Textural evolution and improved ductility in Zn-0.2Mg-0.8Mn (wt%) alloys at different extrusion temperatures

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Structural and multiferroic properties in double-layer Aurivillius phase Pb 0 .4Bi2.1 La 05 Nb1.7Mn 03 0 9 prepared by molten salt method

Aurivillius phase Bi 2 LaNb 1.5 Mn 0.5 O 9 , derived from ferroelectric PbBi 2 Nb 2 O 9 by simultaneous substitution of the Asite and B-site cations, was synthesized using a molten-salt method. Here, we discuss the structure−property relationships in detail. Xray and neutron diffraction show that Bi 2 LaNb 1.5 Mn 0.5 O 9 adopts an A2 1 am orthorhombic crystal structure. Rietveld refinement analysis, supported by Raman spectroscopy, indicates that the Bi 3+ ions occupy the bismuth oxide blocks, La 3+ ions occupy the perovskite A-site, and Nb 5+ /Mn 3+ ions occupy the perovskite Bsite. 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 shortrange ferromagnetic order can be attributed to Mn 3+ /Mn 4+ doubleexchange. 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.