[PDF]    https://doi.org/10.3952/physics.v62i4.4817

Open access article / Atviros prieigos straipsnis
Lith. J. Phys. 62, 221–228 (2022)

PHOSPHATE BONDED CoFe2O4–BaTiO3 LAYERED STRUCTURES: DIELECTRIC RELAXATIONS AND MAGNETOELECTRIC COUPLING
Artyom Plyushcha, Daniil Lewinb, Povilas Ažubalisa, Vidmantas Kalendraa, Aliaksei Sokalc, Robertas Grigalaitisa, Vladimir V. Shvartsmanb, Soma Salamond, Heiko Wended, Algirdas Selskise, Konstantin N. Lapkoc, Doru C. Lupascub, and Jūras Banysa
a Faculty of Physics, Vilnius University, Saulėtekio 9, 10222 Vilnius, Lithuania
b Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 15, 45141 Essen, Germany
c Affiliation-independent researchers
d Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany
e Department of Structural Analysis of Materials, Center for Physical Sciences and Technology, Saulėtekio 3, 10257 Vilnius, Lithuania
Email: artyom.plyushch@ff.vu.lt

Received 14 October 2022; accepted 18 October 2022

Multilayered phosphate bonded CoFe2O4–BaTiO3–CoFe2O4 (CBC) and BaTiO3–CoFe2O4–BaTiO3 (BCB) multiferroic structures were formed by means of uniaxial pressing. The dielectric properties were studied in 20 Hz – 1 GHz frequency and 120–500 K temperature ranges. The complex dielectric permittivity is 15–0.17i for CBC and 22–0.04i for BCB, it is temperature- and frequency-independent below 250 K. At higher temperatures, strong dispersion appeared governed by the Maxwell–Wagner relaxation. Such behaviour is determined by the 2–2 connectivity of the sample. The highest direct magnetoelectric coupling coefficient was found for the BaTiO3–CoFe2O4–BaTiO3 structure of 0.2 mVOe–1cm–1.
Keywords: phosphate bonded ceramics, barium titanate, cobalt ferrite, layered structures, Maxwell–Wagner relaxation, multiferroics, magnetoelectrics, magnetoelectric coupling

FOSFATAIS SURIŠTI CoFe2O4–BaTiO3 SLUOKSNINIAI DARINIAI: DIELEKTRINĖS RELAKSACIJOS IR MAGNETOELEKTRINĖ SĄVEIKA
Artyom Plyushcha, Daniil Lewinb, Povilas Ažubalisa, Vidmantas Kalendraa, Aliaksei Sokalc, Robertas Grigalaitisa, Vladimir V. Shvartsmanb, Soma Salamond, Heiko Wended, Algirdas Selskise, Konstantin N. Lapkoc, Doru C. Lupascub, Jūras Banysa

a Vilniaus universiteto Fizikos fakultetas, Vilnius, Lietuva
b Duisburgo-Eseno universiteto Medžiagų mokslo institutas ir Nanointegracijos centras, Esenas, Vokietija
c Nepriklausomi nuo afiliacijos tyrėjai
d Duisburgo-Eseno universiteto Fizikos fakultetas ir Nanointegracijos centras, Duisburgas, Vokietija
e Fizinių ir technologijos mokslų centro Medžiagų struktūrinės analizės skyrius, Vilnius, Lietuva
Daugiasluoksniai fosfatais surišti CoFe2O4–BaTiO3–CoFe2O4 (CBC) ir BaTiO3–CoFe2O4–BaTiO3 (BCB) dariniai buvo pagaminti presavimo būdu. Dielektrinės savybės ištirtos 20 Hz – 1 GHz dažnių ir 120–500 K temperatūrų intervaluose. CBC ir BCB dariniuose buvo išmatuotos dielektrinės skvarbos vertės, 15–0,17i ir 22–0,04i atitinkamai, kurios nepriklauso nuo dažnio ir temperatūros žemiau 250 K. Aukštesnėse temperatūrose atsiranda stiprioji dispersija, būdinga Maksvelo–Vagnerio relaksacijai. Toks elgesys yra susijęs su 2–2 fazių erdviniu pasiskirstymu. BaTiO3–CoFe2O4–BaTiO3 darinyje buvo išmatuotas magnetoelektrinės sąveikos koeficientas, kurio gauta vertė yra 0,2 mVOe–1cm–1.


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