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Structural, magnetic, and dielectric studies of cubically ordered Sr2FeMnO6

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Abstract

In this study, we determined the atomic composition, microstructure, crystallography, magnetisation, thermal, and dielectric properties of a double perovskite Sr2FeMnO6 system synthesised using sol–gel and sintering methods. X-ray fluorescence confirms the atomic composition of the Sr2FeMnO6 system. Scanning electron microscopy and energy-dispersive X-ray analyses reveal nonuniform grain distribution, with an average grain size of approximately 2.12 µm. X-ray diffraction analysis confirms that the Sr2FeMnO6 crystallised as a double-perovskite structure with a cubic cell belonging to Fm3m (225) symmetry. X-ray photoelectron spectroscopy (XPS) spectra of Fe 2p and Mn 2p core levels confirm the mixed chemical ionic states of Fe (Fe3+ and Fe4+) and Mn (Mn3+ and Mn4+) in the Sr2FeMnO6 system. O 1 s XPS spectra reveal oxygen existing in the form of lattice oxygen and oxygen vacancies while Sr is presented as Sr2+. The Raman phonon modes confirm phase purity and Fe/MnO6 octahedral vibration of the system. The Sr2FeMnO6 system exhibits a ferrimagnetic nature with a remnant magnetisation value of approximately 0.11 µB/f.u. Differential scanning calorimetry reveals a heat-flow peak temperature of 862.1 °C, which possibly corresponds to a magnetic transition temperature. Finally, the temperature-dependent dielectric constant confirms the existence of a ferroelectric–paraelectric transition at 528 K. Dielectric relaxation behaviour, with an activation energy of approximately 1.93 eV, is observed and is caused by the thermal motion of double ionised oxygen vacancies.

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Acknowledgements

This work was supported by the Universitas Indonesia under grant: HIBAH PUTI Q2 No NKB-4238/UN2.RST/HKP.05.00/2020.

Funding

Universitas Indonesia, NKB-4238/UN2.RST/HKP.05.00/2020, Djoko Triyono.

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Authors and Affiliations

  1. Department of Physics, Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Indonesia Depok, Depok, 16424, Indonesia

    D. Triyono & Afla Hannisa

  2. Department of Physics, National Taiwan Normal University, 11677, Taipei, Taiwan

    Heidi Laysandra

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  1. D. Triyono
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  2. Afla Hannisa
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  3. Heidi Laysandra
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Correspondence to D. Triyono.

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Triyono, D., Hannisa, A. & Laysandra, H. Structural, magnetic, and dielectric studies of cubically ordered Sr2FeMnO6. Appl. Phys. A 128, 232 (2022). https://doi.org/10.1007/s00339-022-05372-9

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