Susceptibility of the rare earth ternary equiatomic germanides RNiGe (R ≡ Gd, Tb, Dy, Ho, Er, Tm and Y)

Kotsanidis, P.A.; Yakinthos, J.K.; Gamari‐Seale, E.

doi:10.1016/0022-5088(90)90184-l

Cited by 13 publications

(14 citation statements)

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“…Neutron diffraction and magnetization measurements [214,215,216] on RNiGe (R=Gd-Tm) show that these compounds order antiferromagnetically at low temperatures. The magnetic structure in TbNiGe and DyNiGe can be described by square modulated at low temperature, which changes to sine modulated for TbNiGe and cycloidal spiral for DyNiGe compound with moments parallel to c-axis [215].…”

Section: Rnix Compoundsmentioning

confidence: 97%

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: Rnix Compoundsmentioning

confidence: 97%

Review on magnetic and related properties of RTX compounds

Gupta

Суреш

2015

Journal of Alloys and Compounds

262

124

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“…The calculated lattice parameters ( a , b , and c ) and the cell volumes ( V ) are reported in Table along with the experimental values for comparison.…”

Section: Resultsmentioning

confidence: 99%

“…The ternary compounds: scandium (IIIB group element) and 3d/4d/5d transition‐metal silicides, i.e., ScTSi (T═Co, Ni, Cu (3d), Ru, Rh, Pd (4d), Ir, Pt (5d) from VIIIB group) and the equiatomic tetrelides YTX (Y being the yttrium, T═Ni, Ir; X═Si, Ge, Sn, Pb from IVA group) crystallize in the orthorhombic TiNiSi‐type crystal structure (space group Pnma, Z = 4) . The incorporation of the transition metals and of p‐block elements such as Si modifies the magnetic interactions between the rare‐earth atoms in ScTSi compounds leading to a large variability of their interesting physical properties such as magnetocaloric effects and magnetoresistance.…”

Section: Introductionmentioning

confidence: 99%

Structural and elastic properties of ternary silicides ScTSi (T═Co, Ni, Cu, Ru, Rh, Pd, Ir, Pt) and of the equiatomic intermetallic compounds YTX (T═Ni, Ir and X═Si, Ge, Sn, Pb)

Sebehi

Bouamama

Djémia

et al. 2015

Physica Status Solidi (b)

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The structural and elastic properties of the ternary silicides ScTSi (T═Co, Ni, Cu, Ru, Rh, Pd, Ir, Pt) and of the equiatomic intermetallic YTX (T═Ni, Ir; X═Si, Ge, Sn, Pb) are studied using the density-functional theory considering the orthorhombic TiNiSi crystal structure with space group Pnma. From the calculated formation energy, we obtained the following stability order of: ScCuSi < ScCoSi < ScRuSi < ScNiSi < ScPdSi < ScRhSi < ScIrSi < ScPtSi and YNiPb < YNiSn < YNiGe < YNiSi < YIrSn < YIrGe < YIrPb < YIrSi. The lattice parameters and atomic positions are in good agreement with experiments to $1%. All the alloys are mechanically stable using the Born elastic stability criteria. Ductile behavior inferred from the Pugh ratio, shear over bulk modulus G/B, and the Cauchy pressure, could be observed only for ScTSi (TÀ À À ÀRu, Pd, Pt) and YNiSn compounds and moderately for YIrX (Si, Ge, and Sn) and YNiPb. On the contrary, ScTSi (TÀ À À ÀCo, Ni, Cu, Rh, Ir), YNiGe, and YNiSi compounds are covalent or exhibit G/B > 0.5, leading to a brittle behavior in accordance with the Poisson ratio value. The Zener anisotropy factor is different from 1, indicating that these compounds are elastically anisotropic materials. A strong correlation is found between G and the Young's modulus E, slightly above G $(3/8)E widely found for polycrystalline metals.Correlation trend between the Young's modulus E and the shear modulus G of intermetallic compounds.1 Introduction The ternary compounds: scandium (IIIB group element) and 3d/4d/5d transition-metal silicides, i.e., ScTSi (T═Co, Ni, Cu (3d), Ru, Rh, Pd (4d), Ir, Pt (5d) from VIIIB group) and the equiatomic tetrelides YTX (Y being the yttrium, T═Ni, Ir; X═Si, Ge, Sn, Pb from IVA group) crystallize in the orthorhombic TiNiSi-type crystal structure (space group Pnma, Z ¼ 4) [1][2][3][4][5][6][7][8][9][10][11][12]. The incorporation of the transition metals and of p-block elements such as Si [13] modifies the magnetic interactions between the rare-earth atoms in ScTSi compounds leading to a large variability of their interesting physical properties such as magnetocaloric effects and magnetoresistance. In the field of magnetic materials research, rare-earthtransition-metal intermetallic compounds have always

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“…The GdNiGe compound crystallizes in the hexagonal TiNiSi-type Pnma structure (space group 62) with 4 formula units (12 atoms) in the unit cell with lattice parameters a = 4.310 Å, b = 6.935 Å, and c = 7.315 Å [4]. The atomic positions are presented in Table 1.…”

Section: Crystal Structurementioning

confidence: 99%

“…The atomic positions are presented in Table 1. Gadolinium ions occupy 4c positions (0.0212, 0.25, 0.6803), nickel ions are also in 4c positions (0.142, 0.25, 0.0609), and germanium ions are in 4c positions with the coordinates (0.2651, 0.25, 0.3771) [4]. In the calculations, we used the experimental values of the atomic positions and obtained the calculated equilibrium volume with the fixed c/a ratio and all angles in GdNiGe.…”

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confidence: 99%

Electronic Structure of Intermetallic Antiferromagnet GdNiGe

Baglasov

Lukoyanov

2019

Symmetry

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The electronic structure of the GdNiGe ternary intermetallic compound was investigated in this work. We carried out the spin-polarized DFT+U calculations of its band structure within generalized gradient approximation accounting for strong electronic correlations in the 4f-shell of gadolinium ions. The antiferromagnetic ordering was reproduced in the calculations, in agreement with experimental data. The calculated equilibrium volume is within 2% accuracy to the experimental crystal structure data, which demonstrates the reliability of the method chosen. The 4f-shell of Gd was demonstrated to substantially contribute to the spectral and magnetic properties of the GdNiGe compounds, whereas other ions were found nonmagnetic, in agreement with experimental data.

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Susceptibility of the rare earth ternary equiatomic germanides RNiGe (R ≡ Gd, Tb, Dy, Ho, Er, Tm and Y)

Cited by 13 publications

References 1 publication

Review on magnetic and related properties of RTX compounds

Review on magnetic and related properties of RTX compounds

Structural and elastic properties of ternary silicides ScTSi (T═Co, Ni, Cu, Ru, Rh, Pd, Ir, Pt) and of the equiatomic intermetallic compounds YTX (T═Ni, Ir and X═Si, Ge, Sn, Pb)

Electronic Structure of Intermetallic Antiferromagnet GdNiGe

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