ISSN:2321-6212

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Nanoparticles for soft ferrites: Influence on sintered microstructure


31st Materials Science and Engineering Conference: Advancement & Innovations

October 15-17, 2018 Helsinki, Finland

Carolina Clausell Terol, Antonio Barba Juan, Juan Carlos Jarque Fonfria, Luis Nuno-Fernandez

Jaume I University, Spain Technical University of Valencia, Spain

ScientificTracks Abstracts: Res. Rev. J Mat. Sci

DOI: 10.4172/2321-6212-C5-026

Abstract

Cu-doped NiZn ferrites are typical electromagnetic wave absorbers which absorption capacity (calculated from experimental measures of complex permeability and complex permittivity for a given frequency range) is related to thickness body and especially and more critical to its microstructure. Ideal microstructure would consist of sintered bodies with no porosity, small average grain size and narrow grain size distribution. Moreover, the finer grain sizes the better absorption capacity. Literature shows that physical properties of ceramic bodies improve when particle-size distribution decreases from the micro-scale to the nanoscale. Ferrites from nanoparticles have been sintered controlling average grain size and relative density with sintering temperature. Green microstructure has been set constant using uniaxial dry pressing at 200 MPa as the shaping method. Sintered microstructure has been observed by Scanning Electron Microscopy (SEM), obtaining the average grain size by image analysis of the SEM micrographs. Relative density was determined by the Archimedes method, using true density material value. Magnetic permeability was measured in the frequency range from 1 MHz to 3 GHz by using an Agilent model E4991 ARF impedance analyzer with the 16454A test fixture and this later parameter has been related to average grain size and relative density. Finally, the results obtained from nano-particulate ferrite powder have been compared with those previously obtained from micro-particulate ferrite powders, noting an improvement in performance. Aknowledgements The study has been partially funded by the Spanish National Plan for Scientific Research, Development, and Technology Innovation of the Spanish Minister of Economy and Competitiveness (project MAT2016-76320-R) and the Jaume I University of Spain (project UJI-B2017-48).

Biography

Carolina Clausell Terol has completed her PhD in Chemical Engineer in 2008 and MSc in Chemical Engineer in 1998, both from Jaume I University. She is the Member of the Ceramic Technology research group since 1997 and since 2012, teaching and research staff at the Chemical Engineering Department of the same university. Her research career is focused in the application of the chemical engineering principles to the ceramic materials production processes, which she develops at the research group and the department that she belongs to. Furthermore, she is a Member of the collaborating research group chemistry of electromagnetic radiation processed materials between the Jaume I University and the Spanish National Research Council (CSIC), through the Aragón Materials Science Institute (ICMA). She has collaborated in 38 research projects, funded by public institutions and private companies, resulting in 2 patents, numerous scientific articles in international journals of the ceramic materials field indexed in the journal citation report and several contributions to national and international conferences of the same research field.

E-mail: [email protected]

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