Non-Ohmic and dielectric properties of a Ca2Cu2Ti4O12 polycrystalline system

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Ramirez, M. A.
Bueno, Paulo Roberto [UNESP]
Varela, José Arana [UNESP]
Longo, Elson [UNESP]

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American Institute of Physics (AIP)


An investigation was made into the non-Ohmic and dielectric properties of a Ca2Cu2Ti4O12 perovskite-type system. Compared to the traditional CaCu3Ti4O12-based composition, the imbalance between the Ca and Cu atoms caused the formation of a polycrystalline system presenting similar to 33.3 mol % of CaCu3Ti4O12 (traditional composition) and similar to 66.7 mol % of CaTiO3. As for non-Ohmic properties, the effect of this Ca and Cu atom imbalance was that a nonlinear electric behavior of similar to 1500 was obtained. This high nonlinear electrical behavior emerged in detriment to the ultrahigh dielectric property frequently reported. The high non-Ohmic property was explained by the existence of Schottky-type barriers, whose formation mechanism may be similar to that proposed for traditional metal oxide non-Ohmic devices, according to similarities discussed herein. (c) 2006 American Institute of Physics.



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Applied Physics Letters. Melville: Amer Inst Physics, v. 89, n. 21, 3 p., 2006.