Artículo
Microstructure and impedance spectroscopy of 3YTZP/SWNT ceramic nanocomposites
Autor/es | Poyato Galán, Rosalía
Macías Delgado, Julio Gallardo López, Ángela María Muñoz Bernabé, Antonio Domínguez Rodríguez, Arturo |
Departamento | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2015 |
Fecha de depósito | 2018-04-09 |
Publicado en |
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Resumen | This work provides new insights on microstructure and electrical properties of 3 mol% Y2O3–ZrO2 (3YTZP) composites with 0.5, 1, and 1.5 vol% single walled carbon nanotubes (SWNTs). The composites were spark plasma sintered ... This work provides new insights on microstructure and electrical properties of 3 mol% Y2O3–ZrO2 (3YTZP) composites with 0.5, 1, and 1.5 vol% single walled carbon nanotubes (SWNTs). The composites were spark plasma sintered (SPS) in identical conditions at 1250 °C from powder prepared by two different processing routines, with the aim of optimizing the SWNTs dispersion throughout the ceramic matrix. High densification and submicrometric grain size were achieved in all the composites. Electrical properties of the composites were characterized in a wide temperature range, and modeling of the impedance properties was approached by means of an equivalent circuit that allows separation of the individual SWNT bundles contribution to resistance from the resistance due to junctions between bundles. Effects of the homogeneous distribution of SWNTs at the ceramic grain boundaries on the crystalline phases, percolation threshold, total conductivity and evolution of junctions׳ resistivity with temperature were analyzed and discussed. |
Agencias financiadoras | Ministerio de Ciencia e Innovación (MICIN). España Junta de Andalucía |
Cita | Poyato Galán, R., Macías Delgado, J., Gallardo López, A., Muñoz Bernabé, A. y Domínguez Rodríguez, A. (2015). Microstructure and impedance spectroscopy of 3YTZP/SWNT ceramic nanocomposites. Ceramics International, 41 (1), 12861-12868. |
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