Просмотр Zinātniskie raksti (CFI) / Scientific articles по автору "Ignatans, Reinis"
Отображаемые элементы 1-7 из 7
-
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. ... -
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 ... -
Electron paramagnetic resonance and photoluminescence investigation of europium local structure in oxyfluoride glass ceramics containing SrF2 nanocrystals
Antuzevics, Andris; Kemere, Meldra; Krieke, Guna; Ignatans, Reinis (Elsevier B.V., 2017)Different compositions of europium doped aluminosilicate oxyfluoride glass ceramics prepared in air atmosphere have been studied by electron paramagnetic resonance (EPR) and optical spectroscopy methods. X-ray diffraction ... -
Local structural investigation of hafnia-zirconia polymorphs in powders and thin films by X-ray absorption spectroscopy
Schenk, Tony; Anspoks, Andris; Jonane, Inga; Ignatans, Reinis; Johnson, Brienne S.; Jones, Jacob L.; Tallarida, Massimo; Marini, Carlo; Simonelli, Laura; Hönicke, Philipp; Richter, Claudia; Mikolajic, Thomas; Schroeder, Uwe (Elsevier Ltd., 2019)Despite increasing attention for the recently found ferro- and antiferroelectric properties, the polymorphism in hafnia- and zirconia-based thin films is still not sufficiently understood. In the present work, we show that ... -
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 ... -
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 ... -
Polarization and acoustic properties of barium-modified lead-free potassium–sodium niobate ceramics
Bormanis, Karlis; Burkhanov, Anver I.; Sternberg, Andris; Zhirkov, Aleksandr V.; Antonova, Maija; Kalvane, Anna; Ignatans, Reinis (Estonian Academy Publishers, 2017)Results of polarization and polarization switching in samples prepared by solid phase synthesis of the (1-х)(K0.5Na0.5)(Nb0.93Sb0.07)O3–xBaTiO3 + 0.5mol%MnO2 system at x = 0.01, 0.02, and 0.04 (KNNS7–xBT) studied over a ...