An evaluation of the Mn–Ga system: Phase diagram, crystal structure, magnetism, and thermodynamic properties

Liu, Hao

doi:10.1016/j.calphad.2019.101722

Cited by 16 publications

(7 citation statements)

References 72 publications

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“…These values represent approximately 97% of the ingot density. Since the typical density of Nd-Fe-B magnets produced by spark plasma sintering is 90-96% [29,30], the specimens consolidated at 773 K or higher had a sufficiently high density as magnets. Thus, the magnetic properties of the Mn-Ga magnets produced by consolidation at 773 K or higher were investigated.…”

Section: Resultsmentioning

confidence: 99%

“…More recently, manganese-based magnets, such as Mn-Ga magnets with a D0 22 phase and Mn-Bi magnets with a low-temperature phase (LTP), have been the focus of attention as prospective replacements for rare-earth magnets [17][18][19][20][21][22][23][24][25][26]. It has been reported that the Mn-Ga alloys produced by melt spinning consist of a D0 22 phase and exhibited high coercivity [27][28][29][30][31][32][33]. The advantage of Mn-Ga alloys is their high magnetocrystalline energy.…”

Section: Introductionmentioning

confidence: 99%

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Production of Mn-Ga Magnets

Saito,

Tanaka,

Nishio-Hamane

2024

Materials

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Mn-based magnets are known to be a candidate for use as rare-earth-free magnets. In this study, Mn-Ga bulk magnets were successfully produced by hot pressing using the spark plasma sintering method on Mn-Ga powder prepared from rapidly solidified Mn-Ga melt-spun ribbons. When consolidated at 773 K and 873 K, the Mn-Ga bulk magnets had fine grains and exhibited high coercivity values. The origin of the high coercivity of the Mn-Ga bulk magnets was the existence of the D022 phase. The Mn-Ga bulk magnet consolidated at 873 K exhibited the highest coercivity of 6.40 kOe.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Production of Mn-Ga Magnets

Saito,

Tanaka,

Nishio-Hamane

2024

Materials

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“…The synthesis of any inverse Heusler compound can be challenging, as the finite-temperature phase diagrams of the binary endpoints are often very complicated and the phase diagrams of the full ternary systems are not known. For example, the prototypical compound for the tetragonal inverse Heusler structure, Mn 3 Ga, forms by a lowtemperature peritectic reaction with numerous competing phases that need to be avoided to produce a highquality material [39,40]. Furthermore, the formation of chemical order is complicated by the coupling between chemical order and the structural transformation between the high-temperature austenite and low-T martensite phase [21,41,42].…”

Section: Magnetic Structure and Chemical Stability Of Mn2xy Tetragona...mentioning

confidence: 99%

Tuning magnetic antiskyrmion stability in tetragonal inverse Heusler alloys

Kitchaev¹,

Ven²

2021

Preprint

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The identification of materials supporting complex, tunable magnetic order at ambient temperatures is foundational to the development of new magnetic device architectures. We report the design of Mn2XY tetragonal inverse Heusler alloys that are capable of hosting magnetic antiskyrmions whose stability is sensitive to elastic strain. We first construct a universal magnetic Hamiltonian capturing the short-and long-range magnetic order which can be expected in these materials. This model reveals critical combinations of magnetic interactions that are necessary to approach a magnetic phase boundary, where the magnetic structure is highly susceptible to small perturbations such as elastic strain. We then computationally search for quaternary Mn2(X1, X2)Y alloys where these critical interactions may be realized and which are likely to be synthesizable in the inverse Heusler structure. We identify the Mn2Pt1−zXzGa family of materials with X = Au, Ir, Ni as an ideal system for accessing all possible magnetic phases, with several critical compositions where magnetic phase transitions may be actuated mechanically.

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“…Besides, the natural abundance of Ga is more than that of Bi [18]. Like the Mn-Bi and Mn-Al alloys, the phase formation in the Mn-Ga system is rather complicated due to the existence of many intermetallic phases such as MnGa 2 , Mn 3 Ga, Mn 5 Ga 7 , Mn 2 Ga 5 , Mn 8 Ga 5 K [25]. Among them, the D0 19 -Mn 3 Ga (hexagonal), D0 22 -Mn 3 Ga (tetragonal) and Cu 3 Au-type (cubic) phases are mainly formed [26].…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

Pham

Nguyen

Lam

et al. 2023

Mater. Res. Express

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In this work, we investigated structure and magnetic properties of Mn65Ga20Al15-xCux (x = 0, 5, 10 and 15) alloy ribbons prepared by melt-spinning method combined with annealing. The annealing temperature was varied from 250°C to 350°C, and the annealing time was changed from 5 h to 20 h. Concentration of Cu and annealing process significantly influence on the formation of the desired phases in the alloy ribbons. The D022-type Mn3Ga crystalline phase with the hexagonal structure, which characterizes hard magnetic property of Mn-Ga based alloys, is enhanced after an appropriate annealing process. The change of grain size after annealing also contributes to the increased coercivity of the alloy ribbons. The highest coercivity of 12.9 kOe and saturation magnetization of 18.7 emu/g are achieved on the alloy ribbons with Cu concentration of 10%. The simultaneous enhancement of these magnetic parameters has an important significance for application possibility of the Mn-Ga based alloys.

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An evaluation of the Mn–Ga system: Phase diagram, crystal structure, magnetism, and thermodynamic properties

Cited by 16 publications

References 72 publications

Production of Mn-Ga Magnets

Production of Mn-Ga Magnets

Tuning magnetic antiskyrmion stability in tetragonal inverse Heusler alloys

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

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