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Almeida, A. F. L. et al. Structural properties of CaCu3Ti4O12 (CCTO) obtained by mechanical alloying. In: CONGRESSO BRASILEIRO DE CERÂMICA, 47., 2003, João Pessoa. Anais... João Pessoa, 2003.
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Abstract

Mechanical alloying has been used successfully to produce nanocrystalline powders of CaCu3Ti4O12 (CCTO), for the first time, using two different experimental procedures. The milled CCTO were studied by x-ray powder diffraction, infrared and Raman scattering spectroscopy. After 100 hours of milling the formation of CCTO was confirmed by x-ray powder diffraction in both procedures. The infrared and Raman scattering spectroscopy results suggest that the increase of the milling time lead to the formation of nanocrystalline CCTO, as seen by x-ray diffraction analysis. These materials are attractive for capacitor applications and certainly for microelectronics, microwave devices (cell mobile phones for example), where the decrease of the size of the devices are crucial. This milling process presents the advantage that melting is not necessary and the powder obtained is nanocrystalline with extraordinary mechanical properties. The high efficiency of the process, opens a way to produce commercial amount of nanocrystalline powders.
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