Magnetic properties and crystal structure of HoNiAl and UNiAl hydrides

Kolomiets, A.; Havela, L.; Rafaja, David; Bordallo, Heloisa N.; Nakotte, H.; Yartys, V.A.; Hauback, Bjørn C.; Drulis, H.; Iwasieczko, W.; DeLong, L. E.

doi:10.1063/1.372851

Cited by 22 publications

(24 citation statements)

References 11 publications

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“…Hydrogen insertion in HoNiAl is found to change its crystal structure from hexagonal to orthorhombic [489]. Hydrogenated HoNiAl shows very different properties compared to those of the parent compound.…”

Section: Hydrogenation Of Rtx Compoundsmentioning

confidence: 99%

Review on magnetic and related properties of RTX compounds

Gupta

Суреш

2015

Journal of Alloys and Compounds

262

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%

Review on magnetic and related properties of RTX compounds

Gupta

Суреш

2015

Journal of Alloys and Compounds

262

124

View full text Add to dashboard Cite

show abstract

“…Hydrogen absorption can take place at room temperature under H 2 (D 2 ) pressure of about 1 bar [2][3][4][5][6]. Previous studies of RENiAl have shown that both magnetic and structural properties are modified by hydrogenation [4,[7][8][9]. In most cases, the maximum hydrogen (deuterium) uptake reaches 1.0-1.4 atoms per formula unit and leads to an orthorhombic distortion of the original hexagonal structure (space group Amm2; a ∼ c hex ; b ∼ a hex √ 3; c ∼ a hex ) accompanied by a relative increase of cell volume, V/V ≤ 7% (RE = Y, Gd, Tb, Dy, Ho and Er) [4].…”

Section: Introductionmentioning

confidence: 99%

Crystal structure and thermal desorption properties of HoNiAlD1.2

Stange

Kolomiets

Yartys

et al. 2004

Journal of Alloys and Compounds

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“…It may be noted that isostructural UNiAl forms hydride/deuteride with y w 2.2, indicating that the type of interstitial sites [20] and Bordallo et al [21] who reported the occupancy of 3Al þ 2Ni, which seems quite unlikely. Comparing with other UTX compounds, in URuSnD 0.6 [10] the D atoms occupy the trigonal bipyramidal sites formed by 3U þ 2Ru, similar to one of the sites in UNiAlD 2.2 .…”

Section: 2mentioning

confidence: 95%