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Titel: Fine-grained magnetoelectric Sr0.5Ba0.5Nb2O6-CoFe2O4 composites synthesized by a straightforward one-pot method
Autor(en): Köferstein, RobertoIn der Gemeinsamen Normdatei der DNB nachschlagen
Öhler, Florian
Ebbinghaus, StefanIn der Gemeinsamen Normdatei der DNB nachschlagen
Erscheinungsdatum: 2022
Art: Artikel
Sprache: Englisch
Zusammenfassung: Magnetoelectric (Sr0.5Ba0.5Nb2O6)1−x−(CoFe2O4)x (x = 0.2–0.6) composites were prepared by a one-pot soft-chemistry synthesis using PEG400. Calcining at 700 °C resulted in nanocrystalline composite powders (dcryst. = 24–30 nm) which were sintered between 1050 and 1200 °C to ceramic bodies with relative densities up to 98%. SEM investigations confirm the formation of composite ceramics with a 0–3 connectivity and variable grain sizes from 0.2 to 3.6 μm for sintering up to 1150 °C, while sintering at 1200 °C leads both to a change in the microstructure and a considerable grain growth. Magnetic measurements at 300 K reveal ferrimagnetic behaviour with saturation magnetization values smaller than bulk CoFe2O4 and coercivities between 790 and 160 Oe. Temperature-dependent impedance spectroscopy showed that the relative permittivities decrease both with rising frequency and CoFe2O4 fraction. The frequency dependence of the impedance can be well described using a single RC circuit. Magnetoelectric measurements show the presence of pronounced field hystereses. The maximum magnetoelectric coefficient (αME) depends both on the CoFe2O4 fraction (x) and sintering temperature. The composite with x = 0.3 exhibits the largest αME value of 37 μV Oe−1 cm−1 (@ 900 Hz). With rising frequency of the AC driving field αME increases up to 300–400 Hz and is nearly constant until 1 kHz.
URI: https://opendata.uni-halle.de//handle/1981185920/83065
http://dx.doi.org/10.25673/81110
Open-Access: Open-Access-Publikation
Nutzungslizenz: (CC BY 4.0) Creative Commons Namensnennung 4.0 International(CC BY 4.0) Creative Commons Namensnennung 4.0 International
Sponsor/Geldgeber: Publikationsfonds MLU
Journal Titel: Materials chemistry and physics
Verlag: Elsevier
Verlagsort: New York, NY [u.a.]
Band: 278
Originalveröffentlichung: 10.1016/j.matchemphys.2021.125616
Enthalten in den Sammlungen:Open Access Publikationen der MLU

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