Publicação: Intense photoluminescence emission at room temperature in calcium copper titanate powders
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Data
2013-05-01
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Coorientador
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Resumo
A study was undertaken about the structural and photoluminescent properties at room temperature of CaCu3Ti4O12 (CCTO) powders synthesized by a soft chemical method and heat treated between 300 and 800 °C. The decomposition of precursor powder was followed by thermogravimetric analysis (TG-DTA), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Fourier transform Raman (FT-Raman) and photoluminescence (PL) measurements. XRD analyses revealed that the powders annealed at 800 °C are becoming ordered and crystallize in the cubic structure. The most intense PL emission was obtained for the sample calcined at 700 °C, which is not highly disordered (300-500 °C) and neither completely ordered (800 °C). From the spectrum it is clearly visible that the lowest wavelength peak is placed around 480 nm and the highest wavelength peak at about 590 nm. The UV/vis absorption spectroscopy measurements showed the presence of intermediate energy levels in the band gap of structurally disordered powders. © 2012 Elsevier Ltd and Techna Group S.r.l.
Descrição
Palavras-chave
A. Ceramics, B. Chemical syntheses, B. Powder metallurgy, C. X-ray diffraction, Calcium copper titanates, Chemical synthesis, Cubic structure, Fourier transform infrared, Fourier transform Raman, FT-Raman, Intermediate energies, Photo-luminescent properties, Photoluminescence emission, Photoluminescence measurements, PL emission, Precursor powder, Room temperature, Soft chemical method, Spectroscopy measurements, Uv/vis absorptions, XRD analysis, Calcination, Photoluminescence, Powder metallurgy, Thermogravimetric analysis, X ray diffraction, Powders
Idioma
Inglês
Como citar
Ceramics International, v. 39, n. 4, p. 3499-3506, 2013.
