Bueno, Paulo Roberto [UNESP]Ramirez, M. A.Varela, José Arana [UNESP]Longo, Elson [UNESP]2014-05-202014-05-202006-11-06Applied Physics Letters. Melville: Amer Inst Physics, v. 89, n. 19, 3 p., 2006.0003-6951http://hdl.handle.net/11449/32302Dielectric spectroscopy was used in this study to examine CaCu3Ti4O12 polycrystalline samples. The analysis involved systems presenting low non-Ohmic properties, and the grain's internal domain was evaluated separately from the contribution of barrier-layer capacitances associated with Schottky-type barriers in this type of material. The effect of oxygen-rich atmosphere and high cooling rate was evaluated, revealing a strong increase in the dielectric properties of the CaCu3Ti4O12 system under these conditions. This effect was attributed to a chemical change in the grain's internal domain, which may be considered an internal barrier-layer capacitance of the polycrystalline material. (c) 2006 American Institute of Physics.3engArtigo10.1063/1.2386916WOS:000241960400017Acesso abertoWOS000241960400017.pdf04770459067332540000-0003-2827-0208