Dielectric response and relaxation phenomena in composites of epoxy resin with BaTiO3 particles

Ramajo, Leandro Alfredo; Reboredo, María Marta; Castro, Miriam Susana

doi:10.1016/j.compositesa.2005.01.026

Cited by 139 publications

(105 citation statements)

References 8 publications

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“…Besides, the real permittivity increased as the temperature did (Figure 3) due to the higher mobility of polymer chains. Moreover, it was observed that imaginary permittivity decreased at low frequencies (Figure 3b), because of a relaxation process [7][8] . Changes in the permittivity values as a function of frequency are attributed to dielectric relaxations.…”

Section: Resultsmentioning

confidence: 99%

“…The real permittivity of CCTO systems was higher than BaTiO 3 composites, throughout the volume fraction range. Nevertheless, considering that dielectric permittivity of CCTO is 9000 ε 0 10 against 2500 ε 0 of BaTiO 3 7 , composites permittivities did not show great differences at the same volume fraction due to the resin influence (4.5ε 0 ) on the composite permittivity 7 . Moreover, heterogeneous particle distribution could have affected composite permittivity values.…”

Section: Resultsmentioning

confidence: 99%

“…In Figure 5 the experimental data of real permittivity values at 30 °C and 2500 Hz, as a function of the filler volume fraction, are plotted. From the fitting, it was obtained that real permittivity of BaTiO 3 , CCTO, and the pure resin were of 2280, 9000, and 4.5, respectively 7,10 . log(ε c ) = V m .log(ε m )+(0.7).V f .log(ε f ) It can be seen that the real permittivity of both systems is appropriately fitted by the model.…”

Section: Resultsmentioning

confidence: 99%

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Dielectric behaviour of CaCu3Ti4O12-epoxy composites

et al. 2008

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The dielectric behavior of composite materials (epoxy resin -barium titanate and epoxy -CCTO) was analysed as a function of ceramic amount. Composites were prepared by mixing the components and pouring them into suitable moulds. In some compositions, the matrix was reduced by tetrahydrofuran (THF) incorporation. Samples containing various amounts of ceramic filler were examined by TG/DTA and scanning electron microscopy analysis. Dielectric measurements were performed from 20 Hz to 1 MHz and 30 to 120 °C. It was demonstrated that the epoxy -CCTO composites possessed higher permittivity than classic epoxy -BaTiO 3 composites. However, the low resin permittivity prevailed in the composite dielectric performance.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Dielectric behaviour of CaCu3Ti4O12-epoxy composites

et al. 2008

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“…As pointed out in a recent review [33], modification of the surface of the ceramic fillers, through chemical grafting or the production of core-shell structures is key to improve filler dispersion, reduce porosity, thereby improving the mechanical, and electrical properties of the composites. Most of the existent studies focus on the dielectric [34][35][36][37][38][39][40][41][42][43] and electromechanical [4,7,13,15,17,25,44] properties of such composites and relatively few systematic studies on their thermal and mechanical behavior have been published so far. Furthermore the ceramic volume fractions considered are often much lower than those used in most applications [45], studies of highly filled composites mainly being limited to lead-based ferroelectric materials [46,47].…”

Section: Introductionmentioning

confidence: 99%

The effect of processing conditions on the morphology, thermomechanical, dielectric, and piezoelectric properties of P(VDF-TrFE)/BaTiO3 composites

et al. 2012

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In this study (0-3) P(VDF-TrFE)/BaTiO 3 composites containing up to 60 vol% of ceramic phase were prepared by solvent casting or compression molding. Their thermomechanical, dielectric, and piezoelectric properties were investigated, and discussed in the light of the properties of the basic components, the processing route and the resulting morphology. The crystalline structure of the P(VDF-TrFE) matrix was found to be highly dependent on the processing route, while the structure of BaTiO 3 was not affected by any of the processing steps. The mechanical properties of the solvent cast materials showed a maximum at 30 vol% BaTiO 3 , while they increased monotonically with BaTiO 3 content for compression molded materials. This difference was attributed to a higher amount of porosity and inhomogeneities in the solvent cast composites. Permittivity as high as 120 and piezoelectric coefficient d 33 up to 32 pC/N were obtained for compression molded composites, and the observed decrease in d 33 with aging time was attributed to the effect of mechanical stress release in the polymer matrix.

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“…Cabe destacar que los resultados que se presentan en esta sección para los sistemas BaTiO 3 /epoxi y Fe 3 O 4 /epoxi fueron reportados con anterioridad por Ramajo y colaboradores [11][12] y se exponen sólo con el objetivo de mejorar la calidad del análisis. En la tabla se evidencia, que la densidad del material aumenta al incrementarse el porcentaje de carga.…”

Section: Compuestos Bifásicos Batio 3 /Epoxi Y Fe 3 O 4 /Epoxiunclassified

Microestructura y propiedades de compuestos de Fe3O4/BaTiO3/epoxi

et al. 2010

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RESUMENCon el objetivo de estudiar nuevos materiales multipropósito, en este trabajo se analizó la influencia de las partículas de Fe 3 O 4 y BaTiO 3 sobre las propiedades magnéticas y dieléctricas de los sistemas Fe 3 O4/BaTiO 3 /epoxi. A tal efecto se analizaron los sistemas bifásicos Fe 3 O 4 /epoxi y BaTiO 3 /epoxi y a partir del análisis de los resultados se conformaron los compuestos Fe 3 O 4 /BaTiO 3 /epoxi. En todos los casos los valores de permitividad y pérdidas dieléctricas fueron altamente influenciados por el contenido de carga. En este sentido, los materiales procesados con Fe 3 O 4 presentaron muy elevadas pérdidas dieléctricas para altas concentraciones de carga debido a efectos de percolación y a las propiedades semiconductoras del Fe 3 O 4 .Palabras claves: Materiales compuestos, propiedades dieléctricas y magnéticas. Microstructure and properties of Fe 3 O 4 /BaTiO 3 /epoxy composites ABSTRACTThe influence of Fe 3 O 4 and BaTiO 3 on dielectric and magnetic properties of Fe3O4/BaTiO3/epoxy composites was studied. Initially, biphasic Fe 3 O 4 /epoxy and BaTiO 3 /epoxy composites were analyzed, and based on these results Fe 3 O 4 /BaTiO 3 /epoxy composite were conformed. In all the cases, dielectric properties were influenced by the frequency and filler concentration. In this way, Fe 3 O 4 /epoxy composites with high filler concentration showed high dielectric loss due to percolation effects and semiconducting properties of Fe 3 O 4 .Keywords: Composite materials, dielectric and magnetic properties. INTRODUCCIÓNLos materiales compuestos epoxi-BaTiO 3 , son desde hace varios años, una alternativa viable en la fabricación de condensadores integrados (CI) [1][2][3][4][5], dado que combinan la procesabilidad y baja temperatura de curado de la resina con la alta permitividad del cerámico [6][7].La necesidad de reducir aún más los costos de producción y el tamaño de los circuitos electrónicos, ha impulsado el estudio y desarrollo de nuevos materiales compuestos con aplicaciones múltiples. Estos sistemas, que poseen dos o más propiedades funcionales, pueden ser empleados en la fabricación, tanto de inductores como de condensadores o resistores, con bajos costos y tiempos de producción. A tal efecto, los compuestos Fe 3 O 4 /BaTiO 3 /epoxi, pueden cubrir algunos de estos requerimientos. Al igual que los compuestos epoxi/BaTiO 3 , estos materiales cuentan con la facilidad de procesamiento de las resinas epoxi, buena permitividad del titanato, y también con propiedades ferrimagnéticas debido a la presencia de la Fe 3 O 4 [8][9].Uno de los principales problemas que presentan estos sistemas es la dificultad de combinar eficientemente las propiedades de cada fase sin afectar las características del conjunto. La baja concentración de algún relleno puede no ser suficiente para generar cambios, mientras que altas concentraciones pueden inhibir las propiedades de las otras [6,10].El objetivo del presente trabajo es analizar las propiedades dieléctricas y magnéticas de compuestos preparados a partir de la dispersi...

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Dielectric response and relaxation phenomena in composites of epoxy resin with BaTiO3 particles

Cited by 139 publications

References 8 publications

Dielectric behaviour of CaCu3Ti4O12-epoxy composites

Dielectric behaviour of CaCu3Ti4O12-epoxy composites

The effect of processing conditions on the morphology, thermomechanical, dielectric, and piezoelectric properties of P(VDF-TrFE)/BaTiO3 composites

Microestructura y propiedades de compuestos de Fe3O4/BaTiO3/epoxi

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