Hydrogen storage properties and structure of La1−Mg (Ni1−Mn )3 intermetallics and their hydrides

Denys, R.V.; Riabov, B.; Yartys, V.A.; Delaplané, R. G.; Sato, Masashi

doi:10.1016/j.jallcom.2006.12.137

Cited by 93 publications

(44 citation statements)

References 23 publications

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“…Crystallographic parameters for the LaMg 2 Ni 9 and La 2 MgNi 9 phases obtained in this work well agree with the published data [2,3] and [8], respectively. Because of the large differences in atomic radii (r Mg = 1.602 Å vs. r La = 1.897 Å; r Pr = 1.81 Å; r Nd = 1.79 Å), increase in the Mg/RE ratio leads to a continuous decrease of both unit cell parameters, a and c, and volumes of the unit cells (see Figure 1).…”

Section: Compounds Re 3−x Mg X Ni 9 (Re=la Pr Nd) With Various Re/msupporting

confidence: 89%

“…In our work at the Institute for Energy Technology in Norway we have studied various aspects of the metal-hydrogen systems formed during substitution of La by Mg in LaNi 3 and La 2 Ni 7 compounds [3][4][5][6][7][8]. This work included (a) Systematic studies of the influence of magnesium on the crystal structure and hydrogenation behaviour of the PuNi 3 -type La 3−x Mg x Ni 9 (x = 0-2) intermetallic alloys [5]; (b) Neutron powder diffraction studies of the La 2 MgNi 9 D 13 deuteride, which witnessed local hydrogen ordering, with hydrogen sublattice built from the MgH 6 octahedra and NiH 4 tetrahedra [6]; (c) Probing the effect of magnesium content and quenching rate on the phase structure and composition of the rapidly solidified La 2 MgNi 9 metal hydride battery electrode alloy [7]; (d) Investigations of the interrelation between the high temperature annealing and phase composition and electrochemical properties of the Co-free La 2 MgNi 9 anode for the Ni-metal hydride batteries [8]; (e) Studies of the effect of La substitution by Nd on the phase-structural transformations in the RE 2 MgNi 9 -H 2 systems; and (f) In situ neutron powder diffraction studies of the charge-discharge processes in the metal hydride electrodes [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Structure–properties relationship in RE3−Mg Ni9H10–13 (RE = La,Pr,Nd) hydrides for energy storage

Yartys

Denys

2015

Journal of Alloys and Compounds

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Ternary RE 3-x Mg x Ni 9 intermetallics are promising battery electrode materials. Studies of the structure-properties relationships in the (La,Pr,Nd) 3-x Mg x Ni 9 H 10-13 hydrides and initial intermetallics revealed the following: a) Increase of magnesium content causes a gradual shrinking of the trigonal unit cells (a, c, V) for all studied RE metals, with the highest solubility range of Mg reached in REMg 2 Ni 9 ; b) Significant lowering of the thermodynamic stability follows an increase in magnesium content from x =1.0 to 1.1-1.2 and a replacement of La by Pr and Nd, with desorption pressures changing in a broad range, from 0.01 bar to 20 bar H 2 ; c) Neutron powder diffraction shows a nearly equal distribution of D atoms within the REMgNi 4 and RENi 5 layers; d) Local hydrogen ordering occurs within the H-sublattice built from MgH 6 octahedra and NiH 4 tetrahedra displaying a directional metal-hydrogen bonding. A partial substitution of Mg for RE allows the electrochemical discharge capacity of the (La,Pr,Nd) 3-x Mg x Ni 9 hydrides to become 25% greater than that of the commercial AB 5 -type electrodes, reaching 400 mAh/g. Synthesis of the materials with a high degree of homogeneity is important and has been achieved by choosing an appropriate synthesis route, content of Mg in the initial mixtures, and time and temperature of the homogenisation process.

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Section: Compounds Re 3−x Mg X Ni 9 (Re=la Pr Nd) With Various Re/msupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Structure–properties relationship in RE3−Mg Ni9H10–13 (RE = La,Pr,Nd) hydrides for energy storage

Yartys

Denys

2015

Journal of Alloys and Compounds

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“…Factors controlling this progress are diverse including hydrogen concentration, elastic modulus, hydrogen pressure, temperature, etc. [24,25]. For binary La-Ni system, studies on the hydrides of LaNi 3 and La 2 Ni 7 illustrate that hydrogen atoms only enter [LaNi 2 ] units and the borders of [LaNi 2 ] and [LaNi 5 ] slabs, but not inside the [LaNi 5 ] slabs [24][25][26][27].…”

Section: Discussionmentioning

confidence: 99%

“…[24,25]. For binary La-Ni system, studies on the hydrides of LaNi 3 and La 2 Ni 7 illustrate that hydrogen atoms only enter [LaNi 2 ] units and the borders of [LaNi 2 ] and [LaNi 5 ] slabs, but not inside the [LaNi 5 ] slabs [24][25][26][27]. Thus, anisotropic volume expansion of the hydrides takes place, especially anomalous extension along c-axis is introduced after hydrogenation, which is considered to be the main reason resulting in HIA.…”

Section: Discussionmentioning

confidence: 99%

Changes of crystal structure and hydrogen storage performances for multiphase La0.7Mg0.3Ni3 alloy upon gas–solid cycling

Zhang

et al. 2014

Rare Met.

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In order to examine the effects of structure stability on the degradation behaviors of multiphase La 0.7 Mg 0.3 Ni 3 alloy, changes of the crystal structure and hydrogen storage properties after gas-solid cycling were investigated in detail. The structural analysis identifies that (La,Mg)Ni 3 (PuNi 3 -type) phase transforms to amorphous, i.e., hydrogen-induced amorphization(HIA) occurs whereas LaNi 5 (CaCu 5 -type), (La,Mg) 2 Ni 7 (Ce 2 Ni 7 -type), and (La,Mg) 5 Ni 19 (Pr 5 Co 19 -type) phases still keep crystalline upon hydriding/dehydriding cycling. Partial amorphization remarkably affects both the gas-solid and electrochemical storage performances. The plateau of PCT curves becomes narrow and steep with cycling. Moreover, the maximum electrochemical capacity decreases notably after gas-solid hydrogenation repeats. The electrochemical capacity reduction could be ascribed to both drop of the maximum storage capacity and the slope of plateau induced by partial amorphization. For direct electrochemical cycling, it is suggested that the capacity decay is mainly attributed to HIA in the initial stage.

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“…8 [1e4] (R: rare earth metal) is a known hydrogenabsorbing alloy. RNi 3 (R ¼ Ce, La, Gd) exists as intermetallic compounds with superlattice structures [5,6].…”

Section: Introductionmentioning

confidence: 99%

Crystal structure of GdNi3 with superlattice alloy and its hydrogen absorption–desorption property

Iwase

Mori

Hoshikawa

et al. 2012

International Journal of Hydrogen Energy

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Hydrogen storage properties and structure of La1−Mg (Ni1−Mn )3 intermetallics and their hydrides

Cited by 93 publications

References 23 publications

Structure–properties relationship in RE3−Mg Ni9H10–13 (RE = La,Pr,Nd) hydrides for energy storage

Structure–properties relationship in RE3−Mg Ni9H10–13 (RE = La,Pr,Nd) hydrides for energy storage

Changes of crystal structure and hydrogen storage performances for multiphase La0.7Mg0.3Ni3 alloy upon gas–solid cycling

Crystal structure of GdNi3 with superlattice alloy and its hydrogen absorption–desorption property

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