Unusual superparamagnetic behavior in bulk Ba0.198La0.784Ti0.096Fe0.8O3-δ


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Output type: Journal article

UM6P affiliated Publication?: Yes

Author list: El Bachraoui F., Tamraoui Y., Louihi S., Alami J., Shahbazian-Yassar R., Yuan Y., Amine K., Manoun B.

Publisher: Elsevier

Publication year: 2021

Journal: Materials Research Bulletin (0025-5408)

Volume number: 137

ISSN: 0025-5408

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098581792&doi=10.1016%2fj.materresbull.2020.111187&partnerID=40&md5=6523d9d07f09591318746ddf6ed5ddf5

Languages: English (EN-GB)


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Abstract

We report the observation of superparamgnetic behavior induced by the substitution La3+ by Ba2+ at A-sites and Fe+3 by Ti4+ at B-sites. Ba0.198La0.784Ti0.096Fe0.8O3-δ was synthesized via solid state reaction. The Rietveld refinements revealed an orthorhombic (Pbnm). The low-mag STEM results showed that the particles were found to exhibit square like shape and formed in single crystal with high degree of crystallinity. The particle size ranges of 50−300 nm. Element mapping demonstrates a complementary distribution between Ba and La, while homogenous distribution is found for Fe and O. The optical band gap determined from UV–vis analysis is equal to 1.93 eV which is smaller than the reported one for LaFeO3 and BaTiO3. The hysteresis loops at 300 K and 10 K show superparamagnetic behavior, which deviate extremely from the antiferromagnetic nature of LaFeO3 perovskite. The temperature dependent magnetization demonstrates that the material kept a net magnetization of 12.29 (emu/g) at very low temperature. © 2020 Elsevier Ltd


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Last updated on 2021-14-06 at 23:20