Mechanochemical processing and microstructural characterization of pure Fe 2 B nanocrystals

Şimşek, Tuncay; Baris, Mustafa; Kalkan, Bora

doi:10.1016/j.apt.2017.09.017

Cited by 15 publications

(4 citation statements)

References 61 publications

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“…However, it is difficult to classify CaCO 3 prepared by mechanochemical method as GCC or PCC, and thus we named this kind of CaCO 3 as mechanochemical CaCO 3 (MCC). The mechanochemical method has been used to prepare various inorganic materials because it is simple, has high production efficiency, and produces products with homogeneous size distribution . However, the mechanochemical preparation of CaCO 3 powder is rare .…”

Section: Introductionmentioning

confidence: 99%

“…The mechanochemical method has been used to prepare various inorganic materials because it is simple, has high production efficiency, and produces products with homogeneous size distribution. [13][14][15][16][17] However, the mechanochemical preparation of CaCO 3 powder is rare. 18,19 Tsuzuki et al obtained CaCO 3 product and sodium chloride (NaCl) byproduct by milling a solid mixture of CaCl 2 , Na 2 CO 3 and NaCl, in which NaCl was used as the salt diluent.…”

Section: Introductionmentioning

confidence: 99%

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The mechanochemical route of vaterite synthesis using sodium hexametaphosphate as an inorganic additive

Chen

et al. 2019

J Am Ceram Soc

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Vaterite is a metastable phase of CaCO3 and was prepared mechanochemically for the first time with the assistance of sodium hexametaphosphate (SHMP). First, CaCO3 was prepared without SHMP and was characterized using X‐ray diffraction (XRD) to study the effect of milling times and speeds on the polymorphs of product. The results indicate that the reaction is complete at 60 minutes producing only calcite. Additionally, amorphous CaCO3 (ACC) was obtained at a milling speed of 300 rpm, while calcite was obtained at 600 and 1000 rpm. Then, the effect of SHMP concentration on the fraction of vaterite was investigated, and the vaterite fraction increased with increasing SHMP amount. Subsequently, the effect of milling speed in the presence of 0.8 g of SHMP was studied, and the vaterite fraction increased with decreasing milling speed. Finally, gentler manual milling was employed, and the effect of the amount of added SHMP on vaterite formation was evaluated. The results confirmed that vaterite increased with increasing amounts of SHMP, and that vaterite formed more readily via manual milling than via mechanical milling. Observations with scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that calcite and vaterite particles formed by mechanical milling were irregular agglomerates composed of primary nanoparticles while calcite particles formed by manual milling were irregular microparticles. Moreover, vaterite readily aggregated into spherical particles as the amount of SHMP increased. To investigate the reaction process and mechanism, the ethanol‐washed product was characterized using XRD, SEM/EDS and TEM/SAED. The results demonstrate that ACC and calcite were concomitant during the milling process, and ACC transformed into vaterite during subsequent water washing.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The mechanochemical route of vaterite synthesis using sodium hexametaphosphate as an inorganic additive

Chen

et al. 2019

J Am Ceram Soc

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“…A lot of unique alloying materials such as nanocrystalline, quasicrystalline, amorphous and supersaturated solid solutions alloys can be synthesized with this method [6]. In the literature, it is obvious that metal borides studies with MA method have exponentially increased in recent years due to its simple and favorable features [10][11][12].…”

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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“…In addition to the aforementioned methods, FeB production can be made starting from semi-finished raw materials for low-volume specialized applications. The most widely used of these methods are solid state reaction of Fe and B, chemical reduction, mechanical alloying, molten salt electrolysis and metallothermic reduction processes [1,2,[6][7][8][9].…”

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confidence: 99%

Single Fe2B Phase Particle Production by Calciothermic Reduction in Molten Salt

Kartal

2022

Hittite Journal of Science and Engineering

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In this study, calciothermic single phase iron boride(Fe2B) production was investigated in a scalable molten salt system, starting from inexpensive, easily accessible oxide materials. First, the formation of Fe2B was examined in detail in the light of thermodynamic data and literature. After, effects of CaO amount (0-10 wt.%) and time (30-60 min) on particle synthesis were investigated under at constant 3.0 V cell voltage and 1273 K temperature. It was determined that the average current increased continuously with the increase in the amount of CaO, and the current efficiency increased up to 7% by weight of CaO. After the CaO ratio was determined, the effect of the electrolysis duration was examined. In durations experiments, it has been observed that, in 30 minutes’ duration, the particles are composed of Fe, Fe2B and FeB, and by increasing the experiment time to 60 min, single-phase Fe2B particles are obtained. The magnetic properties of the single-phase Fe2B particles obtained at the end of the experiment period of 60 minutes were investigated by VSM. The saturation magnetization, permanent magnetization and coercivity values of the Fe2B particles were determined as 90.718 emu/g, 33.311 Oe, 1.684 emu/g, respectively.

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Mechanochemical processing and microstructural characterization of pure Fe 2 B nanocrystals

Cited by 15 publications

References 61 publications

The mechanochemical route of vaterite synthesis using sodium hexametaphosphate as an inorganic additive

The mechanochemical route of vaterite synthesis using sodium hexametaphosphate as an inorganic additive

Fabrication and Characterization of Mn2B Nanoparticles by Mechanochemical Method

Single Fe2B Phase Particle Production by Calciothermic Reduction in Molten Salt

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