Phase transformation in La(CoxNi5−x)–H systems (x=2, 3, 5) studied by in situ X-ray diffraction

Nakamura, Yumiko; Nomiyama, Takahiro; Akiba, Etsuo

doi:10.1016/j.jallcom.2004.11.130

Cited by 15 publications

(11 citation statements)

References 20 publications

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“…This result is as expected and is in relative good agreement with the previous work of Nakamura et al [32]. In the a and b regions, the lattice parameter of a and b phases increases to about 5% (from 7.02 to 7.06 and from 7.21 to 7.25 Å for a and b phases, respectively).…”

Section: Article In Presssupporting

confidence: 93%

In situ X-ray diffraction under H2 of the pseudo-AB2 compounds: YNi3.5Al0.5Mg

Stan

Andronescu

Asano

et al. 2008

International Journal of Hydrogen Energy

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In situ XRD a b s t r a c tThe hydrogenation and dehydrogenation behaviours of the YNi 3.5 Al 0.5 Mg compound were studied by in situ X-ray diffraction under hydrogen pressure and at room temperature. The changes of (i) the lattice parameters, (ii) the crystallite size and (iii) the lattice strain during the sorption process (i.e. along the PC isotherms) were studied. These results indicate that the crystallite size decreases by a factor of 2. The micro deformations increase at first and then tend to almost zero at the end of the sorption cycle. This behaviour is explained in terms of co-existence of the metal (i.e. a phase) and metal hydride (i.e. b phase) phases. The change in crystallinity is consistent with the hydrogen induced amorphisation process existing in a lot of AB 2 compounds. No anisotropic effects can be highlighted on this pseudo-AB 2 compounds in contrary with what could be observed in AB 5 compounds.

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Section: Article In Presssupporting

confidence: 93%

In situ X-ray diffraction under H2 of the pseudo-AB2 compounds: YNi3.5Al0.5Mg

Stan

Andronescu

Asano

et al. 2008

International Journal of Hydrogen Energy

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“…Intermetallic compounds of the type RT 5 (R, rare earth element; T, transition metal) such as LaNi 5 and LaCo 5 , have been intensivelly studied for the purpose of hydrogen storage and energy conversion because of their favourable kinetic and thermodynamic properties for hydrogen absorption and desorption at ambient temperatures [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical hydrogenation and corrosion behaviour of LaCo_4.8M_0.2 alloys

Giza

Bala

Pavlyuk

2009

Materials & Corrosion

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Hydrogen absorption properties and the corrosion characteristics of three LaCo 4.8 M 0.2 alloys (where M antimony, magnesium or bismuth) have been investigated using electrochemical techniques. Absorption of hydrogen and corrosion behaviour of LaCo 4.8 M 0.2 alloys have been compared with LaCo 5 intermetallic compound. Typical potentiokinetic polarisation curves in 6 M potassium hydroxide solution showed that modification of LaCo 5 by partial substitution of antimony, magnesium or bismuth for cobalt resulted in lower anodic currents in the passive range. The substitution does not significantly affect the shape of potentiokinetic polarisation curves in 0.5 M sulphate solutions for pH 2 and 7. Partial substitution of cobalt with bismuth in LaCo 5 alloy increases the effectiveness of absorption of cathodically evolved hydrogen in strong alkaline solutions.

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“…1,3) In order to restrain these lattice volume expansion and lattice strain, the substitution of other elements for Ni in the B site has been carried out. For example, Co substitution restrains expansion of lattice volume, 4) and Al or Sn substituted alloys restrain introduction of lattice defect. [5][6][7] In this paper, we focus attention on the A site rare earth elements that consist of Mm.…”

Section: Introductionmentioning

confidence: 99%

Substitution Effect of Rare Earth on Hydrogenation for AB<SUB>5</SUB>-Type Alloys

Endo

Akiba

2006

Mater. Trans.

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Substitution effects of rare earth elements for hydrogenation of MmNi 3:55 Co 0:75 Al 0:30 Mn 0:40 AB 5 -type alloys were investigated, where Mm consisted of La-Pr-Nd-M (M : Ce, Y, Gd, Tm and Lu), and the amount of La and M was adjusted to keep the lattice volume identical which leads to a similar equilibrium hydrogen pressure. The above alloys showed two-phase reaction during hydrogenation, and both the phases had the orthorhombic lattice with a space group of Cmmm after activation. The Ce containing alloy showed a higher equilibrium hydrogen pressure (0.12 MPa) than the others (0.07-0.10 MPa) at 298 K. In addition, this alloy showed the largest lattice volume expansion among the alloys investigated. However, lattice strain of the hydride phases calculated from line broadening in X-ray diffraction peaks showed to be less than 0.9% for all the alloys investigated.

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Phase transformation in La(CoxNi5−x)–H systems (x=2, 3, 5) studied by in situ X-ray diffraction

Cited by 15 publications

References 20 publications

In situ X-ray diffraction under H2 of the pseudo-AB2 compounds: YNi3.5Al0.5Mg

In situ X-ray diffraction under H2 of the pseudo-AB2 compounds: YNi3.5Al0.5Mg

Electrochemical hydrogenation and corrosion behaviour of LaCo_4.8M_0.2 alloys

Substitution Effect of Rare Earth on Hydrogenation for AB<SUB>5</SUB>-Type Alloys

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Phase transformation in La(CoxNi5−x)–H systems (x=2, 3, 5) studied by in situ X-ray diffraction

Cited by 15 publications

References 20 publications

In situ X-ray diffraction under H2 of the pseudo-AB2 compounds: YNi3.5Al0.5Mg

In situ X-ray diffraction under H2 of the pseudo-AB2 compounds: YNi3.5Al0.5Mg

Electrochemical hydrogenation and corrosion behaviour of LaCo4.8M0.2 alloys

Substitution Effect of Rare Earth on Hydrogenation for AB<SUB>5</SUB>-Type Alloys

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Electrochemical hydrogenation and corrosion behaviour of LaCo_4.8M_0.2 alloys