A polaronic stacking fault defect model for CaCu3Ti4O12 material: an approach for the origin of the huge dielectric constant and semiconducting coexistent features

Authors
Bueno, Paulo R.; Tararan, Ronald; Parra, Rodrigo; Joanni, Ednan; Ramírez, Miguel A.; Ribeiro, Willian C.; Longo, Elson; Varela, José A.
Publication Year
2009
Language
English
Format
article
Status
Published version
Description
This paper proposes a polaronic stacking fault defect model as the origin of the huge dielectric properties in CaCu3Ti4O12 (CCTO) materials. The model reconciles the opposing views of researchers on both sides of the intrinsic versus extrinsic debate about the origin of the unusually high values of the dielectric constant measured for CCTO in its various forms. Therefore, by considering stacking fault as the origin of the high dielectric constant phenomena, it was shown that the internal barrier layer capacitance mechanism is enhanced by another similar, but different in nature, mechanism that operates in the nanoscale range due to polaron defects associated with stacking fault, a mechanism that was referred to as nanoscale barrier layer capacitance (NBLC). The NBLC approach explains the origin of the CCTO´s huge dielectric constant coexisting with semiconducting features.
Fil: Bueno, Paulo R.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
Fil: Tararan, Ronald. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
Fil: Parra, Rodrigo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Joanni, Ednan. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
Fil: Ramírez, Miguel A.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
Fil: Ribeiro, Willian C.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
Fil: Longo, Elson. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
Fil: Varela, José A.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
Subject
CaCu3Ti4O12
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/66566