ervins; Pankratov, Vladimir (MDPI, 2023)This paper presents the results of the leaching of metals from computer PCBs by electrochemical hydrochlorination using alternating current (AC) with an industrial frequency (50 Hz). Leaching was carried out with a ... -
Study of phase composition, photocatalytic activity, and photoluminescence of TiO2 with Eu additive produced by the extraction-pyrolytic method
Serga, Vera; Burve, Regina; Krumina, Aija; Pankratova, Viktorija; Popov, Anatoli I.; Pankratov, Vladimir (Elsevier, 2021)Due to the unique properties and wide array of applications of nanocrystalline materials based on titanium dioxide, the study of new synthesis approaches remains relevant. In this study, within the framework of the ... -
Study of the Effect of Two Phases in Li4SiO4–Li2SiO3 Ceramics on the Strength and Thermophysical Parameters
Kozlovskiy, Artem; Shlimas, Dmitriy I.; Zdorovets, Maxim V.; Moskina, Aleksandra; Pankratov, Vladimir; Popov, Anatoli I. (MDPI, 2022)The paper studies the effect of Li2SiO3/Li4SiO4 phase formation in lithium-containing ceramics on the strength and thermophysical characteristics of lithium-containing ceramics, which have great prospects for use as blanket ... -
Study of the structural and morphological characteristics of the CdxTeyOz nanocomposite obtained on the surface of the CdS/ZnO heterostructure by the SILAR method
Suchikova, Yana; Kovachov, Sergii; Bohdanov, Ihor; Karipbaev, Zhakyp T.; Pankratov, Vladimir; Popov, Anatoli I. (Springer, 2023)CdxTeyOz nanocomposite films were grown by the SILAR method on the CdS/ZnO surface during cyclic processing in precursor solutions followed by removal of excess reagent from the surface of the substrate by washing in ...