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AuthorSoreto Teixeira, S.
AuthorGraça, M. P. F.
AuthorDionisio, M.
AuthorIlcíkova, M.
AuthorMosnacek, J.
AuthorSpitalsky, Z.
AuthorKrupa, I.
AuthorCosta, L. C.
Available date2022-05-31T19:01:32Z
Publication Date2014
Publication NameJournal of Applied Physics
ResourceScopus
Identifierhttp://dx.doi.org/10.1063/1.4903735
URIhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84916240051&doi=http://dx.doi.org/10.1063%2f1.4903735&partnerID=40&md5=924428458e0aa4b52f25b009fde8b154
URIhttp://hdl.handle.net/10576/31895
AbstractLithium ferrite (LiFe5O8) is an attractive material for technological applications due to its physical properties, which are significantly dependent on the preparation method and raw materials. In this work, LiFe5O8 crystallites were obtained by controlled heat-treatment process at 1100 °C, of a homogeneous mixture of Li2O-Fe2O3 powders, prepared by wet ball-milling and using lithium and iron nitrates as raw materials. The main goal was the preparation of a flexible and self-standing tick composite film by embedding lithium ferrite particles in a polymeric matrix, taking advantage of the good mechanical properties of the polymer and of the electrical and dielectric properties of the ferrite. The selected polymer matrix was styrene-b-isoprene-b-styrene copolymer. To prepare the composites, the lithium ferrite particles were chemically modified in order to functionalize their surface. To analyse the influence of the particles surface modification, different composites were made, with modified and unmodified particles. The structure of the obtained composites was studied by FTIR, XRD, TGA, and DSC techniques. The dielectric properties were analysed, in the frequency range between 10 Hz and 1 MHz and in function of temperature in the range between −73 °C and 127 °C. These properties were related with the structure and concentration of the particles in the matrix network. The composites with the modified particles present higher dielectric constant, maintaining values of loss tangent sufficiently low (<10−2) that can be considered interesting for technological applications.
Languageen
PublisherAmerican Institute of Physics Inc.
SubjectBall milling
Composite films
Crystallites
Dielectric properties of solids
Ferrite
Film preparation
Hematite
Lithium compounds
Styrene
Chemically modified
Dielectric behavior
Elastomeric composite
Electrical and dielectric properties
Heat treatment process
Homogeneous mixtures
Styrene copolymers
Technological applications
Polymer matrix composites
TitleSelf-standing elastomeric composites based on lithium ferrites and their dielectric behavior
TypeArticle
Issue Number22
Volume Number116
dc.accessType Abstract Only


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