Manganese mono-boride, an inexpensive room temperature ferromagnetic hard material

Ma, Shengqiang; Bao, Kuo; Tang, Qiang; Zhu, Pinwen; Ma, Teng; Liu, Bo; Liu, Yazhou; Cui, Tian

doi:10.1038/srep43759

Cited by 51 publications

(33 citation statements)

References 62 publications

(77 reference statements)

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“…Metal borides constitute a class of materials that are still exotic to most chemists and material scientists, despite some excellent properties that have led to some key industrial applications such as hard magnets (Nd 2 Fe 14 B), superconductors (MgB 2 ), bulk refractory and conductive ceramics (ZrB 2 , HfB 2 ), and hard materials (TiB 2 ) . Also, several other properties of bulk metal borides have been the focus of many recent investigations, these include super hardness, thermoelectric and magnetic properties, materials for batteries, and catalysts . Transition metal boride materials have attracted considerable attention in recent years.…”

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confidence: 99%

A Simple, General Synthetic Route toward Nanoscale Transition Metal Borides

2018

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Most nanomaterials, such as transition metal carbides, phosphides, nitrides, chalcogenides, etc., have been extensively studied for their various properties in recent years. The similarly attractive transition metal borides, on the contrary, have seen little interest from the materials science community, mainly because nanomaterials are notoriously difficult to synthesize. Herein, a simple, general synthetic method toward crystalline transition metal boride nanomaterials is proposed. This new method takes advantage of the redox chemistry of Sn/SnCl , the volatility and recrystallization of SnCl at the synthesis conditions, as well as the immiscibility of tin with boron, to produce crystalline phases of 3d, 4d, and 5d transition metal nanoborides with different morphologies (nanorods, nanosheets, nanoprisms, nanoplates, nanoparticles, etc.). Importantly, this method allows flexibility in the choice of the transition metal, as well as the ability to target several compositions within the same binary phase diagram (e.g., Mo B, α-MoB, MoB , Mo B ). The simplicity and wide applicability of the method should enable the fulfillment of the great potential of this understudied class of materials, which show a variety of excellent chemical, electrochemical, and physical properties at the microscale.

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confidence: 99%

A Simple, General Synthetic Route toward Nanoscale Transition Metal Borides

2018

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“…Among the manganese borides only MnB with positive exchange interaction between Mn atoms shows ferromagnetic behavior while MnB 2 and Mn 3 B 4 are antiferromagnetic. MnB 4 phase is paramagnetic and Mn 2 B is non-magnetic [28]. The ferromagnetic behavior observed in our sample (Figure 6) could be attributed to the small amount of Fe/Cr impurities, which originates from milling experiment carried using hardened steel vial.…”

Section: Resultsmentioning

confidence: 64%

Fabrication and Characterization of Mn2B Nanoparticles by Mechanochemical Method

Şimşek¹,

Şimşek²,

Özcan³

2019

Journal of Boron

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In this study, elemental Mn and B initial materials were used to synthesize pure Mn 2 B nanocrystals by ball milling. Milling experiments were conducted with highenergy planetary ball mill in a hardened steel vial with hardened steel balls, under Ar atmosphere at 40:1 ball-to-powder ratio and 300 rpm rotating speed. As synthesized Mn 2 B nanocrystals phase structures and morphological/microstructural investigation were analyzed by X-Ray diffractometry (XRD) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDX), respectively. Particle size of Mn 2 B were calculated as 34.5 nm by Rietveld refinement. Furthermore, the magnetic behavior of nanocrystals were determined by vibrating sample magnetometer (VSM). Mn 2 B sample shows ferromagnetic behavior at room temperature with saturation magnetization of 13 emu/g and coercivity of 90 Oe.

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“…47 ture of 1600-1800°C. 48 Some borides, including WB 3 , 49 MnB, 50 Mn 3 B 4 , 51 and MoB 4 , 52 were also synthesized successively with a high pressure and high temperature method. In addition, Fokwa's group employed the arc-melting procedures to prepare several Mo-B phases (i.e., Mo 2 B, α-MoB, β-MoB, and α-MoB 2 ), containing about 10% weight percentage of impurity phases.…”

Section: Element Reaction Routementioning

confidence: 99%