Moura, F.Simões, A. Z. [UNESP]Deus, R. C. [UNESP]Silva, M. R.Varela, José Arana [UNESP]Longo, Elson [UNESP]2014-05-272014-05-272013-05-01Ceramics International, v. 39, n. 4, p. 3499-3506, 2013.0272-8842http://hdl.handle.net/11449/75204A 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.3499-3506engA. CeramicsB. Chemical synthesesB. Powder metallurgyC. X-ray diffractionCalcium copper titanatesChemical synthesisCubic structureFourier transform infraredFourier transform RamanFT-RamanIntermediate energiesPhoto-luminescent propertiesPhotoluminescence emissionPhotoluminescence measurementsPL emissionPrecursor powderRoom temperatureSoft chemical methodSpectroscopy measurementsUv/vis absorptionsXRD analysisCalcinationPhotoluminescencePowder metallurgyThermogravimetric analysisX ray diffractionPowdersArtigo10.1016/j.ceramint.2012.11.034WOS:000318129100003Acesso restrito2-s2.0-848746680013573363486614904