Effect of microstructure on hydrogen absorption in LaMg2Ni

Chio, M. Di; Ziggiotti, Alessandro; Baricco, Marcello

doi:10.1016/j.intermet.2007.08.004

Cited by 27 publications

(23 citation statements)

References 21 publications

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“…For this reason, in the last years several Mg-Ni compositions (with Ni content up to 50 wt%) were explored, in the attempt to balance the hydrogen capacity and the sorption rates from the viewpoint of reversible storage [16]. Moreover, it was shown that the addition of a third component, such as another transition metal [17][18][19] or a rare earth metal [20,21], can further improve the hydrogenation kinetics of the storage systems.…”

Section: Introductionmentioning

confidence: 99%

Mg–Ni–Cu mixtures for hydrogen storage: A kinetic study

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Mg–Ni–Cu mixtures for hydrogen storage: A kinetic study

et al. 2010

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“…This suggests that LaMg2Ni starts absorbing deuterium below 0.001 MPa and with changes in the crystal structure. The deuteration reaction temperature and pressure are much lower than in previous reports [8][9][10][11][12]. The remaining LaMg2NiD4.6, which is approximately 30 wt.% in the PND analyzed by the Rietveld refinement, at 4.34 MPa is attributed to the slow kinetics of the deuteration reaction from LaMg2NiD4.6 to LaMg2NiD7 at room temperature.…”

Section: Experimental Methodsmentioning

confidence: 57%

“…In contrast, the complex hydride LaMg2NiH7 reported by Yvon et al, composing of La 3+ , 2×Mg 2+ , [NiH4] 4-, and 3×H -, is formed from an intermetallic compound LaMg2Ni where the metal atomic framework of LaMg2Ni is maintained ( Fig. 1) [8][9][10][11]. Then, the formation process of LaMg2NiH7 is suggested to infer from the atomic arrangements in the same manner that many interstitial hydrides have been investigated.…”

Section: Introductionmentioning

confidence: 95%

In-situ powder neutron diffraction study on the formation process of LaMg 2 NiH 7

Sato

Ikeda

Matsuo

et al. 2017

International Journal of Hydrogen Energy

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The formation process from the intermetallic compound LaMg2Ni to a complex hydride (deuteride) LaMg2NiD7 composed of La 3+ , 2×Mg 2+ , [NiD4] 4-, and 3×D -was investigated by in-situ powder neutron diffraction under deuterium gas pressure at room temperature. Below 0.001 MPa, small amount of deuterium was initially dissolved in the lattice of LaMg2Ni forming LaMg2NiD0.05 and two new hydride phases (LaMg2NiD x 1 and LaMg2NiD x 2) were continuously yielded. Furthermore, LaMg2NiD4.6 with NiD1.9 and NiD3.3 units and interstitial deuterium atoms was formed prior to appearing of LaMg2NiD7. From their Bragg peak positions, the deuterium contents x1, and x2 were inferred as 0.05 < x1 < x2 < 4.6. At approximately 0.001 MPa, LaMg2NiD7 started forming. Since the intermediate deuterides had similar metal atomic framework of LaMg2Ni, we revealed that LaMg2NiD7 formation proceeded through multiple deuteride phases with maintaining of the metal atomic framework of LaMg2Ni.

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“…The peaks of LaH2.46, Mg, Mg2Ni, and MgH2 were observed after the hydrogen desorption process. When hydrogenation is carried out, the LaMg2Ni phase decompounds to an La phase and an Mg2Ni phase, the La phase then forms a stable La hydride, and the Mg2Ni turns into Mg2NiH4 in the hydrogen atmosphere [19,20]. The reaction of the LaMg2Ni phase can be summarized as follows:…”

Section: Resultsmentioning

confidence: 99%

Phase Transformation and Hydrogen Storage Properties of an La7.0Mg75.5Ni17.5 Hydrogen Storage Alloy

Nan

et al. 2017

Crystals

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X-ray diffraction showed that an La 7.0 Mg 75.5 Ni 17.5 alloy prepared via inductive melting was composed of an La 2 Mg 17 phase, an LaMg 2 Ni phase, and an Mg 2 Ni phase. After the first hydrogen absorption/desorption process, the phases of the alloy turned into an La-H phase, an Mg phase, and an Mg 2 Ni phase. The enthalpy and entropy derived from the van't Hoff equation for hydriding were −42.30 kJ·mol −1 and −69.76 J·K −1 ·mol −1 , respectively. The hydride formed in the absorption step was less stable than MgH 2 (−74.50 kJ·mol −1 and −132.3 J·K −1 ·mol −1 ) and Mg 2 NiH 4 (−64.50 kJ·mol −1 and −123.1 J·K −1 ·mol −1 ). Differential thermal analysis showed that the initial hydrogen desorption temperature of its hydride was 531 K. Compared to Mg and Mg 2 Ni, La 7.0 Mg 75.5 Ni 17.5 is a promising hydrogen storage material that demonstrates fast adsorption/desorption kinetics as a result of the formation of an La-H compound and the synergetic effect of multiphase.

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Effect of microstructure on hydrogen absorption in LaMg2Ni

Cited by 27 publications

References 21 publications

Mg–Ni–Cu mixtures for hydrogen storage: A kinetic study

Mg–Ni–Cu mixtures for hydrogen storage: A kinetic study

In-situ powder neutron diffraction study on the formation process of LaMg 2 NiH 7

Phase Transformation and Hydrogen Storage Properties of an La7.0Mg75.5Ni17.5 Hydrogen Storage Alloy

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