Back to Search
Start Over
Electrical and photoluminescence properties of Sm3+ doped Na0.5La0.5Bi8-xSmxTi7O27 ceramics.
- Source :
-
Ceramics International . Feb2018, Vol. 44 Issue 2, p1448-1454. 7p. - Publication Year :
- 2018
-
Abstract
- In this study, Sm 3+ doped Na 0.5 La 0.5 Bi 8- x Sm x Ti 7 O 27 (NBT-BITL- x Sm, x = 0, 0.01, 0.015, 0.02, and 0.03) ceramics were synthesized via a conventional solid-state reaction process. The structural, electrical, and photoluminescence properties of NBT-BITL- x Sm ceramics were systematically investigated. The crystal structure of NBT-BITL- x Sm was refined using XRD Rietveld refinement and found to possess a single orthorhombic structure at room temperature. Raman spectroscopy revealed that Sm 3+ ions preferred to substitute for Bi 3+ located in the A-sites of pseudo-perovskite layers, inducing a slight decrease in orthorhombic distortion. Strong characteristic emission peaks of Sm 3+ ions were observed in orange-red regions under a 407 nm laser source, and the sample with x = 0.015 achieved the optimal photoluminescent property. Dielectric measurements showed double anomaly permittivity peaks at the temperature of 589 and 600 ∘ C ( T m and T c , respectively). The complex impedance spectrum indicated that the electrical conductivities mainly originated from crystal grains at high temperature. The activation energy was calculated to be 1.37–1.44 e V from Arrhenius fitting results. After Sm 3+ substitution, the activation energy for conductivity was increased as a result of reduced oxygen vacancies. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 44
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 126393366
- Full Text :
- https://doi.org/10.1016/j.ceramint.2017.10.030