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Structural and multiferroic properties in double-layer Aurivillius phase Pb0.4Bi2.1La0.5Nb1.7Mn0.3O9 prepared by molten salt method

Wendari, T. P., Arief, S., Mufti, N., Insani, A., Baas, J., Blake, G. R. & Zulhadjri, N. V., 15-Apr-2020, In : Journal of Alloys and Compounds. 820, 6 p., 153145.

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  • Structural and multiferroic properties in double-layer Aurivilliusphase Pb0.4Bi2.1La0.5Nb1.7Mn0.3O9prepared by molten salt metho

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A single-phase sample of the Aurivillius compound Pb0.4Bi2.La0.5Nb1.7Mn0.3O9 was prepared by a molten salt method using K2SO4/Na2SO4 as the flux. The crystal structure, morphology, ferroelectric, and magnetic properties were investigated. Neutron powder diffraction data confirmed a non-centrosymmetric orthorhombic crystal structure with space group A2(1)am and Pb/Bi disorder in the bismuth oxide blocks, Bi/Pb/La disorder on the perovskite A-site, and Nb/Mn disorder on the perovskite B-site. The morphology of the sample showed anisotropic plate-like grains as probed by scanning electron microscopy. The dielectric constant exhibits a transition peak between 600 K and 640 K that depends on frequency, indicating relaxor ferroelectric behavior. Electrical polarization versus applied field loops are unsaturated, with a remnant polarization of 0.43 mu C/cm(2) at 40 Hz under the maximum electrical field applied of 160 kV/cm. The ferroelectricity originates from the displacement of oxygen atoms in the BO6 octahedra, resulting in a polar structural distortion. Magnetic susceptibility measurements showed the presence of mixed Mn3+ and Mn4+, resulting in short-range ferromagnetic order via double exchange interactions below 33 K. The remnant magnetization (M-r) is 0.01 emu/g at 5 K. This mixed valence of Mn cations is mainly responsible for the high electrical conductivity. Thus, Pb0.4Bi2.La0.5Nb1.7Mn0.3O9 exhibits coexisting ferroelectric and ferromagnetic properties. (C) 2019 Elsevier B.V. All rights reserved.

Original languageEnglish
Article number153145
Number of pages6
JournalJournal of Alloys and Compounds
Volume820
Publication statusPublished - 15-Apr-2020

    Keywords

  • Double-layer Aurivillius phase, Molten salt method, Cation disorder, Multiferroic, Relaxor-ferroelectric behavior, Ferromagnetic interactions, ELECTRICAL-PROPERTIES, CATION DISORDER

ID: 125720009