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      • KCI등재

        Structural and optical characterization of solegel derived Tm-doped BaTiO3 nanopowders and ceramics

        Marin Cernea,Corina Elisabeta Secu,Bogdan Stefan Vasile,Mihail Secu 한국물리학회 2013 Current Applied Physics Vol.13 No.1

        Nanocrystalline Tm3þ(5%)-doped BaTiO3 (BT-Tm) has been synthesized by the solegel method. The morphology, structure, and optical properties of powders and ceramics were characterized. The average grain size of the gel precursor annealed at 700 and 900 ℃ was 20 nm and 30 nm, respectively. These powders were single phase and crystallized with a cubic structure while the BT-Tm sintered ceramics were crystallized with the tetragonal BaTiO3 structure. The photoluminescence spectra showed typical transitions of Tm3þ ions and a structure consistent with the Tm3þ ions incorporation in the BaTiO3 crystalline lattice. Thermoluminescence peaks recorded at 300 ℃ (for annealed samples) or at 230 ℃ for the ceramic sample were assigned to the recombination of the Tm2þ-electron traps located mainly at the surface of the nano-crystals or inside the microcrystals, respectively.

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