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Ratio effect of salt fluxes on structure, dielectric and magnetic properties of La,Mn-doped PbBi2Nb2O9 Aurivillius phase

Wendari, T. P., Arief, S., Mufti, N., Baas, J., Blake, G. R. & Zulhadjri, N. V., Jul-2020, In : Ceramics International. 46, 10, p. 14822-14827 6 p.

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  • Ratio effect of salt fluxes on structure, dielectric and magnetic properties of La,Mn-doped PbBi2Nb2O9 Aurivillius phase

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DOI

The double-layer Aurivillius phase Pb0.4Bi2.1La0.5Nb1.7Mn0.3O9 was synthesized by a molten salt method using a K2SO4/Na2SO4 flux. The effect on the crystal structure, morphology, dielectric and magnetic properties of varying the molar ratio of the oxide precursors to salt flux was investigated. Single-phase products with an orthorhombic structure were obtained for oxide to salt ratios of between 1:5 and 1:9, whereas for lower concentrations of salt a pyrochlore impurity phase is found in the products. SEM showed anisotropic plate-like grains, the size of which increases for larger salt ratios. An investigation of the magnetic properties showed the presence of mixed Mn3+ and Mn4+; the unit cell volume of the single-phase products decreases as the proportion of salt increases, which implies a higher proportion of smaller Mn4+ cations. This can be explained by the oxide ion donating properties (oxobasicity) of the molten salt mixture, which produces an oxidizing environment during synthesis. The best dielectric properties are obtained for an oxide to salt ratio of 1:7, exhibiting relaxor ferroelectric behavior. This is also the ratio at which the most pronounced ferromagnetic properties are observed, resulting from double-exchange interactions between Mn3+ and Mn4+ the proportions of which are approximately equal. Pb(0.4)Bi(2.1)La(0.5)Nb(1.7)Mn(0.3)O(9 )synthesized under these conditions thus exhibits optimal multiferroic properties.

Original languageEnglish
Pages (from-to)14822-14827
Number of pages6
JournalCeramics International
Volume46
Issue number10
Publication statusPublished - Jul-2020

    Keywords

  • Aurivillius phase, Molten salt method, Ferroelectric behavior, Double-exchange interaction, FERROELECTRIC PROPERTIES

ID: 127065792