Lead-free Aurivillius phase Bi2LaNb1.5Mn0.5O9: structure, ferroelectric, magnetic, and magnetodielectric effects

Wendari, Tio Putra, Arief, Syukri, Mufti, Nandang, Blake, Graeme R., Baas, Jacob, Suendo, Veinardi, Prasetyo, Anton ORCID: https://orcid.org/0000-0003-1575-8634, Insani, Andon and Zulhadjri, Zulhadjri (2022) Lead-free Aurivillius phase Bi2LaNb1.5Mn0.5O9: structure, ferroelectric, magnetic, and magnetodielectric effects. Inorganic Chemistry, 61 (23). pp. 8644-8652. ISSN 0020-1669

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Abstract

Aurivillius phase Bi2LaNb1.5Mn0.5O9, derived from ferroelectric PbBi2Nb2O9 by simultaneous substitution of the A-site and B-site cations, was synthesized using a molten-salt method. Here, we discuss the structure–property relationships in detail. X-ray and neutron diffraction show that Bi2LaNb1.5Mn0.5O9 adopts an A21am orthorhombic crystal structure. Rietveld refinement analysis, supported by Raman spectroscopy, indicates that the Bi3+ ions occupy the bismuth oxide blocks, La3+ ions occupy the perovskite A-site, and Nb5+/Mn3+ ions occupy the perovskite B-site. Ferroelectric ordering takes place at 535 K, which coexists with local ferromagnetic order below 65 K. The cation disorder on the B-site results in relaxor-ferroelectric behavior, and the short-range ferromagnetic order can be attributed to Mn3+/Mn4+ double-exchange. Magnetodielectric coupling measured at 5 K and 100 kHz in a field of 5 T suggests the existence of intrinsic spin–lattice coupling with a magnetodielectric coefficient of 0.20%. These findings will provide significant impetus for further research into potential devices based on the magnetodielectric effect in Aurivillius materials.

Item Type:	Journal Article
Subjects:	03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030206 Solid State Chemistry
Divisions:	Faculty of Mathematics and Sciences > Department of Chemistry
Depositing User:	Dr Anton Prasetyo
Date Deposited:	23 May 2023 14:19

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