Browsing Cietvielu fizikas institūts / Institute of Solid State Physics by Issue Date

Now showing items 21-40 of 561

    • First-principles calculations on Fe-Pt nanoclusters of various morphologies 

      Platonenko, Alexander; Piskunov, Sergei; Bocharov, Dmitry; Zhukovskii, Yuri F.; Evarestov, Robert A.; Bellucci, Stefano (Nature Publishing Group, 2017)
      Bimetallic FePt nanoparticles with L1 0 structure are attracting a lot of attention due to their high magnetocrystalline anisotropy and high coercivity what makes them potential material for storage of ultra-high density ...

    • Influence of the preparation method on planar perovskite CH3NH3PbI3-xClx solar cell performance and hysteresis 

      Ivanova, Alesja; Lebedeva, Kristina; Roze, M.; Kaulachs, I.; Tokmakov, Andrey (De Gruyter Open Ltd, 2017)
      Organometal halide perovskites are promising materials for lowcost, high-efficiency solar cells. The method of perovskite layer deposition and the interfacial layers play an important role in determining the efficiency of ...

    • Nitrogen adsorption on graphene sponges synthesized by annealing a mixture of nickel and carbon powders 

      Grehov, V.; Kalnacs, J.; Mishnev, A.; Kundzins, Karlis (De Gruyter Open Ltd, 2017)
      Adsorption by graphene sponge (GS) manufactured by annealing nickel-carbon powder mixture in inert atmosphere has been studied. By determining the specific surface area (SSA) for the GS sample, it has been found that ...

    • Structure, tritium depth profile and desorption from ‘plasma-facing’ beryllium materials of ITER-Like-Wall at JET 

      Pajuste, Elina; Kizane, Gunta; Igaune, Ieva; Avotina, Liga; Zarins, Roberts; Vitins, Aigars (Elsevier Ltd, 2017)
      Tritium depth profile and its temperature programmed desorption rate were determined for selected samples cut out of beryllium tiles removed from the Joint European Torus vacuum vessel during the 2012 shut down. A beryllium ...

    • Behaviour of thermal expansion of (1-x)Pb(Ni1/3Nb2/3)O3–xPbTiO3 solid solutions 

      Bormanis, Karlis; Gorev, Mikhail G.; Flerov, Igor N.; Sternberg, Andris; Lace, Lelde; Ignatans, Reinis; Kalvane, Anna; Antonova, Maija (Estonian Academy Publishers, 2017)
      The features of the dependence of the bulk coefficient of thermal expansion of the (1-x)Pb(Ni1/3Nb2/3)O3-xPbTiO3 solid solution studied in the series of x = 0-0.8 in the temperature range from 100 to 750 K are reported. ...

    • Complex multilayer carbon structures for green energetics 

      Lesnicenoks, Peteris; Berzina, Astrida; Lukoševičš, Ingars; Grinberga, Liga; Jekabsons, Laimonis; Kleperis, Janis; Knite, Maris; Taurins, Gatis (Estonian Academy Publishers, 2017)
      We investigated a promising material for hydrogen storage and sensing. The material was obtained by exfoliating recycled graphite waste and simultaneously modifying the product with metal impurities (Bi, V, Cu). As a ...

    • Influence of uniaxial pressure on dielectric properties of (1-x)Na0.5Bi0.5TiO3–xSrTiO3 for x = 0.01, 0.04, and 0.1 ceramics 

      Czaja, Piotr; Suchanicz, Jan; Kluczewska, Kamila; Sitko, Dorota; Dutkiewicz, Erazm Maria; Konieczny, Krzysztof; Węgrzyn, Adrian; Antonova, Maija; Sternberg, Andris (Estonian Academy Publishers, 2017)
      The conventional solid-state sintering was applied to synthesized (1-x)Na0.5Bi0.5TiO3-xSrTiO3 (x = 0.01, 0.04, and 0.1) ceramics. Dielectric measurements of these ceramics were taken in the temperature range from 20 to 600 ...

    • Thermal disorder and correlation effects in anti-perovskite-type copper nitride 

      Timoshenko, Janis; Anspoks, Andris; Kalinko, Alexandr; Kuzmin, Alexei (Elsevier Ltd, 2017)
      Reverse Monte Carlo simulations coupled with evolutionary algorithm were employed for the analysis of the temperature dependent (10–300 K) Cu K-edge extended X-ray absorption fine structure (EXAFS) spectra of polycrystalline ...

    • Electric relaxation and Mn3+/Mn4+ charge transfer in Fe-doped Bi12MnO20–BiMn2O5 structural self-composite 

      Leonarska, A.; Kadziołka-Gaweł, M.; Szeremeta, A. Z.; Bujakiewicz-Koronska, R.; Molak, A.; Kalvane, Anna (Springer New York LLC, 2017)
      Fe-doped Bi12MnO20–BiMn2O5 ceramics was sintered at 1130 K for 6 h in ambient air. Two centro-symmetric phases formed thermodynamically stable self-composite material that was deduced from X-ray pattern analysis. The lattice ...

    • Luminescence of X-ray induced radiation defects in modified lithium orthosilicate pebbles with additions of titanium dioxide 

      Cipa, Janis; Kizane, Gunta; Supe, Arnis; Zolotarjovs, Aleksejs; Zarins, Arturs; Baumane, Larisa (Lithuanian Academy of Sciences Publishers, 2017)
      Modified lithium orthosilicate (Li4SiO4) pebbles with additions of titanium dioxide (TiO2) are designed as a possible tritium breeder ceramic for the helium cooled pebble bed (HCPB) test blanket module. Additions of TiO2 ...

    • Modified graphene sheet stacks for hydrogen binding 

      Lesnicenoks, Peteris; Zemitis, Janis; Grinberga, Liga; Chikvaidze, George; Kleperis, Janis; Urbonavičius, Marius; Tačkute, Simona; Milčius, Darius (Kauno Technologijos Universitetas, 2017)
      Graphene sheet stacks were obtained using electrochemical exfoliation method. The morphology, distribution of elements and structure of the obtained samples were investigated using scanning electron microscopy, energy ...

    • Target transportation of auxin on mesoporous Au/SiO2 nanoparticles as a method for somaclonal variation increasing in flax (L. usitatissimum L.) 

      Kokina, Inese; Jahundoviča, Inese; Mickeviča, Ilona; Jermaļonoka, Marija; Strautiņš, Jānis; Popovs, Sergejs; Ogurcovs, Andrejs; Sledevskis, Eriks; Polyakov, Boriss; Gerbreders, Vjačeslavs (Hindawi Limited, 2017)
      Development of methods for direct delivery of different bioactive substances into the cell is a promising and intensively approached area of research. It has become a subject of serious research for multidisciplinary team ...

    • Doped zirconia phase and luminescence dependence on the nature of charge compensation 

      Smits, Krisjanis; Olsteins, Dags; Zolotarjovs, Aleksejs; Laganovska, Katrina; Millers, Donats; Ignatans, Reinis; Grabis, Janis (Nature Publishing Group, 2017)
      Zirconia is a relatively new material with many promising practical applications in medical imaging, biolabeling, sensors, and other fields. In this study we have investigated lanthanide and niobium doped zirconia by ...

    • Cavity Ring-Down Spectroscopy measurements of Acetone concentration 

      Revalde, G.; Alnis, J.; Blušs, K.; Grundšteins, K.; Nitšs, Edgars (Institute of Physics Publishing, 2017)
      The Cavity Ring-Down Spectroscopy system for medical applications is created and first results for detection of acetone are shown. The acetone concentration was measured in the air. In the system a pulsed 1 kHz 266 nm DPSS ...

    • Certain doping concentrations caused half-metallic graphene 

      Miao, Lu; Jia, Ran; Wang, Yu; Kong, Chui-Peng; Wang, Jian; Eglitis, Roberts I.; Zhang, Hong-Xing (Elsevier B.V., 2017)
      The singly B and N doped graphene systems are carefully studied. The highly concentrated dopants cause a spin polarization effect in the systems. The spin polarization limits are affirmed in the singly B and N doped graphene ...

    • Colorimetric gas detection by the varying thickness of a thin film of ultrasmall PTSA-coated TiO2 nanoparticles on a Si substrate 

      Joost, Urmas; Šutka, Andris; Visnapuu, Meeri; Tamm, Aile; Lembinen, Meeri; Antsov, Mikk; Utt, Kathriin; Smits, Krisjanis; Nõmmiste, Ergo; Kisand, Vambola (Beilstein-Institut Zur Forderung der Chemischen Wissenschaften, 2017)
      Colorimetric gas sensing is demonstrated by thin films based on ultrasmall TiO2 nanoparticles (NPs) on Si substrates. The NPs are bound into the film by p-toluenesulfonic acid (PTSA) and the film is made to absorb volatile ...

    • Changes in structure and conduction type upon addition of Ir to ZnO thin films 

      Zubkins, Martins; Kalendarev, Robert; Gabrusenoks, Jevgenijs; Plaude, A. V.; Zitolo, Andrea; Anspoks, Andris; Pudzs, Kaspars; Vilnis, Kaspars; Azens, Andris; Purans, Juris (Elsevier B.V., 2017)
      Zn-Ir-O (Zn/Ir ≈ 1/1) thin films have been reported to be a potential p-type TCO material. It is, however, unknown whether it is possible to achieve p-type conductivity at low Ir content, and how the type and the magnitude ...

    • Analysis of the U L3-edge X-ray absorption spectra in UO2 using molecular dynamics simulations 

      Bocharov, Dmitry; Chollet, Mélanie; Krack, Matthias; Bertsch, Johannes Johannes; Grolimund, Daniel; Martin, Matthias; Kuzmin, Alexei; Purans, Juris; kotomin, Eugene A. (Elsevier Ltd, 2017)
      Uranium L3-edge X-ray absorption spectroscopy was used to study the atomic structure of uranium dioxide (UO2). The extended X-ray absorption fine structure (EXAFS) was interpreted within the ab initio multiple-scattering ...

    • Determination of Kerr and two-photon absorption coefficients of indandione derivatives 

      Bundulis, Arturs; Mihailovs, Igors; Nitiss, Edgars; Busenbergs, Janis; Rutkis, Martins (SPIE, 2017)
      We studied nonlinear optical properties of two different aminobenziliden-1,3-indandione derivatives - DDMABI and DMABI-OH by employing the Z-scan method. Through this we described how different donor and acceptor groups ...

    • A comparative study of heterostructured CuO/CuWO4 nanowires and thin films 

      Polyakov, Boris; Kuzmin, Alexei; Vlassov, Sergei; Butanovs, Edgars; Zideluns, Janis; Butikova, Jelena; Kalendarev, Robert; Zubkins, Martins (Elsevier B.V., 2017)
      A comparative study of heterostructured CuO/CuWO4 core/shell nanowires and double-layer thin films was performed through X-ray diffraction, confocal micro-Raman spectroscopy and electron (SEM and TEM) microscopies. The ...