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LaYO_{3}:Sm^{3+} Nanocrystalline Phosphor: Preparation and Emission Properties

100%
Đorđević V., Nikolić M., Antić Ž., Mitrić M., Dramićanin M.
Acta Physica Polonica A
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2011
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vol. 120
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issue 2
303-305
EN
Samarium doped LaYO_{3} nanocrystalline phosphor powders are obtained by polymer complex solution method. Stoichiometric quantities of La_{2}O_{3}, Y_{2}O_{3} and for dopant ions Sm_{2}O_{3} were dissolved in hot nitric acid. Polyethylene glycol was added in solutions in 1:1 mass ratio to corresponding metal nitrates to form gel. The gel is combusted and annealed at 800°C for two hours to form nanopowder samples. Crystalline structure and phase purity is checked by X-ray diffraction and show that this material is synthesized in cubic bixbyite type structure for the first time. Luminescence properties of Sm^{3+} doped LaYO_{3} exhibited characteristic orange-red emission coming from the intra-4f-shell ^{4}G_{5/2}→^{6}H_{J} electron transitions with emission decay of 1.5 ms. Energy level positions are derived from emission and excitation spectra.
2
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Electrochemical Behaviour of V_{2}O_{5} Xerogel and V_{2}O_{5} Xerogel/C Composite in an Aqueous LiNO_{3} and Mg(NO_{3})_{2} Solutions

100%
Stojković I., Cvjetićanin N., Marković S., Mitrić M., Mentus S.
Acta Physica Polonica A
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2010
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vol. 117
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issue 5
837-840
EN
We synthesized both the V_{2}O_{5} xerogel and the composite V_{2}O_{5} xerogel/C starting from the solution of V_{2}O_{5} in hydrogen peroxide. After the characterization by XRD, thermal (TGA-DTA), SEM methods and by particle size analysis, the investigation of Li^{+} and Mg^{2+} intercalation/deintercalation reactions in an aqueous solutions of LiNO_{3} and Mg(NO_{3})_{2} were performed by cyclic voltammetry. The composite material V_{2}O_{5} xerogel/C displayed relatively high intercalation capacity, amounting to 123 mA h g^{-1} and 107 mA h g^{-1}, in lithium and magnesium salt solutions, respectively.
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Structural and Electrical Properties of Sintered Barium-Zinc-Titanate Ceramics

86%
Obradović N., Filipović S., Pavlović V., Paunović V., Mitrić M., Ristić M.
Acta Physica Polonica A
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2011
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vol. 120
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issue 2
322-325
EN
The aim of this work was an investigation of structural and electrical properties of sintered barium-zinc-titanate ceramics. Mixtures of BaCO_{3}, ZnO and TiO_{2} were mechanically activated in a planetary ball mill up to 80 minutes and sintered isothermally in air for 120 minutes at 1300°C. The phase composition in the BaCO_{3}-ZnO-TiO_{2} system after milling and sintering was analyzed using the XRD method. The existence of pure barium-zinc-titanate has been registered. Microstructure analyses were performed using SEM. The results of electric resistivity, capacitance and loss tangent of the sintered samples were correlated with the XRD and SEM results.
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