Abstract
Two colossal dielectric permittivity (CDC) materials, CaCu3Ti4O12 (CCTO) issued from conventional sintering with grain sizes between 20 and 30 µm and SPS sintered La0.05Ba0.95TiO3−δ (BTL-SPS) with grain sizes between 50 and 100 nm, are characterized by simple electrical measurements (Sawyer–Tower and I(V)). Whatever the type of measurements performed, the results depend, on the one hand, on the relative position of the sample in the measuring setup and, on the other hand, on the type of surface treatment achieved on the sample. A clear demonstration of the non-isotropic character of the materials under study is achieved. The non-symmetrical electrical response observed in these two different materials seems to be independent of microstructure and composition, and could be related to the overall phenomena at the origin of the colossal values of permittivity.
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