Synthesis and Magnetic Properties of the Boride Series MRh6–nRunB3 (M = Co, Ni; n = 1–5)

Park, Hyounmyung; Misse, Patrick R. N.; Mbarki, Mohammed; Shankhari, Pritam; Fokwa, Boniface P. T.

doi:10.1002/ejic.201700418

Cited by 3 publications

(1 citation statement)

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“…[7][8][9] The structurala nd bondingd iversity of borides is demonstrated by their broad range of properties and applications.F or example, Nd 2 Fe 14 Bi st he strongestp ermanentm agnet reported to date, [10] MgB 2 is as uperconductor below 39 K, [11] AlFe 2 B 2 is a promising magnetocaloric material, [12,13] ReB 2 and WB 4 are superhardm aterials, [14] and YbB 12 andS mB 6 are Kondo and topological insulators. [7] The recent discoveries of low-temperature superconductivity in TaRh 2 B 2 ,N bRh 2 B 2 , [15] and NbRuB, [16] high catalytic activity of Mo 2 B 4 for the hydrogen evolution reaction, [17] and itinerant magnetism in MRh 6Àn Ru n B 3 (M = Co, Ni; n = 1-5) [18] maintain the interest in the chemistry of borides.…”

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confidence: 99%

A Hydride Route to Ternary Alkali Metal Borides: A Case Study of Lithium Nickel Borides

Gvozdetskyi

Hanrahan

Ribeiro

et al. 2019

Chemistry A European J

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Ternary lithium nickel borides LiNi3B1.8 and Li2.8Ni16B8 have been synthesized by using reactive LiH as a precursor. This synthetic route allows better mixing of the precursor powders, thus facilitating rapid preparation of the alkali‐metal‐containing ternary borides. This method is suitable for “fast screening” of multicomponent systems comprised of elements with drastically different reactivities. The crystal structures of the compounds LiNi3B1.8 and Li2.8Ni16B8 have been re‐investigated by a combination of single‐crystal X‐ray/synchrotron powder diffraction, solid‐state 7Li and 11B NMR spectroscopies, and scanning transmission electron microscopy. This has allowed the determination of fine structural details, including the split position of Ni sites and the ordering of B vacancies. Field‐dependent and temperature‐dependent magnetization measurements are consistent with spin‐glass behavior for both samples.

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Section: Introductionmentioning

confidence: 99%

A Hydride Route to Ternary Alkali Metal Borides: A Case Study of Lithium Nickel Borides

Gvozdetskyi

Hanrahan

Ribeiro

et al. 2019

Chemistry A European J

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Boron: Enabling Exciting Metal-Rich Structures and Magnetic Properties

2017

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Boron's unique chemical properties and its reactions with metals have yielded the large class of metal borides with compositions ranging from the most boron-rich YB (used as monochromator for synchrotron radiation) up to the most metal-rich NdFeB (the best permanent magnet to date). The excellent magnetic properties of the latter compound originate from its unique crystal structure to which the presence of boron is essential. In general, knowing the crystal structure of any given extended solid is the prerequisite to understanding its physical properties and eventually predicting new synthetic targets with desirable properties. The ability of boron to form strong chemical bonds with itself and with metallic elements has enabled us to construct new structures with exciting properties. In recent years, we have discovered new boride structures containing some unprecedented boron fragments (trigonal planar B units, planar B rings) and low-dimensional substructures of magnetically active elements (ladders, scaffolds, chains of triangles). The new boride structures have led to new superconducting materials (e.g., NbRuB) and to new itinerant magnetic materials (e.g., NbFeIrB). The study of boride compounds containing chains (Fe-chains in antiferromagnetic ScFeRuB), ladders (Fe-ladders in ferromagnetic TiFeRhB), and chains of triangles (Cr chains in ferrimagnetic and frustrated TiCrIrB) of magnetically active elements allowed us to gain a deep understanding of the factors (using density functional theory calculations) that can affect magnetic ordering of such low-dimensional magnetic units. We discovered that the magnetic properties of phases containing these magnetic subunits can be drastically tuned by chemical substitution within the metallic nonmagnetic network. For example, the small hysteresis (measure of magnetic energy storage) of TiFeRhB can be successively increased up to 24-times by gradually substituting Ru for Rh, a result that was even surpassed (up to 54-times the initial value) for Ru/Ir substitutions. Also, the type of long-range magnetic interactions could be drastically tuned by appropriate substitutions in the metallic nonmagnetic network as demonstrated using both experimental and theoretical methods. It turned out that Ru-rich and valence electron poor metal borides adopting the TiCoB or the ThFe structure types have dominating antiferromagnetic interactions, while in Rh-rich (or Ir-rich) and valence electron rich phases ferromagnetic interactions prevail, as found, for example, in the ScFeRuRhB and FeRhRuB series. Fascinatingly, boron clusters (e.g., B rings) even directly interact in some cases with the magnetic subunits, an interaction which was found to favor the Fe-Fe magnetic exchange interactions in the ferromagnetic NbFeIrB. Using less expensive transition metals, we have recently predicted new itinerant magnets, the experimental proof of which is still pending. Furthermore, new structures have been discovered, all of which are being studied experimentally and computationally with the aim of...

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Unexpected Competition between Antiferromagnetic and Ferromagnetic States in Hf₂MnRu₅B₂: Predicted and Realized

et al. 2017

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Materials "design" is increasingly gaining importance in the solid-state materials community in general and in the field of magnetic materials in particular. Density functional theory (DFT) predicted the competition between ferromagnetic (FM) and antiferromagnetic (AFM) ground states in a ruthenium-rich TiCoB-type boride (HfMnRuB) for the first time. Vienna ab initio simulation package (VASP) total energy calculations indicated that the FM model was marginally more stable than one of the AFM models (AFM1), indicating very weak interactions between magnetic 1D Mn chains that can be easily perturbated by external means (magnetic field or composition). The predicted phase was then synthesized by arc-melting and characterized as HfMnRuB (x = 0.27). Vibrating-scanning magnetometry shows an AFM ground state with T ≈ 20 K under low magnetic field (0.005 T). At moderate-to-higher fields, AFM ordering vanishes while FM ordering emerges with a Curie temperature of 115 K. These experimental outcomes confirm the weak nature of the interchain interactions, as predicted by DFT calculations.

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Synthesis and Magnetic Properties of the Boride Series MRh_6–nRu_nB₃ (M = Co, Ni; n = 1–5)

Cited by 3 publications

References 23 publications

A Hydride Route to Ternary Alkali Metal Borides: A Case Study of Lithium Nickel Borides

A Hydride Route to Ternary Alkali Metal Borides: A Case Study of Lithium Nickel Borides

Boron: Enabling Exciting Metal-Rich Structures and Magnetic Properties

Unexpected Competition between Antiferromagnetic and Ferromagnetic States in Hf₂MnRu₅B₂: Predicted and Realized

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Synthesis and Magnetic Properties of the Boride Series MRh6–nRunB3 (M = Co, Ni; n = 1–5)

Cited by 3 publications

References 23 publications

A Hydride Route to Ternary Alkali Metal Borides: A Case Study of Lithium Nickel Borides

A Hydride Route to Ternary Alkali Metal Borides: A Case Study of Lithium Nickel Borides

Boron: Enabling Exciting Metal-Rich Structures and Magnetic Properties

Unexpected Competition between Antiferromagnetic and Ferromagnetic States in Hf2MnRu5B2: Predicted and Realized

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Synthesis and Magnetic Properties of the Boride Series MRh_6–nRu_nB₃ (M = Co, Ni; n = 1–5)

Unexpected Competition between Antiferromagnetic and Ferromagnetic States in Hf₂MnRu₅B₂: Predicted and Realized