On the verge of short D–D distances in RNiIn deuterides

Gondek, Ł.; Koźlak, K.; Czub, J.; Rusinek, D.; Szytuła, A.; Hoser, A.

doi:10.1016/j.intermet.2012.11.002

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…These reports [490,491,492,493,494,495] show that the crystal structure of compounds is unchanged on hydrogenation, while there is an expansion of unit cell on hydrogenation. It was seen that the [494].…”

Section: Hydrogenation Of Rtx Compoundsmentioning

confidence: 99%

See 1 more Smart Citation

Review on magnetic and related properties of RTX compounds

Gupta

Суреш

2015

Journal of Alloys and Compounds

261

124

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RTX (R=rare earths, T= 3d/4d/5d, transition metals such as Sc, Ti, Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Os, Ir, Pt, Au, and X=p-block elements such as Al, Ga, In, Si, Ge, Sn, As, Sb, Bi) series is a huge family of intermetallics compounds. These compounds crystallize in different crystal structures depending on the constituents. Though these compounds have been known for a long time, they came to limelight recently in view of the large magnetocaloric effect (MCE) and magnetoresistance (MR) shown by many of them. Most of these compounds crystallize in hexagonal and tetragonal crystal structures. Some of them show crystal structure modification with annealing temperature; while a few of them show iso-structural transition in the paramagnetic regime. Their magnetic ordering temperatures vary from very low temperatures to temperatures well above room temperature (~510 K). Depending on the crystal structure, they show a variety of magnetic and electrical properties.These compounds have been characterized by means of a variety of techniques/measurements such as x-ray diffraction, neutron diffraction, magnetic properties, heat capacity, magnetocaloric properties, electrical resistivity, magnetoresistance, thermoelectric power, thermal expansion, Hall effect, optical properties, XPS, Mössbauer spectroscopy, ESR, μSR, NMR, NQR etc. Some amount of work on theoretical calculations on electronic structure, crystal field interaction and exchange interactions has also been reported. The interesting aspect of this series is that they show a variety of physical properties such as Kondo effect, heavy fermion behavior, spin glass state, intermediate valence, superconductivity, multiple magnetic transitions, metamagnetism, large MCE, large positive as well as negative MR, spin orbital compensation, magnetic polaronic behavior, pseudo gap effect etc.Except Mn, no other transition metal in these compounds possesses considerable magnetic moments.Because of this RMnX compounds in general have high ordering temperatures. Interstitial modification using hydrogen and nitrogen is found to alter their crystal structures and magnetic properties considerably. RTX compounds also show interesting pressure effects on their structural and magnetic properties. In summary, these compounds show variety of physical properties over a wide range of temperatures. This review is intended to cover all the important results obtained in this family, particularly in the last few years.

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Section: Hydrogenation Of Rtx Compoundsmentioning

confidence: 99%

“…There are many reports on the hydrogenation of RNiIn compounds. These reports [490,491,492,493,494,495] show that the crystal structure of compounds is unchanged on hydrogenation, while there is an expansion of unit cell on hydrogenation. It was seen that the hydrogenated CeNiIn shows FM behavior below TC= 6. )…”

Section: Hydrogenation Of Rtx Compoundsmentioning

confidence: 99%

Review on magnetic and related properties of RTX compounds

Gupta

Суреш

2015

Journal of Alloys and Compounds

261

124

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“…Very few known compounds to date have displayed unambiguous H•••H contacts closer than 2 Å. These include Th 2 AlH x [17][18][19][20] and a series of RNiInH x hydrides (R = La, Ce, Nd, Pr) [21][22][23][24][25][26][27]. The RNiInH x (0 < x < ~1.6) compounds crystallize in the hexagonal P62m space group (hexagonal ZrNiAl structure type) with hydrogen (deuterium) atoms preferentially filling the R 3 Ni tetrahedra (4 h crystallographic sites) below x ≈ 1.33.…”

Section: ]] ]] ]]]]]]mentioning

confidence: 99%

Neutron Vibrational Spectroscopic Evidence for Short H···H Contacts in the RNiInH_1.4;1.6 (R = Ce, La) Metal Hydride

Klein

Balderas‐Xicohténcatl

Mæhlen

et al. 2022

Neutron News

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Intermetallic metal hydrides are critical materials for hydrogen storage applications, however, metal hydrides with greater storage capacities are still needed. Within metal hydrides, the volumetric storage capacities are limited by the number of hydrogen-accommodating interstitial sites which can be simultaneously occupied given a minimum hydride nearest-neighbor distance of ≈ 2.1 Å, according to the Switendick-Westlake criterion. To date, violations of this criterion are rare. Perhaps the most well studied compounds violating this criterion are the RNiInH x compounds (R = Ce, La, Nd). Previous neutron diffraction studies on the deuterated species revealed the presence of Ni-DYet there are no neutron vibrational spectroscopic investigations reported for these atypical hydrides. Here we use neutron vibrational spectroscopy (NVS) measurements to probe the hydrogen dynamics in LaNiInH x (x = 0.67, 1.6) and CeNiInH 1.4 . For x > 0.67, the presence of close H•••H contacts yields two related features in the vibrational spectrum centered near ≈ 90 meV corresponding to the oscillations of paired H atoms simultaneously occupying neighboring R 3 Ni tetrahedra. Notably, these features are energetically distinct from comparable vibrational motions for "unpaired" H atoms when x ≤ 0.67. To compare, we also present powder neutron diffraction and NVS measurements for the newly characterized, chemically similar Sn compounds CeNiSnH, CeNiSnH 2 , and CeNiSnD 2 . These compounds also contain R 3 Ni tetrahedra, however, the H-occupied tetrahedra are well separated from each other with the closest H•••H distances exceeding 2.1 Å, and the Switendick-Westlake criterion is not violated. Consequently, the spectral signature of the close H•••H contacts is absent in these hydrides.

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