Hydrogen absorption in CeNiAl: Formation of crystalline and amorphous hydride phases

Shashikala, K.; Sathyamoorthy, A.; Raj, P.; Yelon, W. B.; Malik, S.K.

doi:10.1016/j.jallcom.2006.07.118

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…In many other similar systems, insertion of hydrogen induces a change in the crystal structure. Such a symmetry transformation was observed for example in CeNiAl [4][5][6][7] that crystallizes in the ZrNiAl-type unit cell but its hydrides form with the AlB 2 -type structure (space group P6/mmm). Apparently, the tetrahedral interstices in the parent structure are too small to accommodate the hydrogen atoms and the structural transition occurs.…”

Section: Introductionmentioning

confidence: 84%

Influence of hydrogen absorption on structural and magnetic properties of Ce2Ni2In

Iwasieczko

Kaczorowski

2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 84%

Influence of hydrogen absorption on structural and magnetic properties of Ce2Ni2In

Iwasieczko

Kaczorowski

2010

Journal of Alloys and Compounds

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“…In this structure, Ce atoms occupy the 3f [18]. However, Shashikala et al also mentioned the additional sites 6k and 6i for deuterium atoms in the CeNiAlD3.2 deuteride crystallizing in the AlB2 type structure [19]. These tetrahedral interstices are formed by 2 atoms of Ce and 2 atoms of Ni/Zn and are filled with a lower occupancy than the 4h one.…”

Section: Structural Aspectsmentioning

confidence: 88%

Hydrogenation-induced cerium valence change in CeNiZn

Tencé

Heying

Janka

et al. 2017

Journal of Alloys and Compounds

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transition from a ZrNiAl-to an AlB2-type structure with a high volume cell expansion of +20.1 %. The magnetic, thermal and transport properties of CeNiZnH1.2(1) were investigated. Susceptibility and specific heat measurements do not reveal magnetic order down to 1.8 K but most likely the presence of ferromagnetic correlations due to the proximity of a ferromagnetic order or a nonmagnetic atom disorder spin-glass state. Moreover, the cerium valence is modified from an intermediate to a trivalent state, a change that results from the decrease of the hybridization strength between conduction and Ce(4f) electrons upon hydrogenation. Transport measurements also evidence a deviation from the typical resistivity behavior of metallic systems. Several scenarios are conceived to explain this change, in particular weak localization effect, knowing that it rarely occurs upon hydrogenation of intermetallics.

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“…The phase purity was checked by X-ray diffraction using Cu K␣ radiation. Hydrogen absorption was carried out following the procedure described in our earlier works [10,11]. Hydrogenation was performed at a temperature of 473 K and a maximum H 2 pressure of ∼2 MPa.…”

Section: Methodsmentioning

confidence: 99%