Local rhombohedral symmetry in Tb0.3Dy0.7Fe2 near the morphotropic phase boundary

Ma, Tianyu; Liu, Xiaolian; Pan, Xingwen; Li, Xiang; Jiang, Yinzhu; Yan, Mi; Li, Huiying; Fang, Minxia; Ren, Xiaobing

doi:10.1063/1.4901646

Cited by 34 publications

(10 citation statements)

References 24 publications

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“…In addition, this local rhombohedral symmetry was further proved by high-resolution transmission electron microscopy. The local nanodomains of ferromagnetic rhombohedral and tetragonal phases coexist in Tb 0.3 Dy 0.7 Fe 2 , as shown in Figure 16 [74]. This is similar to the hierarchical nanodomain structure in ferroelectric materials.…”

Section: Structural Origin and Magnetic Morphotropic Phase Boundary (...supporting

confidence: 63%

Recent Advances in Magnetostrictive Tb-Dy-Fe Alloys

Yang

Zhou

et al. 2022

Metals

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As giant magnetostrictive materials with low magnetocrystalline anisotropy, Tb-Dy-Fe alloys are widely used in transducers, actuators and sensors due to the effective conversion between magnetic energy and mechanical energy (or acoustic energy). However, the intrinsic brittleness of intermetallic compounds leads to their poor machinability and makes them prone to fracture, which limits their practical applications. Recently, the addition of a fourth element to Tb-Dy-Fe alloys, such as Ho, Pr, Co, Nb, Cu and Ti, has been studied to improve their magnetostrictive and mechanical properties. This review starts with a brief introduction to the characteristics of Tb-Dy-Fe alloys and then focuses on the research progress in recent years. First, studies on the crystal growth mechanism in directional solidification, process improvement by introducing a strong magnetic field and the effects of substitute elements are described. Then, meaningful progress in mechanical properties, composite materials, the structural origin of magnetostriction based on ferromagnetic MPB theory and sensor applications are summarized. Furthermore, sintered composite materials based on the reconstruction of the grain boundary phase also provide new ideas for the development of magnetostrictive materials with excellent comprehensive properties, including high magnetostriction, high mechanical properties, high corrosion resistance and high resistivity. Finally, future prospects are presented. This review will be helpful for the design of novel magnetostrictive Tb-Dy-Fe alloys, the improvement of magnetostrictive and mechanical properties and the understanding of magnetostriction mechanisms.

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Section: Structural Origin and Magnetic Morphotropic Phase Boundary (...supporting

confidence: 63%

Recent Advances in Magnetostrictive Tb-Dy-Fe Alloys

Yang

Zhou

et al. 2022

Metals

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“…29)), Nd–Fe–B (the strongest permanent magnet, T C ∼585 K), and Fe–Co–V ( T C ∼1,014 K) commercial magnets. The solution-treated sample (black curve) suffers gradual magnetization deterioration upon heating to ∼700 K, which is similar to normal Curie transition.…”

Section: Resultsmentioning

confidence: 99%

Highly thermal-stable ferromagnetism by a natural composite

Ma¹,

Gou²,

Hu³

et al. 2017

Nat Commun

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All ferromagnetic materials show deterioration of magnetism-related properties such as magnetization and magnetostriction with increasing temperature, as the result of gradual loss of magnetic order with approaching Curie temperature TC. However, technologically, it is highly desired to find a magnetic material that can resist such magnetism deterioration and maintain stable magnetism up to its TC, but this seems against the conventional wisdom about ferromagnetism. Here we show that a Fe–Ga alloy exhibits highly thermal-stable magnetization up to the vicinity of its TC, 880 K. Also, the magnetostriction shows nearly no deterioration over a very wide temperature range. Such unusual behaviour stems from dual-magnetic-phase nature of this alloy, in which a gradual structural-magnetic transformation occurs between two magnetic phases so that the magnetism deterioration is compensated by the growth of the ferromagnetic phase with larger magnetization. Our finding may help to develop highly thermal-stable ferromagnetic and magnetostrictive materials.

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“…The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/crat.202100246 DOI: 10.1002/crat.202100246 Some recent works report that the breaking of the local symmetry in nanoscale leads to large magnetostrictive response. [11,12] The effect of local composition distribution on the magnetostrictive effect in Fe-Ga systems was also revealed by theoretical studies. [13,14] These works highlight the important role of the local structure in determining the magnetostrictive properties.…”

Section: Introductionmentioning

confidence: 88%

“…However, the detailed information of the local structure of RT 2 compounds is still rare. Ma et al [11] reported the local rhombohedral symmetry near the morphotropic phase boundary in Tb 0.3 Dy 0.7 Fe 2 . Recently, Chang et al studied the local structure of the Tb 0.4 Dy 0.6 Fe 2 and reported that the evolution of the local structure is different from the average structure.…”

Section: Introductionmentioning

confidence: 99%

Probing of Local Structure in Laves Compound TbFe₂

Kou

Chang

2022

Cryst. Res. Technol.

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The Laves compounds Tb1‐xDyxFe2 have attracted much interest due to the giant magnetostriction effect appearing at their morphotropic phase boundary compositions. Although previous studies have established the relationship between the average structure and magnetostrictive properties in these compounds, there is a lack of characterization of their local structures. In this paper, as a first step toward this goal, the evolution of the local structure of the terminal compound (TbFe2) of this system is reported, in an attempt to provide useful information about interatomic bonding in this system. The pair distribution function (PDF) results suggest that the compound presents the rhombohedral local crystal symmetry. The lattice at the local scale shows abnormal thermal expansion which is different from the long scale structure. The different role of the Tb─Fe bond and Fe─Fe bond in affecting the crystal lattice is revealed. These findings highlight the important role of local structure in determining the magnetostrictive properties of the Laves compounds.

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Local rhombohedral symmetry in Tb0.3Dy0.7Fe2 near the morphotropic phase boundary

Cited by 34 publications

References 24 publications

Recent Advances in Magnetostrictive Tb-Dy-Fe Alloys

Recent Advances in Magnetostrictive Tb-Dy-Fe Alloys

Highly thermal-stable ferromagnetism by a natural composite

Probing of Local Structure in Laves Compound TbFe₂

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Local rhombohedral symmetry in Tb0.3Dy0.7Fe2 near the morphotropic phase boundary

Cited by 34 publications

References 24 publications

Recent Advances in Magnetostrictive Tb-Dy-Fe Alloys

Recent Advances in Magnetostrictive Tb-Dy-Fe Alloys

Highly thermal-stable ferromagnetism by a natural composite

Probing of Local Structure in Laves Compound TbFe2

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Probing of Local Structure in Laves Compound TbFe₂