Structural, electrical properties and photoluminescence analyses of the terbium doped barium titanate

被引:9
作者
Cernea, Marin [1 ]
Secu, Mihail [1 ]
Radu, Roxana [1 ]
Ganea, Paul [1 ]
Surdu, Vasile Adrian [2 ]
Trusca, Roxana [2 ]
Vasile, Eugenia Tanasa [2 ]
Secu, Elisabeta Corina [1 ]
机构
[1] Natl Inst Mat Phys, Atomistilor 405A, Magurele 077125, Romania
[2] Univ Politehn Bucuresti, Bucharest 060042, Romania
关键词
Terbium doped barium titanate; Hydrothermal synthesis; Dielectric properties; Photoluminescence; GRAIN-SIZE; DIELECTRIC-PROPERTIES; DOMAIN-STRUCTURE; BATIO3; CERAMICS; MICROWAVE; POLARIZATION; RELAXATION; DEPENDENCE; CRYSTAL;
D O I
10.1016/j.jallcom.2021.160380
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Multifunctional materials integrating optical and electric properties into a composite or into a doped single-phase material have attracted much attention from scientists for future optoelectronic devices. In this work, polycrystalline Ba1-xTbxTiO3, x = 0.00, 0.01 and 0.05 materials were synthesized by hydrothermal route and their photoluminescence and dielectric properties were studied. The as-prepared powders showed a microstructure consisting of grains with the shape of cube; and average particle size ranging from 75 nm to 150 nm. The investigated temperature dependence of dielectric permittivity of Ba1-xTbxTiO3 ceramics revealed a decrease of the Curie temperature (Tc) with increasing terbium content, and a more pronounced degree of diffuseness of phase transition. The resistivity at room temperature was discussed in terms of positive temperature coefficient of resistance (PTRC) effect. UV-vis reflectance spectra of Ba1-xTbxTiO3 samples showed a decrease of the band gap energy with the increase of Tb amount, due to the band-gap narrowing effect. The photoluminescence spectra recorded for Tb doped BaTiO3 materials, at 80 K, evidenced the typical f-f luminescence lines of the Tb3+ accompanied the broad luminescence band at about 425 nm due to self-trapped exciton recombination. These results demonstrated that the terbium enhances the dielectric properties and photoluminescence simultaneously, being suitable for electronic applications. (C) 2021 Elsevier B.V. All rights reserved.
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页数:10
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