Magnetic wood-based biomorphic Sr3Co2Fe24O41 Z-type hexaferrite ecoceramics made from cork templates
authors Pullar, RC; Marques, P; Amaral, J; Labrincha, JA
nationality International
journal MATERIALS & DESIGN
author keywords Ecoceramics; Magnetic wood; Hexagonal ferrites; Cork; Natural templates; Z-type hexaferrites; Sr3Co2Fe24O41
keywords SILICON-CARBIDE CERAMICS; HEXAGONAL Z-FERRITE; BIOMIMETIC SYNTHESIS; TEMPERATURE; PRECURSORS; POWDER
abstract Ecoceramics (environmentally conscious ceramics) are biomimetic/biomorphic ceramics, which use a naturally occurring and sustainable material as a template for their unique morphology and structure. Usually woods (or lignocellulosics) are used, due to the inherent cellular nature of their microstructures. The wood is pyrolised and the resulting carbon skeleton impregnated with a fluid, and this is then heated to combust the carbon template and convert the fluid precursor into a ceramic, while maintaining the structure of the original natural template. For the first time, ecoceramics have been made from cork, a totally sustainable wood that is harvested without harming the tree. Also for the first time, ecoceramics have been made of soft magnetic Z-type hexaferrites, in this case the room temperature multiferroic strontium Z ferrite Sr3Co2Fe24O41 (SrZ). Cork powder was pyrolised at 1000 degrees C, infiltrated with an aqueous sol-gel SrZ precursor, and then heated at 1200 degrees C/2 h to produce the ecoceramic. The cellular structure of the cork was maintained, with a small reduction in the hexagonal cell dimension to 10 mu m diameter, but the cell walls remained 1-2 mu m thick, of a similar magnitude to the hexaferrite grain size. Both magnetic and XRD data agreed that there was a small portion of the SrW phase present in these ecoceramics as well, and the magnetic loop showed a magnetically soft ecoceramic with M-s = 59.5 A m(2) kg(-1) (at 3 T), and a low H-c of 16 kA m(-1). (C) 2015 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0264-1275
year published 2015
volume 82
beginning page 297
ending page 303
digital object identifier (doi) 10.1016/j.matdes.2015.03.047
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000358096700035
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