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    Wyświetlanie 1-11 z 11
    Tytuł:
    Sorption and migration of Cs, Sr, and Eu in gypsum - groundwater system
    Autorzy:
    Alhassanieh, O.
    Mrad, O.
    Ajji, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/147892.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    distribution
    cesium
    europium
    strontium
    gypsum
    groundwater
    Opis:
    The distribution of 137Cs, 152Eu, and 85Sr in a solid/aqueous system, gypsum in contact with groundwater, was investigated using gamma-spectrometry. The sorption and migration of the radionuclides were investigated. The aqueous phase was characterized using instrumental neutron activation analysis (INAA) and high performance liquid chromatography (HPLC). The solid phases were characterized using X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The investigations included three kinds of gypsum: mineral, commercial, and own prepared gypsum. The influence of some parameters on sorption/migration of the radionuclides were studied, such as contact time, pH, and concentrations of concurrent elements. The effect of element concentration was also investigated. The results show the ability of gypsum to keep Sr and Eu in the solid phase in all three cases. The incorporation of Cs in the solid phase depends on the conditions and used materials, and varies between 93 and 97%.
    Źródło:
    Nukleonika; 2012, 57, 1; 125-131
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of Thermal Properties of Type Eu2O3-ZrO2 Sinters
    Autorzy:
    Jucha, S.
    Moskal, G.
    Mikuśkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352258.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pyrochlores
    europium zirconates
    thermal diffusivity
    TBC
    Opis:
    The oxides with pyrochlore or defected fluorite structure are a potential alternative ceramic materials for now widely used yttria-stabilized zirconia 8YSZ in the application for the insulation layer of thermal barrier coatings systems. This paper presents a procedure of synthesis of europium zirconate of Eu2Zr2O7 type, by the method of high temperature sintering under pressure. The analysis of the effect of the powders` homogenization methods on homogeneity of final sintered material showed that the highest homogeneity can be obtained after mechanical mixing in alcohol. Moreover, the DSC investigation carried out on a mixture of powders before the sintering process and on the material after high temperature sintering under pressure, suggest the synthesis of a new phase an europium zirconate Eu2Zr2O7 with the pyrochlore structure. Obtained phase was characterized by stability over the entire range of tested temperature, i.e. to 1450°C. The resulting material based on europium zirconate has a lower coefficient of thermal diffusivity than the now widely used 8YSZ.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1121-1128
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Thermal Properties of Europium-Cerium Oxide as a New Fluorite-Type Ceramic Material for Thermal Barrier Coatings Applications
    Autorzy:
    Mikuśkiewicz, M.
    Stopyra, M.
    Moskal, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/352272.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    TBC
    cerium oxide
    europium oxide
    thermal properties
    Opis:
    In the present paper the structure and thermal properties of europium cerium oxides were investigated. The material for the research was obtained via solid state synthesis. The initial powders: ceria CeO2 and europia Eu2O3 were mixed in 1:1 mass ratio (non-stoichiometric proportion with the excess of CeO2) and milled. The sintering process was performed using high temperature vacuum press at 1350°C. Calorimetric analysis was conducted both for initial powders and milled mixture. The structure, phase composition and thermal diffusivity of obtained material were investigated in as-sintered condition. It was revealed that the obtained material was multi-phase. Non-stoichiometric phases including Ce0.5Eu0.5O1.75 with fluorite type structure and different lattice parameters were present. Thermal diffusivity decreased in the range from 25 to 900°C from 1.49 to 0.57 mm2 /s and then increased to 0.70 mm2 /s at 1400°C.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 2089-2093
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solid State Synthesis of Europium Zirconate Based Material
    Autorzy:
    Mikuśkiewicz, M.
    Moskal, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/353816.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    europium zirconates
    solid-state synthesis
    pyrochlores
    TBC
    Opis:
    In the article, the characterization of the microstructure, phase composition and distribution of elements in the Eu2 O3 -ZrO2 sintered materials obtained by four different ways of powders’ homogenization (mixing) process and different temperature of sintering process is shown. The feedstock powders with an average mole ratio of ZrO2 to Eu2 O3 equal 74% to 26% were used as an initial material. The principal aim of the investigation was characterization of differences in the microstructure of the same type of ceramics, however, prepared via different mixing and manufacturing processes. The range of the investigation covered a characterization of these materials via phase identification of all samples by XRD (X-ray diffraction) and characterization of internal morphology of the specimens with detailed analysis of elements distributions by SEM (scanning electron microscopy) and EDS (energy dispersive spectrometry). The aim of the following investigation is to characterize the possibilities of the solid state synthesis of the europium zirconate based materials, dedicated for TBC applications.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1343-1352
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of strontium, europium and americium(III) ions on a novel adsorbent Apatite II
    Autorzy:
    Krejzler, J.
    Narbutt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148382.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    adsorption
    americium
    Apatite II
    europium
    hydroxyapatite
    nuclear waste
    strontium
    Opis:
    A novel material, Apatite II, obtained from a natural source, has been determined to be a good adsorbent for radionuclides of strontium, europium and trivalent actinides, but not caesium, from neutral aqueous solutions containing common chelating agents and inorganic salts at moderate concentrations. This inexpensive, easily available material seems to be a promising backfill for engineered barriers in nuclear waste repositories. However, encapsulation of the sorbent grains loaded with radiostrontium in the Portland cement matrix results in undesirably high leaching rate for this particular radionuclide.
    Źródło:
    Nukleonika; 2003, 48, 4; 171-175
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Recovery of Yttrium and Europium Compounds from Waste Materials
    Odzysk związków itru i europu z surowców odpadowych
    Autorzy:
    Góralczyk, S.
    Uzunow, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/204909.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    recovery
    yttrium
    europium
    waste materials
    odzysk
    ITR
    europ
    odpady
    Opis:
    Rare earth metals including yttrium and europium are one of several critical raw materials, the use of which ensures the development of the so-called high technology. The possibility of their recovery in Europe is limited practically only to secondary materials such as phosphogypsum and electronic waste. The article presents the results of our research concerning the development of recovery technology of yttrium and europium from luminophore CRT used lamps. It describes the principle of separation of elements and the test results of cleaning the concentrate. It was shown that the costs of preparing the concentrate according to the proposed technology are lower than the phosphogypsum processing technology and the composition of the resulting product does not contain hazardous substances.
    Metale ziem rzadkich, w tym itr i europ należą do tej grupy kilkunastu surowców krytycznych, których stosowanie zapewnia rozwój w obszarze tzw. wysokich technologii. Możliwość ich pozyskiwania w Europie ogranicza się praktycznie do surowców wtórnych, np. fosfogipsów oraz zużytego sprzętu elektronicznego. W artykule przedstawiono wyniki badań autorów dot. opracowania technologii odzysku itru i europu z luminoforu zużytych lamp kineskopowych. Opisano zasady wydzielania pierwiastków i wyniki badań oczyszczania koncentratu. Wykazano, że koszty otrzymywania koncentratu wg proponowanej technologii są niższe od technologii przeróbki fosfogipsów, a otrzymany produkt nie zawiera substancji niebezpiecznych.
    Źródło:
    Archives of Environmental Protection; 2013, 39, 3; 107-114
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of fluoride nanocrystals and their spectroscopic properties
    Autorzy:
    Pawlik, N.
    Szpikowska-Sroka, B.
    Goryczka, T.
    Pisarski, W. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/173278.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sol-gel method
    glass-ceramics
    fluoride nanocrystals
    europium ions
    Opis:
    In this work, the fabrication of glass-ceramic materials containing MF3:Eu3++ (M = La, Gd) nanocrystals dispersed in silica sol-gel hosts has been presented. The transformation from liquid sols towards bulk samples was also examined based on IR measurements. The crystallization temperatures and formation of MF3 phases were verified based on TG/DSC analysis and XRD measurements. The optical properties of prepared Eu3+5D05D0 → 7FJ (J = 1–4) emission bands, which were recorded within the reddish-orange spectral area under near-UV illumination (λexc = 393 nm). Recorded luminescence spectra and double-exponential character of decay curves for prepared glass-ceramic samples indicated the successful migration of Eu3+ dopant ions from amorphous silica framework to low-phonon energy MF3 nanocrystal phases.
    Źródło:
    Optica Applicata; 2019, 49, 3; 415-426
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Migration of strontium, cesium, europium and uranium from poly(methyl styrene)- and polystyrene - phosphate composites prepared using gamma radiation
    Autorzy:
    Alhassanieh, O.
    Ajji, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/146616.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    poly(methyl styrene)
    polystyrene
    composites
    distribution
    radionuclide
    europium
    strontium
    cesium
    uranium
    Opis:
    Composites consisting of natural phosphate powder and two monomers (styrene or methyl styrene) have been prepared by means of gamma irradiation. The polymerization reaction was followed up using a thermogravimetric analyzer (TGA) to determine the conversion of the polymerization. Differential scanning calorimeter (DSC) was used to locate and determine the glass transition temperature (Tg) of the prepared samples. The distribution of 137Cs, 152Eu, 85Sr and 238U in a solid-aqueous system, composites of phosphate-poly(methyl styrene) and of phosphate-polystyrene in contact with groundwater, was investigated using alfa-spectrometry and fluorometry. The effects of contact time, pH, and the concentration of concurrent element (Ca) were studied. The results were compared with earlier results with phosphate alone in the solid phase. The ability of the produced composites to keep the studied radioisotopes in the solid phase is much higher than in the mineral phosphate. This improvement is more remarkable for strontium and cesium than for europium and uranium, due to their high element ratio in the solid phase in phosphate experiments.
    Źródło:
    Nukleonika; 2012, 57, 3; 369-374
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of gadolinium and europium concentrations as contaminant tracers in the Nida River watershed in south-central Poland
    Autorzy:
    Migaszewski, Z. M.
    Gałuszka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060198.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    are earth elements
    wastewater effluent
    Nida River drainage system
    anthropogenic gadolinium
    geogenic europium
    Opis:
    This paper presents the results of rare earth element (REE) determinations in the Nowiny wastewater treatment plant (NWWTP) effluents and Nida River system waters of the southeastern Kielce Region (south-central Poland). Of the REE examined, gadolinium and europium turned out to be very useful for pinpointing anthropogenic and geogenic sources. Anthropogenic gadolinium (Gdanth), used as a contrasting agent in magnetic resonance imaging (MRI), is released from the NWWTP into the river drainage system. This micropollutant is traced downstream over the distance of about 15 km. This river stretch is characterized by a strong positive NASC-normalized Gdanth anomaly with the GdNASC/GdNASC* ratio above 1.1 (1.80–15.57) and the Gdanth input varying from 44 to 94%. Two additional positive Gdanth anomalies recorded in the rivers Bobrza and Nida point out to mixing of effluents derived from the NWWTP and other local wastewater treatment plants. In contrast, the Gdanth-uncontaminated waters upstream, or downstream far away from the NWWTP display a distinct positive NASC-normalized Eu anomaly highlighted by a high Eu/Eu* ratio in the range of 2.87 to 29.70. The lack of Gdanth anomaly upstream from the NWWTP also indicates that there is no leakage of municipal sewage from the sanitary collector sewer into the Silnica River. Thus Gd as a contaminant may be effectively used as a tracer in similar pollution studies because it is relatively simple and cost-effective to discriminate between contaminant concentrations and normal background concentrations.
    Źródło:
    Geological Quarterly; 2016, 60, 1; 67--76
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of metal surfaces coated with europium-doped titanium dioxide by laser induced breakdown spectroscopy
    Autorzy:
    Głogocka, D.
    Noculak, A.
    Pucińska, J.
    Jopek, W.
    Podbielska, H.
    Langner, M.
    Przybyło, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/306866.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    europ
    tytan
    LIBS
    jakość
    kompozycja
    cienkie warstwy
    europium
    titanum
    quality
    composition
    thin layers
    Opis:
    The surface passivation with titanium sol-gel coatings is a frequently used technique to control the adsorption of selected biological macromolecules and to reduce the exposure of the bulk material to biological matter. Due to the increasing number of new coating-preparation methods and new gel compositions with various types of additives, the quality and homogeneity determination of the surface covering is a critical factor affecting performance of any implanted material. While coating thickness is easy to determine, the homogeneity of the surface distribution of coating materials requires more elaborate methodologies. In the paper, the laser induced breakdown spectroscopy (LIBS) based method, capable to quantitate the homogeneity and uniformity of the europium in titanium dioxide sol-gel coatings on stainless steel surfaces prepared with two different procedures: spin-coating and dip-coating, is presented. The emission intensity of titanium has been used to determine the coating thickness whereas the relative values of europium and titanium emission intensities provide data on the coating homogeneity. The obtained results show that the spin-coating technique provides better surface coverage with titanium dioxide. However, when the surface coating compositions were compared the dip-coating technique was more reliable.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 3; 33-40
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescencyjne sensory tlenu, ciśnienia i temperatury
    Oxygen, pressure and temperature luminescent sensors
    Autorzy:
    Tsvirko, M.
    Kalota, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/171947.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    luminescencja
    metaloporfiryny
    kompleksy europu
    sensory tlenu
    sensory ciśnienia
    sensory temperatury
    luminescence
    metalloporphyrins
    europium complexes
    oxygen sensors
    pressure sensors
    temperature sensors
    Opis:
    Optical chemical sensors enlarge the definition of a classical chemical sensor; they present results in two-dimensional (2D) or three-dimensional (3D) aspect. They can determine parameters of micro and macro scale objects without using a lot of electronic equipment. This article is focused on sensors based on porphyrin derivatives and europium complexes, being the most frequently used substances sensitive to oxygen concentration, pressure and temperature changes. Along with the presentation of characteristics of substances employed to sensors’ construction, also the general principle of luminescent sensors operation, composition and operation range of selected mono- and bifunctional luminescent sensors are described; moreover the selected achievements, such as the “traffic light” sensor are shown.
    Źródło:
    Wiadomości Chemiczne; 2011, 65, 11-12; 1069-1097
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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