Investigation on Structure, Dielectric and Magnetic Properties of the Four-layer Aurivillius Phase Pb1-xBi3.5+x Nd0.5 Ti4-xMnxO15 Prepared via Molten Salt Method

Zulhadjri, Zulhadjri (2020) Investigation on Structure, Dielectric and Magnetic Properties of the Four-layer Aurivillius Phase Pb1-xBi3.5+x Nd0.5 Ti4-xMnxO15 Prepared via Molten Salt Method. Journal of Solid State Chemistry, 292. pp. 1-7. ISSN 0022-4596

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Abstract

In this study, the four-layer Aurivillius phases, Pb1-xBi3.5þxNd0.5Ti4-xMnxO15 (x ¼ 0, 0.1, 0.3, and 0.5), were prepared by the molten salt method, in order to investigate the effects on crystal structure, morphology, dielectric and magnetic properties of varying x composition. XRD patterns revealed that of the all samples were single-phase products with an orthorhombic structure. The refinement result demonstrates a compressive unit cell volume with increasing x composition. Moreover, FTIR spectroscopy showed a single mode of BO6 octahedra, and the shifting of this mode indicates that the Mn3þ ions occupy the perovskite B-site. The anisotropic plate-like grain was probed by SEM, the size of which showed an increase with a higher x composition, as the proportion of Bi3þ increases. The dielectric properties also increase with an increasing x composition, which results from the increasing structural distortion and grain size. The investigation of the magnetic properties indicates that the ferromagnetic behavior for the x ¼ 0.5 sample, presumably originated from the double-exchange interactions between Mn3þ and Mn4þ and the spin canting of distorted Mn(1)O6 octahedra via the Dzyaloshinskii–Moriya interaction. The formation of the mixed-valent Mn3þ/Mn4þ could likely be caused by the oxidizing environment, produced by the oxobasicity properties of the sulfate salt in this molten-salt method. Therefore, the multiferroic properties exhibited at room temperature were due to the optimum dielectric and magnetic properties that were obtained at x ¼ 0.5.

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