Caracterización de las propiedades eléctricas locales del CaCu3 Ti4 O12.

Zarel Valdez Nava (1) , Chafé Cheballah (2) , Lionel Laudebat (3) , Thierry Lebey (1) , Sophie Guillemet (4)

1 LAPLACE-MDCE - Matériaux Diélectriques dans la Conversion d’Energie
2 LAPLACE - LAboratoire PLasma et Conversion d'Energie
3 INUC - Institut national universitaire Champollion [Albi]
4 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

CaCu3Ti4O12 (CCTO) is a material that presents a colossal dielectric constant (>105). In this work, CCTO was synthesized by chemical coprecipitation and sintered at 1050°C. Electrical properties were studied in bulk ceramic materials, as well as on individual grains and trough grain boundaries in alternative regime and continuous current. In AC regime, grains and grain boundaries show a resistive-like behavior. In DC regime local grain and grain boundary measurements do not allow determining the origin of the non-symmetric response in the bulk samples. It is finally found that non-ohmic contact between the heterogeneous ceramic and the electrodes could explain both the bulk and local electrical behaviors.

Mots clés: Colosal dielectric constant; CCTO; Local electrical characterization; Colosal dielectric constant

Domaines: Matériaux

Zarel Valdez Nava, Chafé Cheballah, Lionel Laudebat, Thierry Lebey, Sophie Guillemet. Caracterización de las propiedades eléctricas locales del CaCu3 Ti4 O12.. Ingenierías, 2012, 15 (57), pp.12-18. ⟨hal-03526711⟩