Browsing Zinātniskie raksti (CFI) / Scientific articles by Title

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    • Pair vacancy defects in β-Ga2O3 crystal: Ab initio study 

      Usseinov, Abay; Platonenko, Aleksander; Koishybayeva, Zhanymgul; Zdorovets, Maxim; Popov, Anatoli I. (Elsevier, 2022)
      Despit many studies dedicated to the defects in β-Ga2O3, information about formation processes of complex “donor-acceptor” defects in β-Ga2O3 and their energetic characteristics is still very scarce. Meanwhile, complex ...

    • Paramagnetic Defects and Thermoluminescence in Irradiated Nanostructured Monoclinic Zirconium Dioxide 

      Ananchenko, Daria V.; Nikiforov, Sergey V.; Sobyanin, Konstantin V.; Konev, Sergey F.; Dauletbekova, Alma K.; Akhmetova-Abdik, Gulzhanat; Akilbekov, Abdirash T.; Popov, Anatoli I. (MDPI, 2022)
      The ESR spectra of nanostructured samples of monoclinic ZrO2 irradiated by electrons with energies of 130 keV, 10 MeV, and by a beam of Xe ions (220 MeV) have been studied. It has been established that irradiation of samples ...

    • Particle size effects on the structure and emission of Eu3+:LaPO4 and EuPO4 phosphors 

      Gavrilović, Tamara; Periša, Jovana; Papan, Jelena; Vuković, Katarina; Smits, Krisjanis; Jovanović, Dragana J.; Dramićanin, Miroslav D. (Elsevier B.V., 2018)
      This paper provides the detailed study of (nano)particle's size effect on structural and luminescent properties of LaPO4:Eu3+ synthesized by four different methods: high temperature solid-state, co-precipitation, reverse ...

    • Peculiarities of Phase Formation in Mn-Based Na SuperIonic Conductor (NaSICon) Systems: The Case of Na1+2 xMnxTi2- x(PO4)3(0.0 ≤ x ≤ 1.5) 

      Snarskis, Gustautas; Pilipavičius, Jurgis; Gryaznov, Denis; Mikoliū Naitė, Lina; Vilčiauskas, Linas (American Chemical Society, 2021)
      NAtrium SuperIonic CONductor (NASICON) structured phosphate framework compounds are attracting a great deal of interest as suitable electrode materials for "rocking chair"type batteries. Manganese-based electrode materials ...

    • Peculiarities of the diffusion-controlled radiation defect accumulation kinetics under high fluencies 

      Kuzovkov, Vladimir N.; Kotomin, Eugene A.; Popov, Anatoli I.; Vila, Rafael (Elsevier B.V., 2020)
      Theory is developed for kinetics of the diffusion-controlled radiation defect accumulation in crystalline solids under high fluencies taking into account recently observed correlation between the defect diffusion energy ...

    • Peculiarities of the local structure in new medium- and high-entropy, low-symmetry tungstates 

      Bakradze, Georgijs; Welter, Edmund; Kuzmin, Alexei (Elsevier, 2022)
      New monoclinic (/) tungstates – a medium-entropy tungstate, (MnNiCuZn)WO4, and a high-entropy tungstate, (MnCoNiCuZn)WO4 – were synthesized and characterized. Their phase purity and solid solution nature were confirmed by ...

    • 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 ...

    • Permanent photodoping of plasmonic gallium-ZnO nanocrystals 

      Zukuls, Anzelms; Eglītis, Raivis; Käämbre, Tanel; Ignatans, Reinis; Šmits, Krišjānis; Rubenis, Kristaps; Začs, Dzintars; Šutka, Andris (Royal Society of Chemistry, 2020)
      Donor dopants in oxide semiconductors are compensated not only by valuable electrons but also by other point defects, leading to a decrease in electric conductivity and infrared absorption. We demonstrate that the electron ...

    • Perovskite CH3NH3PbI3–XClx Solar Cells and their Degradation (Part 1: A Short Review) 

      Kaulachs, I.; Ivanova, A.; Tokmakov, Andrei; Roze, M.; Mihailovs, Igors; Rutkis, Martins (De Gruyter, 2021)
      Development of hybrid organic-inorganic perovskite solar cells (PSC) has been one of the hottest research topics since 2013. Within brief literature review, we would like to achieve two objectives. Firstly, we ...

    • Perovskite CH3NH3PbI3–XClx Solar Cells. Experimental Study of Initial Degradation Kinetics and Fill Factor Spectral Dependence 

      Kaulachs, I.; Ivanova, A.; Holsts, A.; Roze, M.; Flerov, A.; Tokmakov, Andrei; Mihailovs, Igors; Rutkis, Martins (De Gruyter, 2021)
      The main drawback of the methylammonium lead halide perovskite solar cells is their degradation in ambient atmosphere. To investigate ambient-air-induced cell degradation, spec-tral dependencies of open-circuit ...

    • Phase stability and oxygen-sensitive photoluminescence of ZrO2:Eu,Nb nanopowders 

      Kiisk, Valter; Puust, Laurits; Mändar, Hugo; Ritslaid, Peeter; Rähn, Mihkel; Bite, Ivita; Jankovica, Dzidra; Sildos, Ilmo; Jaaniso, Raivo (Elsevier B.V., 2018)
      We studied structure and oxygen-sensitive photoluminescence (PL) of ZrO2:Eu,Nb nanocrystalline powders synthesized via a sol-gel route and heat-treated up to 1200 °C. The material containing only 2 at% Eu3+ was predominantly ...

    • Phase transitions and upconversion luminescence in oxyfluoride glass ceramics containing Ba4Gd3F17 nanocrystals 

      Krieke, Guna; Sarakovskis, Anatolijs; Ignatans, Reinis; Gabrusenoks, Jevgenijs (Elsevier B.V., 2017)
      Novel transparent Er3+ doped oxyfluoride glass-ceramics containing Ba4Gd3F17 nanocrystals were prepared by melt quenching followed by heat treatment of as-prepared glasses. The phase composition and microstructure were ...

    • Photocatalytic Activity of TiO2 Coatings Obtained at Room Temperature on a Polymethyl Methacrylate Substrate 

      Iesalnieks, Mairis; Eglītis, Raivis; Juhna, Tālis; Šmits, Krišjānis; Šutka, Andris (MDPI, 2022)
      Titanium dioxide (TiO2) coatings have a wide range of applications. Anatase exhibits hydrophilic, antimicrobial, and photocatalytic properties for the degradation of organic pollutants or water splitting. The main challenge ...

    • Photoconductivity & photoelectron emission of LiGaO2 crystal excited in intrinsic absorption range 

      Trukhin, Anatoly N.; Trinkler, Laima E. (Elsevier B.V., 2019)
      The photoelectric response spectra were studied in a LiGaO2 crystal. The obtained spectra were interpreted as the release and diffusion of charge carriers, as well as external photoemission of electrons. The charge carrier ...

    • Photoelectric fields in doped lithium niobate crystals 

      Sidorov, N. V.; Shuvalova, A. M.; Yanichev, A. A.; Teplyakova, N. A.; Palatnikov, M. N.; Bormanis, Kārlis (Taylor & Francis, 2019)
      Photoinduced light scattering (PILS) in nominally pure stoichiometric and congruent lithium niobate single crystals (LiNbO3), and ones doped with B³⁺, Cu²⁺, Zn²⁺, Mg²⁺, Gd³⁺, Y³⁺, Er³⁺ cations was studied. All crystals ...

    • Photoelectric response of localized states in silica glass 

      Trukhin, Anatoly N. (Elsevier B.V., 2019)
      The photoelectric response of pure silica glasses excited by excimer lasers has been studied. The samples were made under various conditions. Photoelectric polarization of samples due to the Dember effect has been registered. ...

    • Photoluminescence and Electron Spin Resonance of ilicon Dioxide Crystal with Rutile Structure (Stishovite) 

      Trukhin, Anatoly; Antuzevics, Andris (Wiley-VCH GmbH, 2018)
      An electron spin resonance (ESR) and photoluminescence signal is observed in the as grown single crystal of stishovite indicating the presence of defects in the non‐irradiated sample. The photoluminescence of the as received ...

    • Photophysical and Electrical Properties of Highly Luminescent 2/6-Triazolyl-Substituted Push-Pull Purines 

      Sebris, Armands; Novosjolova, Irina; Traskovskis, Kaspars; Kokars, Valdis; Tetervenoka, Natalija; Vembris, Aivars; Turks, Māris (American Chemical Society, 2022)
      New push-pull N(9)-alkylated 6-piperidino-2-triazolylpurine and 2-piperidino-6-triazolylpurine derivatives are synthesized, and their optical and optoelectronic properties are comprehensively characterized with experimental ...

    • Plasma Dynamics Characterization for Improvement of Resonantly Enhanced Harmonics Generation in Indium and Tin Laser-Produced Plasmas 

      Kim, Vyacheslav V.; Butikova, Jelena; Grube, Jurgis; Sarakovskis, Anatolijs; Ganeev, Rashid A. (MDPI, 2022)
      In this study, we characterize the properties of indium and tin laser-induced plasmas responsible for efficient high-order harmonics generation of the ultrashort pulses propagating through these media. The optimally formed ...

    • Plasma-wall interaction studies within the EUROfusion consortium: Progress on plasma-facing components development and qualification 

      Brezinsek, Sebastijan; Coenen, J. W.; Schwarz-Selinger, Thomas; Schmid, Klaus; Kirschner, Andreas; Hakola, Antti H.; Tabarés, Francisco L.; van der Meiden, Hennie J.; Mayoral, Marie Line; Reinhart, Michael; Tsitrone, Emmanuelle; Ahlgren, Tommy; Aints, Märt H.; Airila, Markus I.; Almaviva, Salvatore; Alves, E.; Angot, Thierry; Aniţa, Viorel; Arredondo Parra, R.; Friedrich, Aumayr; Balden, Martin; Bauer, J.; Ben Yaala, Marwa; Berger, Bernhard M.; Bisson, Régis; Björkas, C. ; Bogdanovic Radovic, I. ; Borodin, D. ; Bucalossi, J. ; Butikova, Jelena;  Butoi, B.; Čadež, I. ; Caniello, R. ; Caneve, L. ; Cartry, G. ;  Catarino, N.; Čekada, M. ;  Ciraolo, G.; Ciupinski, L. ; Colao, F. ;  Corre, Y.; Costin, C. ; Craciunescu, T. ; Cremona, A. ; De Angeli, M. ;  de Castro, A.; Dejarnac, R. ; Dellasega, D. ; Dinca, P. ; Dittmar, T. ; Dobrea, C. ; Hansen, P. ; Drenik, A. ; Eich, T. ; Elgeti, S. ; Falie, D. ;  Fedorczak, N.; Ferro, Y. ; Fornal, T. ; Fortuna-Zalesna, E. ; Gao, L. ;  Gasior, P.;  Gherendi, M.; Ghezzi, F. ; Gosar, Ž. ; Greuner, H. ; Grigore, E. ; Grisolia, C. ; Groth, M. ;  Gruca, M.; Grzonka, J. ;  Gunn, J.P.; Hassouni, K. ;  Heinola, K.; Höschen, T. ; Huber, S. ; Jacob, W. ; Jepu, I. ; Jiang, X. ;  Jogi, I.;  Kaiser, A.;  Karhunen, J.;  Kelemen, M.; Köppen, M. ;  Koslowski, H.R.; Kreter, A. ; Kubkowska, M. ; Laan, M. ; Laguardia, L. ; Lahtinen, A. ; Lasa, A. ;  Lazic, V.;  Lemahieu, N.; Likonen, J. ;  Linke, J.;  Litnovsky, A.; Linsmeier, Ch. ; Loewenhoff, T. ; Lungu, C. ; Lungu, M. ; Maddaluno, G. ;  Maier, H.; Makkonen, T. ; Manhard, A. ; Marandet, Y. ;  Markelj, S.; Marot, L. ;  Martin, C.;  Martin-Rojo, A.B.; Martynova, Y. ; Mateus, R. ; Matveev, D. ; Mayer, M. ; Meisl, G. ; Mellet, N. ;  Michau, A.; Miettunen, J. ;  Möller, S.;  Morgan, T.W.; Mougenot, J. ; Mozetič, M. ; Nemanič, V. ; Neu, R. ; Nordlund, K. ; Oberkofler, M. ; Oyarzabal, E. ;  Panjan, M.; Pardanaud, C. ;  Paris, P.; Passoni, M. ; Pegourie, B. ; Pelicon, P. ;  Petersson, P.; Piip, K. ; Pintsuk, G. ; Pompilian, G.O. ; Popa, G. ; Porosnicu, C. ; Primc, G. ;  Probst, M.; Räisänen, J. ; Rasinski, M. ; Ratynskaia, S. ; Reiser, D. ;  Ricci, D.; Richou, M. ; Riesch, J. ;  Riva, G.; Rosinski, M. ; Roubin, P. ; Rubel, M. ; Ruset, C. ; Safi, E. ; Sergienko, G. ; Siketic, Z. ; Sima, A. ; Spilker, B. ; Stadlmayr, R. ;  Steudel, I.; Ström, P. ; Tadic, T. ; Tafalla, D. ;  Tale, I.; Terentyev, D. ; Terra, A. ; Tiron, V. ; Tiseanu, I. ; Tolias, P. ; Tskhakaya, D. ;  Uccello, A.; Unterberg, B. ; Uytdenhoven, I. ; Vassallo, E. ;  Vavpetič, P.; Veis, P. ; Velicu, I.L. ;  Vernimmen, J.W.M.; Voitkans, Arnis; von Toussaint, U. ; Weckmann, A. ; Wirtz, M. ; Založnik, A. ; Zaplotnik, R. ; WP PFC, contributors (Institute of Physics Publishing, 2018)
      The provision of a particle and power exhaust solution which is compatible with first-wall components and edge-plasma conditions is a key area of present-day fusion research and mandatory for a successful operation of ITER ...