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Title: Deciphering the Structural Characterization, Hirshfeld Surface Analysis, Raman Studies, and Temperature-Dependent Magnetodielectric Properties of BiMn2O5
Authors: Felhi, Houda
Smari, Mourad 
Mansouri, Saber
Massoudi, Jalel
Dhahri, Essebti
Keywords: multiferroics; Hirshfeld surface; Raman spectra; magnetodielectric; relaxation
Issue Date: 2021
Publisher: MDPI AG
Project: Tunisian National Ministry of Higher Education, Scientific Research and Technology 
Serial title, monograph or event: Magnetochemistry
Volume: 7
Issue: 5
Abstract: We investigate the structural, Hirshfeld surface, magnetic, and magnetodielectric properties of BiMn2O5. The sample can be indexed with an orthorhombic phase associated with space group Pbam, with crystallographic parameters a = 7.54946 Å, b = 8.54962 Å and c = 5.753627 Å. The Hirshfeld surface analysis, associated with 2D fingerprint plots, was used to visualize and explore the significant intermolecular interactions in the crystal structure quantitatively. The Raman spectra, measured from 6 to 300 K in a frequency range between 250 and 750 cm􀀀1, exhibit good agreement between the SHELL model calculations and the experimental measurement of the proximity of the phonon frequencies for our sample. Furthermore, magnetic measurements show that BiMn2O5 becomes antiferromagnetic below the Néel temperature (TN)—the temperature above which an antiferromagnetic material becomes paramagnetic (TN = 31 K). The relaxation at intermediate temperatures (200–300 K) can be attributed to the polar jump process at two charge transfer sites between the Mn3+ and Mn4+ ions, which, in combination with the special arrangement of the Mn3+/Mn4+ ions, is likely to produce the strong intrinsic magnetodielectric effect (MD) in the same temperature range.
ISSN: 2312-7481
DOI: 10.3390/magnetochemistry7050068
Rights: openAccess
Appears in Collections:LIBPhys - Artigos em Revistas Internacionais

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