Hydrogen desorption curves of unmilled MgH 2 (solid symbols) and ball-milled (hollow symbols) MgH 2 under a hydrogen pressure of 0.15 bar [58]. Hydrogenation properties are very sensitive to these surface modifications. The ball-milled powders do not require activation compared to the conventional methods.

XRD patterns of (a) solid solutions of ZrO 2 and MO (M = Mg, Ca, Sr, Ba) after high energy ball milling for 2 h. (b) Na 3.1 Zr 1.95 M 0.05 Si 2 PO 12 (M = Mg, Ca, Sr, Ba) sintered at 1260 °C for ...

For preparations involving ball milling, hydantoin 3 (1 mg) and BLG (50 mg) were ball-milled at 30 Hz for 10 min, with a mixer mill (MM 400, Retsch, Germany) using 1.5 mL stainless-steel jars (with 20 stainless-steel balls, 3 mm Ø; m ball =0.033 g each, m tot =0.65 g). After milling, the resulting powder was treated as described above for the ...

First, Mg nanoparticles were synthesized by thermal desorption of bipyridyl complex of Mg and then MgH 2 nanoparticles were obtained by hydriding the Mg nanoparticles. Composite mixtures (MgH 2 + TiC) were prepared using high-energy ball milling. Structural analysis, morphology and particle size were investigated by X-rays diffractometer (XRD ...

a recent study [ 49] on the liquid ball milling m (bh 4) n -linh 2 (1/2 n molar ratio, n = 1 or 2, m = li, mg, ca) has confirmed that, by substituting of li + cations with ca and mg metals with higher electronegativity, [bh 4] - groups would be discharged from ca (bh 4) 2 and mg (bh 4) 2 more easily, which would initial hydrogen release at a …

SEM photos for (A) Mg starting material and (B) Mg + 10 wt.%Fe after 150 h of milling under 0.5 bar H 2 in a magneto Uni-ball device. In 1997, Zaluska et al. [ 63 ] reported a pioneering work about the properties of different as-milled hydride forming materials such as Mg, Mg 2 Ni, FeTi, and LaNi 5 .

10%Besides, the ball-milling leads to small size grains and increase J c and H c in MgB 2 at 5×10 5 A/m 2 at 8 T at 5 K . For the synthesis by high energy ball-milled in Y-based superconductors with various research groups for example, in 2012, Hamrita et al. synthesized the magnetoresistivity and microstructure of YBa 2 Cu 3 O y using planetary ...

We demonstrate improved hydrogen storage properties of a nanoscale Mg–B material made by surfactant ball milling MgB 2 in a mixture of heptane, oleic acid, and oleylamine. Transmission electron microscopy data show that Mg–B nanoplatelets are produced with sizes ranging from 5 to 50 nm, which agglomerate upon ethanol washing to produce an ...

The present study suggests the use of high energy ball milling to mix (to dope) the phase MgB2 with the AlB2 crystalline structure compound, ZrB2, with the same C32 hexagonal structure than MgB2, in different concentrations, enabling the maintenance of the crystalline phase structures practically unaffected and the efficient mixture with the dopant.

Two-dimensional (2D) antimonene nanosheets are prepared using a combination of ball milling and sonication-based liquid exfoliation and are used as an efficient electrocatalyst for the nitrogen reduction reaction (NRR). In 0.1 M KOH, a high NH3 yield of 180.4 μg h−1 mgCAT−1 and faradaic efficiency (FE) of 11 Journal of Materials Chemistry A HOT Papers 2020 Journal of …

Structure change with changing the RBM time. XRD patterns of elemental hcp-Mg powders after RBM time for (a) 0 h, (b) 12.5 h, and (c) 25 h, using, using Ni-balls milling media.The FE-HRTEM ...

The raw material ratio is only 25 mg, and the ball mill speed is only 100 r/min. In Buzaglo's study, the content of graphite was only 36 mg. In summary, these two ball milling methods have low production efficiency and high cost, so they are not suitable for road materials. 2.3. Influencing Factors of Grinding Efficiency

The development of a metal-free photoelectrode film is of great significance. Herein, graphitic carbon nitride (g-C 3 N 4) nanosheets with a concentration of up to 36 mg mL −1 were first obtained on a large scale using a wet ball-milling method. The obtained g-C 3 N 4 nanosheets exhibit 6- and 8-times higher activity in terms of photocatalytic H 2 evolution and nicotinamide …

A novel technique for reactive ball milling under a diborane atmosphere was developed, allowing solvent-free synthesis of borohydrides at room temperature, demonstrated by the synthesis of, e.g. LiBH 4, Li 2 B 12 H 12, Li 2 B 10 H 10, Mg(BH 4) 2, MgB 12 H 12 and Ca(BH 4) 2 [20–24].

This paper reports on the structural and magnetic properties of a ball-milled powder sample of (Fe 1−x Mn x) 75 P 15 C 10 (x = 0, 0.05, 0.1, 0.2, and 0.3) mixed metallic amorphous ribbons. X-ray diffraction patterns of the as-made powder samples demonstrate a structural phase transition from amorphous to the nanocrystalline structure having a tetragonal …

Synthesis and hydrogen storage behavior of Mg–V–Al–Cr–Ni high entropy alloys. Abstract The ternary MgVAl, MgVCr, MgVNi, quaternary MgVAlCr, MgVAlNi, MgVCrNi and quinary MgVAlCrNi alloys were produced by high energy ball milling (HEBM) under hydrogen pressure (3.0 MPa) as a strategy to find lightweight alloys for hydrogen storage ...

In this work, the obtained Mg55Co45 metastable alloy with BCC structure can reach a hydrogen storage capacity of 3.24 wt% (hydrogen per metal or H/M = 1.28, H/Mg = 2.33) at −15 °C and this ...