Investigation on structure, dielectric and magnetic properties of the four-layer Aurivillius phase Pb1-xBi3.5þxNd0.5Ti4-xMnxO15 prepared via molten salt method
| Main Authors: | Zulhadjri, Zulhadjri, Wendari, Tio Putra, Septiani, Upita, Arief, Syukri |
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| Format: | Article PeerReviewed Book |
| Bahasa: | eng |
| Terbitan: |
Academic Press Inc
, 2020
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| Subjects: | |
| Online Access: |
http://repo.unand.ac.id/44132/1/2020%20-%20Journal%20of%20Solid%20State%20Chemistry%20292%20%28Q2%29%20_.pdf http://repo.unand.ac.id/44132/ https://www.sciencedirect.com/science/article/abs/pii/S0022459620305533?via%3Dihub https://doi.org/10.1016/j.jssc.2020.121723 |
Daftar Isi:
- In this study, the four-layer Aurivillius phases, Pb1-xBi3.5þxNd0.5Ti4-xMnxO15 (x 1⁄4 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 1⁄4 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 1⁄4 0.5. Keywords: Aurivillius phase Molten salt method Dielectric properties Magnetic properties Double-exchange interaction