Molten salt synthesis and magnetic anisotropy of multiferroic Bi4NdTi3Fe0.7Ni0.3O15 ceramics

Chen, Xiaoqin; Lu, Zhangwu; Han, Feng; Jiang, Min; Li, Jihui; Xiao, Jun; Zeng, Xiangbin

doi:10.1016/j.jallcom.2016.09.214

Cited by 18 publications

(7 citation statements)

References 36 publications

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“…In many cases synthesis using a molten salt method is superior; the use of salt fluxes as the reaction medium gives many advantages such as lower-temperature synthesis, fast ionic diffusion, and high reaction rates [14]. Molten sulfate and chloride salts have been widely applied to synthesize multiferroic Aurivillius phases [8,15,16]. The precise nature of the salt flux plays a crucial role in determining the compositional and grain homogeneity of the product, which in turn strongly affects the physical properties.…”

Section: Introductionmentioning

confidence: 99%

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

Wendari

Arief

Mufti

et al. 2020

Ceramics International

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The double-layer Aurivillius phase Pb 0.4 Bi 2.1 La 0.5 Nb 1.7 Mn 0.3 O 9 was synthesized by a molten salt method using a K 2 SO 4 /Na 2 SO 4 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 Mn 3+ and Mn 4+ ; the unit cell volume of the single-phase products decreases as the proportion of salt increases, which implies a higher proportion of smaller Mn 4+ 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 Mn 3+ and Mn 4+ , 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.

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Section: Introductionmentioning

confidence: 99%

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

Wendari

Arief

Mufti

et al. 2020

Ceramics International

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“…To the best of our knowledge, the synthesis of this formula has not previously been reported. We use the molten salt method since it was reported to have successfully synthesized the multiferroic Aurivillius phase 12,13 . In this paper, the synthesis, crystal structure, and dielectric properties of products were investigated.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Aurivillius Phase CaBi4Ti4O15 Doped with both La3+ and Mn3+ Cations: Crystal Structure and Dielectric Properties

et al. 2020

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The four-layer Aurivillius CaBi 4 Ti 4 O 15 with introducing of La 3+ on the A-site and Mn 3+ on the B-site with the formula Ca 1-x Bi 3+x LaTi 4-x Mn x O 15 (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) were synthesized by molten salt method using the mixture of sulfate salts K 2 SO 4 /Na 2 SO 4 as the flux. XRD data confirmed the formation of single-phase Aurivillius with A2 1 am orthorhombic structure for x = 0, 0.2, 0.4, and 0.6, whereas for x = 0.8 and 1, the impurity phases were observed. SEM analysis shows the anisotropic plate-like grains, which are a typical grain of Aurivillius phases. The cell volume decreases with increasing x, indicating a presence of mixed valences of Mn 3+ and Mn 4+. The dielectric constants increased with x, strongly correlated with the higher distortion of the structure, since the 6s 2 lone pair electrons of Bi 3+ cation increase. The presence of Mn 3+ unpaired electrons results in the increase of dielectric loss as increasing x.

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“…Ion substitution for both Bi and Fe sites can have a greater impact on the electric and magnetic properties than that of the substitution for Fe site, such as the co-doping of Nd and Ni [134], Nd and Co [135], Gd and Co [136], and Sr and Co [137]. Among those, Sr and Co co-doped SrBi 5 Fe 0.5 Co 0.5 Ti 4 O 18 ceramic [138] could improve FE and FM properties, giving rise to 2P r~5 2.4 µC/cm 2 at the electric field of 170 kV/cm and 2M r~2 .24 emu/g ( Figure 5).…”

Section: Chemical Modificationmentioning

confidence: 99%

“…Comparing to randomly oriented ceramics, grain-oriented ceramics have attractive anisotropic magnetism. For example, Chen et al [134] [173] ceramics were reported too. The morphology of the films could be modified by changing the substrate orientation.…”

Section: Anisotropic Ceramics and Thin Filmsmentioning

confidence: 99%

Progress and Perspectives on Aurivillius-Type Layered Ferroelectric Oxides in Binary Bi4Ti3O12-BiFeO3 System for Multifunctional Applications

Sun

Yin

2020

Crystals

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Driven by potentially photo-electro-magnetic functionality, Bi-containing Aurivillius-type oxides of binary Bi4Ti3O12-BiFeO3 system with a general formula of Bin+1Fen−3Ti3O3n+3, typically in a naturally layered perovskite-related structure, have attracted increasing research interest, especially in the last twenty years. Benefiting from highly structural tolerance and simultaneous electric dipole and magnetic ordering at room temperature, these Aurivillius-phase oxides as potentially single-phase and room-temperature multiferroic materials can accommodate many different cations and exhibit a rich spectrum of properties. In this review, firstly, we discussed the characteristics of Aurivillius-phase layered structure and recent progress in the field of synthesis of such materials with various architectures. Secondly, we summarized recent strategies to improve ferroelectric and magnetic properties, consisting of chemical modification, interface engineering, oxyhalide derivatives and morphology controlling. Thirdly, we highlighted some research hotspots on magnetoelectric effect, catalytic activity, microwave absorption, and photovoltaic effect for promising applications. Finally, we provided an updated overview on the understanding and also highlighting of the existing issues that hinder further development of the multifunctional Bin+1Fen−3Ti3O3n+3 materials.

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Molten salt synthesis and magnetic anisotropy of multiferroic Bi4NdTi3Fe0.7Ni0.3O15 ceramics

Cited by 18 publications

References 36 publications

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

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

Synthesis of Aurivillius Phase CaBi4Ti4O15 Doped with both La3+ and Mn3+ Cations: Crystal Structure and Dielectric Properties

Progress and Perspectives on Aurivillius-Type Layered Ferroelectric Oxides in Binary Bi4Ti3O12-BiFeO3 System for Multifunctional Applications

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