Formation of Diborides of Groups IV–VI Transition Metals During Mechanochemical Synthesis

Makarenko, G. N.; Krushinskaya, L. A.; Timofeeva, I. I.; Matsera, V. E.; Vasilkovskaya, M.A.; Уварова, І. В.

doi:10.1007/s11106-015-9645-3

Cited by 15 publications

(6 citation statements)

References 7 publications

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“…Torabi et al prepared nano MoB powder (containing the impurities of other borides) via mechanically induced self‐sustaining reaction (MSR) using Mg, MoO 3 and B 2 O 3 as raw materials. Single phase MoB 2 was produced from the reaction between Mo and amorphous boron by MSR . Camurlu prepared single‐phase MoB using MoO 3 , B 2 O 3 and Mg as reactants through the method of mechanochemical synthesis followed by annealing.…”

Section: Introductionmentioning

confidence: 99%

“…Single phase MoB 2 was produced from the reaction between Mo and amorphous boron by MSR. 17,18 Camurlu 19 prepared single-phase MoB using MoO 3 , B 2 O 3 and Mg as reactants through the method of mechanochemical synthesis followed by annealing. Yeh and Hsu 20 prepared various kinds molybdenum boride from the reactant composed of MoO 3 , Mo, and B powders via self-propagating high-temperature synthesis.…”

Section: Introductionmentioning

confidence: 99%

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A facile pathway to prepare molybdenum boride powder from molybdenum and boron carbide

et al. 2020

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Molybdenum boride is an ideal hard and wear-resistant material. In this study, a new method is proposed for preparing molybdenum boride, by which Mo first reacts with B 4 C to generate the mixture of molybdenum boride and C, and then the product is decarburized by molten Ca to generate CaC 2 . Pure molybdenum boride could be obtained after acid leaching to remove the by-product CaC 2 . According to the experimental and thermodynamic calculation results, it is concluded that the single-phase MoB could be successfully prepared, while Mo 2 B, Mo 2 B 5 , and MoB 4 could not be synthesized by this method. Moreover, it was found that the particle size of finally prepared MoB is determined by particle size of raw Mo powder. The residual carbon content of the product could be decreased to 0.10 wt% after first reaction at 1673 K for 6 hours and then decarburization reaction at 1673 K for 6 hours. K E Y W O R D Sborides, carbides, impurities, morphology, particle size

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A facile pathway to prepare molybdenum boride powder from molybdenum and boron carbide

et al. 2020

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“…However, a high temperature (>1500°C) as well as a long production period are required for above‐mentioned methods to achieve complete reduction, which may result in a large particle size and a relatively poor sinterability 7 . In order to obtain HfB 2 powders with better properties at moderate temperatures, many researchers prefer to use mechanochemical synthesis, 8 mechanically activated borothermal reduction, 2 chemical rout with autoclave processing, 9 solution‐based processing combined with spark plasma sintering (SPS), 10 sol‐gel, 11 hydrothermal synthesis, 12 and preceramic polymer methods 13 . The solution‐derived precursor indicates a homogeneous atomic or molecular distribution among different components, which is beneficial for the conversion from precursor to ceramic with superior purity and compositional homogeneity at a low temperature in a relatively short time 14 .…”

Section: Introductionmentioning

confidence: 99%

A different chemical route to prepare hafnium diboride‐based nanofibers: Effect of chemical composition

Ghelich

Abdizadeh

Jahannama³

et al. 2020

Int J Applied Ceramic Tech

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This study reports on the synthesis of hafnium diboride (HfB2)‐based nanofibers via electrospinning of polyhafnoxanesal (PHO)‐based solution followed by pyrolyzing hafnium‐boron containing polyvinylpyrrolidone precursor fibers by a moderate heat treatment at 1500°C under argon atmosphere. The influence of the molar ratios of C/Hf and B/Hf in preceramic polymer method is investigated on the final phase of HfB2‐based nanofibers. Structural, thermal, microstructural, and physical properties of the hafnium‐based fibers are evaluated using Fourier transform infrared spectra (FTIR), thermogravimetry and differential scanning calorimetry (TG/DSC), X‐ray diffractometer (XRD), high‐temperature X‐ray diffraction (HT‐XRD), field‐emission scanning electron microscope/energy‐dispersive spectrometer (FE‐SEM/EDS), and Brunauer‐Emmett‐Teller (BET). The results unveiled that the acidic pH was the optimal condition needed for obtaining the single phase of HfB2 nanofibers. The precursor fibers with the stoichiometric ratio of 1:4:5 of Hf:B:C prepared under the acidic conditions converted into pure HfB2 nanofibers having rough and porous surface after pyrolysis at 1500°C for 2 hour in argon, whereas HfB2‐HfC composite nanofibers with smooth surface were produced in the neutral conditions. The HfB2 nanofibers with a mean diameter of ~100 nm prepared under the acidic conditions showed a higher specific surface area compared to HfB2‐HfC composite nanofibers with a diameter of ~121 nm derived in the neutral conditions.

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“…In the lite-rature, there are many allotropic phases of boron with transition elements. [13][14][15][16]. Five different solid state phases have been reported in the Mn-B binary phase diagram: the phase of Mn 2 B (tetragonal structure of the Al 2 Cu type, I4/mcm), MnB (orthorhombic structure of Fe-B type, Pnma), Mn 3 B 4 (orthorhombic structure of the Ta 3 B 4 type, Immm), MnB 2 (hexagonal structure of the AlB 2 type, P6/mmm), and MnB 4 (monoclinic structure of the MnB 4 , C2/m).…”

Section: Introductionmentioning

confidence: 99%

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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Formation of Diborides of Groups IV–VI Transition Metals During Mechanochemical Synthesis

Cited by 15 publications

References 7 publications

A facile pathway to prepare molybdenum boride powder from molybdenum and boron carbide

A facile pathway to prepare molybdenum boride powder from molybdenum and boron carbide

A different chemical route to prepare hafnium diboride‐based nanofibers: Effect of chemical composition

Fabrication and Characterization of Mn2B Nanoparticles by Mechanochemical Method

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