Study of the Influence of Eu3+ Ions in the Bandgap of K2NdNb5O15 Nanopowders

Eliane Ayumi Namikuchi; Ana Maria Pires; Marcos Augusto Lima Nobre; Silvania Lanfredi

doi:10.4028/www.scientific.net/MSF.820.378

Paper Titles

PP/EPDM Blends Compatibilized by Organically Modified Clays
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Selective Occupancy of Sites by Rare Earths in K₂Nd_(1-X)Eu_xNb₅O₁₅ Nanopowders, where X = 0, 0.0025, 0.025, 0.05 and 0.1, Prepared by Modified Polyol Method
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Changing of the Spontaneous Polarization in Niobate Nanoparticles Induced by Non Isovalent Doping
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Particle Size Analysis of Fe₃O₄ Nanoparticles Coated by Polyethyleneglycol
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Study of the Influence of Eu³⁺ Ions in the Bandgap of K₂NdNb₅O₁₅ Nanopowders
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HomeMaterials Science ForumMaterials Science Forum Vol. 820Study of the Influence of Eu3+ Ions in the Bandgap...

Study of the Influence of Eu³⁺ Ions in the Bandgap of K₂NdNb₅O₁₅ Nanopowders

Abstract:

Ferroelectric semiconductors oxides with tetragonal tungsten bronze TTB-type structure doped with rare earth ions have been investigated in recent years due their promising optical properties. K₂Nd_(1-x)Eu_xNb₅O₁₅nanopowders, where x = 0, 0.0025, 0.025, 0.05 and 0.1 were synthesized by the modified polyol method and characterized by X-ray diffraction and diffuse reflectance spectroscopy UV-Vis. Single phase and crystalline powders of tetragonal symmetry with non-centrosymmetric space group P4bm were obtained. The diffuse reflectance spectra were similar to the profile of a semiconductor material with the presence of thin transitions of Eu³⁺ in europium-doped K₂NdNb₅O₁₅, as well as the transitions of Nd³⁺. The method of Kubelka-Munk was used for the estimation of bandgap energy. The values around 3.7 eV showed small variation with the concentration of Eu³⁺ ions in the K₂NdNb₅O₁₅ host structure. The transitions were identified as direct ones type.

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Materials Science Forum (Volume 820)

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378-383

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https://doi.org/10.4028/www.scientific.net/MSF.820.378

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Online since:

June 2015

Authors:

Eliane Ayumi Namikuchi*, Ana Maria Pires, Marcos Augusto Lima Nobre, Silvania Lanfredi

Keywords:

Niobate, Optical Gap, Semiconductor

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