Please use this identifier to cite or link to this item:
http://dx.doi.org/10.25673/81110
Title: | Fine-grained magnetoelectric Sr0.5Ba0.5Nb2O6-CoFe2O4 composites synthesized by a straightforward one-pot method |
Author(s): | Köferstein, Roberto![]() Öhler, Florian Ebbinghaus, Stefan ![]() |
Issue Date: | 2022 |
Type: | Article |
Language: | English |
Abstract: | 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: | ![]() |
License: | ![]() |
Sponsor/Funder: | Publikationsfonds MLU |
Journal Title: | Materials chemistry and physics |
Publisher: | Elsevier |
Publisher Place: | New York, NY [u.a.] |
Volume: | 278 |
Original Publication: | 10.1016/j.matchemphys.2021.125616 |
Appears in Collections: | Open Access Publikationen der MLU |
Files in This Item:
File | Description | Size | Format | |
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1-s2.0-S0254058421013997-main.pdf | 9.12 MB | Adobe PDF | ![]() View/Open |