[PDF]    https://doi.org/10.3952/physics.v57i2.3517

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 57, 103–111 (2017)
TEMPERATURE AND FREQUENCY DEPENDENCE OF THE DIELECTRIC AND PIEZOELECTRIC RESPONSE OF P(VDF-TrFE)/CoFe2O4 MAGNETOELECTRIC COMPOSITES
Šarūnas Svirskasa, Jaroslavas Belovickisa, Daumantas Šemeliovasa, Pedro Martinsb, Senentxu Lanceros-Méndezb,c,d, and Jūras Banysa
aFaculty of Physics, Vilnius University, Saulėtekio 9/3, LT-10222 Vilnius, Lithuania
bDepartment of Physics, University of Minho, 4710-057 Braga, Portugal
cBC Materials, Parque Científico y Tecnológico de Bizkaia, 48160-Derio, Spain
dIKERBASQUE, Basque Foundation for Science, Bilbao, Spain
E-mail: sarunas.svirskas@ff.vu.lt; jaroslavas.belovickis@ff.vu.lt; daumantas.semeliovas@ff.stud.vu.lt; martins@fisica.uminho.pt; lanceros@fisica.uminho.pt; juras.banys@ff.vu.lt

Received 15 March 2017; revised 10 April 2017; accepted 20 June 2017

CoFe2O4 nanoparticles embedded in polyvinylidene fluoride–trifluoroethylene (P(VDF–TrFE)) matrix show suitable properties for practical applications as piezoelectric and magnetoelectric transducers. The knowledge about the dielectric and electromechanical responses of the multiferroic films in a broad frequency and temperature range is essential for applicability. The purpose of this work is to investigate the dielectric, ferroelectric and piezoelectric properties of multiferroic composites based on P(VDF–TrFE) as a host matrix and CoFe2O4 as a magnetic filler. Free-standing films with a different concentration of the filler were investigated. The polarization switching was demonstrated for all the compositions. The polarization displacement hysteresis was achieved at different temperatures. The piezoelectric coefficient d33 is not affected by different concentration of ferrite. On the other hand, the composition with the largest weight % of CoFe2O4 shows higher coercive fields which is not favourable for applications. This indicates that the optimal content of the filler must be determined and taken into account when optimizing both ferroelectric and magnetoelectric properties.
Keywords: polymer-matrix composites (PMCs), smart materials, electrical properties
PACS: 81.05.Lg, 81.07.Bc, 77.55.Nv

DIELEKTRINIO IR PJEZOELEKTRINIO ATSAKO TEMPERATŪRINĖS IR DAŽNINĖS PRIKLAUSOMYBĖS MAGNETOELEKTRINIUOSE P(VDF-TrFE)/CoFe2O4 KOMPOZITUOSE
Šarūnas Svirskasa, Jaroslavas Belovickisa, Daumantas Šemeliovasa, Pedro Martinsb, Senentxu Lanceros-Méndezb,c,d, Jūras Banysa
aVilniaus universiteto Fizikos fakultetas, Vilnius, Lietuva
bMinho universitetas, Braga, Portugalija
cBiskajos mokslų ir technologijų parkas, Derio, Ispanija
dIkerbasque – Baskų mokslo fondas, Bilbao, Ispanija

Polivinilideno fluorido-trifluoroetileno (PVDF-TrFE) kopolimerai, palyginti su kitais polimerais, pasižymi geriausiomis pjezoelektrinėmis savybėmis. Darbe tyrinėjamas kompozitų, pagamintų PVDF-TrFE ir kobalto ferito pagrindu, dielektrinis ir pjezoelektrinis atsakas. Dviejų fazių multiferoikai – perspektyvios medžiagos, tačiau feroelektrinės ir magnetinės fazių funkcionalumą tokiose medžiagose realizuoti labai sunku. Visų pirma įtakos turi šių kompozitų homogeniškumas, sandūrų tarp skirtingų fazių savybės. Dėl šios priežasties būtina tyrinėti elektrinį ir elektromechaninį tokių inovatyvių kompozitų atsaką. Tyrimai leidžia nustatyti užpildo įtaką polimero matricai.
Dielektriniai tyrimai atskleidė, kad dalelės pasiskirsčiusios polimerinėje matricoje homogeniškai, nepastebėta parazitinių relaksacijų dėl nekokybiškų sandūrų tarp ferito ir polimero. Pjezoatsakas ir feroelektrinės histerezės yra palyginamos su grynuoju PVDF-TrFE polimeru. Tai reiškia, kad dėl papildomų atsiradusių sandūrų polimero savybės nedegraduoja, elektrinės ir pjezoelektrinės savybės išlieka nepakitusios. Šis rezultatas labai svarbus tolimesnei dvifazių multiferoikų raidai.
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