Cietvielu fizikas institūts / Institute of Solid State Physics: Recent submissions

Now showing items 281-300 of 652

    • Ultrafast luminescence of Ga- and In-doped ZnO ceramics 

      Rodnyi, Piotr; Venevtsev, Ivan; Gorokhova, Elena; Eron'ko, Sergei; Chizhov, Artem; Muktepavela, Faina (Elsevier, 2021)
      In the presented work we compare luminescence characteristics of ZnO:Ga and ZnO:In ceramics prepared by hot uniaxial pressing method. Two types of initial powders were used. The first one was nanosized powder prepared by ...

    • Toward On-Line Slag Composition Analysis: Optical Emissions from Laboratory Electric Arc 

      Pauna, H.; Tuomela, A.; Aula, M.; Turunen, P.; Pankratov, Vladimir; Huttula, M.; Fabritius, T. (Springer, 2021)
      Electric arc furnaces and ladle furnaces have an important role in the future of steelmaking where CO 2 emissions have to be mitigated to an acceptable level. One way to address this goal is to optimize and improve the ...

    • Time-resolved FDTD and experimental FTIR study of gold micropatch arrays for wavelength-selective mid-infrared optical coupling 

      Fu, Ying; Yager, Tom; Chikvaidze, George; Iyer, Srinivasan; Wang, Qin (Multidisciplinary Digital Publishing Institute (MDPI), 2021)
      Infrared radiation reflection and transmission of a single layer of gold micropatch two-dimensional arrays, of patch length ∼1.0 µm and width ∼0.2 µm, have been carefully studied by a finite-difference time-domain (FDTD) ...

    • Time-Dependent Density Functional Theory Calculations of N- and S-Doped TiO2 Nanotube for Water-Splitting Applications 

      LIN, YIN-PAI; Isakoviča, Inta; Gopejenko, Aleksejs; Ivanova, Anna; Začinskis, Aleksandrs; Eglitis, Roberts; D’Yachkov, Pavel N.; Piskunov, Sergei (Multidisciplinary Digital Publishing Institute (MDPI), 2021)
      On the basis of time-dependent density functional theory (TD-DFT) we performed first-principle calculations to predict optical properties and transition states of pristine, N-and S-doped, and N+S-codoped anatase TiO2 ...

    • Tendencies in abo3 perovskite and srf2, baf2 and caf2 bulk and surface f‐center ab initio computations at high symmetry cubic structure 

      Eglitis, Roberts I.; Purans, Juris; Popov, Anatoli I.; Jia, R. (Multidisciplinary Digital Publishing Institute (MDPI), 2021)
      We computed the atomic shift sizes of the closest adjacent atoms adjoining the (001) surface F‐center at ABO3 perovskites. They are significantly larger than the atomic shift sizes of the closest adjacent atoms adjoining ...

    • The electronic properties of SrTiO3-δ with oxygen vacancies or substitutions 

      Rusevich, Leonid L.; Tyunina, M.; Kotomin, Eugene; Nepomniashchaia, N.; Dejneka, A. (Springer Nature, 2021)
      The electronic properties, including bandgap and conductivity, are critical for nearly all applications of multifunctional perovskite oxide ferroelectrics. Here we analysed possibility to induce semiconductor behaviour in ...

    • Studies of the possibilities to use ozone for the grain storage 

      Rucins, Adolfs; Straumite, Evita; Viesturs, Dainis; Kristins, Alberts (Rezekne Higher Education Institution, 2021)
      In this study was impact of ozone treatment efficiency of wheat quality (physical-chemical and microbiological parameters, chemical composition and germination rate) during storage analysed. Ozone is a powerful oxidizer, ...

    • Radiation-induced stable radicals in calcium phosphates: Results of multifrequency epr, ednmr, eseem, and endor studies 

      Murzakhanov, Fadis F.; Grishin, Peter O.; Goldberg, Margarita A.; Yavkin, Boris V.; Mamin, Georgy V.; Orlinskii, Sergei B.; Fedotov, Alexander Yu.; Petrakova, Natalia V.; Antuzevics, Andris; Gafurov, Marat R.; Komlev, Vladimir S. (Multidisciplinary Digital Publishing Institute (MDPI), 2021)
      This article presents the results of a study of radiation-induced defects in various synthetic calcium phosphate (CP) powder materials (hydroxyapatite—HA and octacalcium phosphate—OCP) by electron paramagnetic resonance ...

    • 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 ...

    • Optimization of gyrotron resonator’s dimensions 

      Kacper Nowak, Kacper; Dumbrajs, Olgerts (National Institute of Telecommunications, 2021)
      This paper explains the procedure of determining the initial dimensions of a gyrotron resonator. In particular, the paper discusses which geometrical parameters impact the wave properties of the resonator. The solution is ...

    • Nonlinear absorption and refraction of picosecond and femtosecond pulses in HgTe quantum dot films 

      Bindulis, Arturs; Shuklov, Ivan A.; Kim, Vyacheslav V.; Mardini, Alaa A.; Grube, Jurgis; Alnis, Janis; Lizunova, Anna; Razumov, Vladimir F.; Ganeev, Rashid A. (Multidisciplinary Digital Publishing Institute (MDPI), 2021)
      We report measurements of the saturated intensities, saturable absorption, and nonlinear refraction in 70-nm thick films containing 4 nm HgTe quantum dots. We demonstrate strong nonlinear refraction and saturable absorption ...

    • 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 ...

    • Kinking in Semiconductor Nanowires: A Review 

      Vlassov, Sergei; Oras, Sven; Polyakov, Boris; Butanovs, Edgars; Kyritsakis, Andreas; Zadin, Veronika (American Chemical Society, 2022)
      The growth direction of nanowires (NWs) can change during synthesis as a result of stochastic processes or modulation of certain growth conditions. This phenomenon is known as kinking. Although deviations from a uniform ...

    • 2d slab models of nanotubes based on tetragonal tio2 structures: Validation over a diameter range 

      Lisovski, Oleg; Piskunov, Sergei; Bocharov, Dmitry; Kenmoe, Stephane (Multidisciplinary Digital Publishing Institute (MDPI), 2021)
      One-dimensional nanomaterials receive much attention thanks to their advantageous properties compared to simple, bulk materials. A particular application of 1D nanomaterials is pho-tocatalytic hydrogen generation from ...

    • In Situ Regeneration of Copper-Coated Gas Diffusion Electrodes for Electroreduction of CO2 to Ethylene 

      Bisztyga-Szklarz, Magdalena; Mech, Krzysztof; Marzec, Mateusz; Kalendarev, Robert; Szaciłowski, Konrad (Multidisciplinary Digital Publishing Institute (MDPI), 2021)
      A key challenge for carbon dioxide reduction on Cu-based catalysts is its low faradic efficiency (FE) and selectivity towards higher-value products, e.g., ethylene. The main factor limiting the possibilities of long-term ...

    • Influence of cation order on the dielectric properties of (1 - x)Pb(Sc0:5Nb0:5)O3-xPb(Yb0:5Nb0:5)O3ceramics 

      Garbarz-Glos, Barbara; Bąk, Wojciech; Antonova, Maija; Kalvane, Anna; Kajtoch, Czeslaw; Dulian, Piotr (Walter de Gruyter, 2021)
      Ceramic lead niobates and their solid solutions (1 - x)Pb(Sc0:5Nb0:5)O3 - xPb(Yb0:5Nb0:5)O3 were synthesized by solid state reactions from oxides. The structure of investigated samples was characterized by X-ray diffraction ...

    • Impact of thermal treatment on the surface of na0.5bi0.5tio3-based ceramics 

      Bikse, Liga; Dunce, Marija; Birks, Eriks; Kundzins, Karlis; Freimanis, Otto; Livins, Maris; Gabrusenoks, Jevgenijs; Sternberg, Andris (Multidisciplinary Digital Publishing Institute (MDPI), 2021)
      Thermal etching is a widely accepted surface treatment method for studying microstructure in Na0.5Bi0.5TiO3-based compositions. Surprisingly, besides the flat pattern of grains (suitable for evaluating ceramics’ microstructure), ...

    • High-pressure synthesis of boron-rich chalcogenides B12S and B12Se 

      Cherednichenko, Kirill A.; Mukhanov, Vladimir A.; Kalinko, Aleksandr; Solozhenko, Vladimir L. (Elsevier, 2022)
      Two boron-rich chalcogenides B12S and B12Se isostructural to α-rhombohedral boron were synthesized by chemical reaction of the elements at high-pressure – high-temperature conditions. The crystal structures and stoichiometries ...

    • Computer Simulation of the Electric Transport Properties of the FeSe Monolayer 

      Sergeyev, D.; Zhanturina, N.; Myasnikova, L.; Popov, Anatoli I.; Duisenova, A.; Istlyaup, A. (Walter de Gruyter, 2020)
      The paper deals with the model research of electric transport characteristics of stressed and non-stressed FeSe monolayers. Transmission spectra, current-voltage characteristic (CVC) and differential conductivity spectra ...

    • Composite material recycling technology—state-of-the-art and sustainable development for the 2020s 

      Krauklis, Andrey E.; Karl, Christian W.; Gagani, Abedin I.; Jørgensen, Jens K. (Multidisciplinary Digital Publishing Institute (MDPI), 2021)
      Recently, significant events took place that added immensely to the sociotechnical pressure for developing sustainable composite recycling solutions, namely (1) a ban on composite landfilling in Germany in 2009, (2) the ...