Crystallographic, electronic structure and magnetic properties of the GdTAl; T=Co, Ni and Cu ternary compounds

Jarosz, J.; Talik, E.; Mydlarz, T.; Kusz, Joachim; Böhm, Horst; Winiarski, A.

doi:10.1016/s0304-8853(99)00592-2

Cited by 59 publications

(44 citation statements)

References 19 publications

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“…From the M-T curves, Gd 55 Ni 17 Al 26 Zr 2 BMG shows ferromagnetic behavior and undergoes phase transition near 70 K. That of crystalline GdNiAl phase, as shown in Fig. 2 phase transitions with the first occurring near 30 K. Its transition temperature, T C is 67 K. The T C of GdNiAl reported in literature ranges from 58 to 70 K. [19][20][21] Previous research 22 indicates that the substitution between Ni and Al can change the transition temperature of intermetallic phase GdNiAl. The higher the concentration of Ni in the phase, the higher is the transition temperature.…”

Section: Resultsmentioning

confidence: 98%

Table-like magnetocaloric effect in Gd56Ni15Al27Zr2 alloy and its field independence feature

Balfour

et al. 2015

Journal of Applied Physics

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In order to obtain "table-like" magnetocaloric effect (MCE), multiple-phase Gd56Ni15Al27Zr2 alloy was prepared by arc-melting followed by suck-casting method. Powder x-ray diffraction and calorimetric measurements reveal that the sample contains both glassy and crystalline phases. The fraction of the glassy phase is about 62%, estimated from the heat enthalpy of the crystallization. The crystalline phases, Gd2Al and GdNiAl further broadened the relatively wider magnetic entropy change (−ΔSM) peak of the amorphous phase, which resulted in the table-like MCE over a maximum temperature range of 52.5 K to 77.5 K. The plateau feature of the MCE was found to be nearly independent of the applied magnetic field from 3 T to 5 T. The maximum −ΔSMvalue of the MCE platforms is 6.0 J/kg K under applied magnetic field change of 5 T. Below 3 T, the field independence of the In order to obtain "table-like" magnetocaloric effect (MCE), multiple-phase Gd 56 Ni 15 Al 27 Zr 2 alloy was prepared by arc-melting followed by suck-casting method. Powder x-ray diffraction and calorimetric measurements reveal that the sample contains both glassy and crystalline phases. The fraction of the glassy phase is about 62%, estimated from the heat enthalpy of the crystallization. The crystalline phases, Gd 2 Al and GdNiAl further broadened the relatively wider magnetic entropy change (ÀDS M ) peak of the amorphous phase, which resulted in the table-like MCE over a maximum temperature range of 52.5 K to 77.5 K. The plateau feature of the MCE was found to be nearly independent of the applied magnetic field from 3 T to 5 T. The maximum ÀDS M value of the MCE platforms is 6.0 J/kg K under applied magnetic field change of 5 T. Below 3 T, the field independence of the

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Section: Resultsmentioning

confidence: 98%

Table-like magnetocaloric effect in Gd56Ni15Al27Zr2 alloy and its field independence feature

Balfour

et al. 2015

Journal of Applied Physics

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“…The spin polarized calculations for GdMnGe show that Mn and Gd d bands are strongly polarized and reveal a moment of 3.22 μB on Mn, which is directed in opposite direction with that of Gd [519]. The XPS studies in the case of GdCoAl, GdNiAl and GdCuAl reveal that d electrons in GdCoAl and GdNiAl contribute to the density of states (DOS) at the Fermi energy, while in GdCuAl the main contribution is related to s and p electrons of Al and to the 5d electrons of Gd [35]. The contribution of DOS at Fermi level decreases when one goes from Ni to Cu [35].…”

Section: Electronic Structure Calculations and Electron Spectroscopymentioning

confidence: 99%

“…The XPS studies in the case of GdCoAl, GdNiAl and GdCuAl reveal that d electrons in GdCoAl and GdNiAl contribute to the density of states (DOS) at the Fermi energy, while in GdCuAl the main contribution is related to s and p electrons of Al and to the 5d electrons of Gd [35]. The contribution of DOS at Fermi level decreases when one goes from Ni to Cu [35].…”

Section: Electronic Structure Calculations and Electron Spectroscopymentioning

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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“…Among the RTX compounds, the RCoAl were found to crystallize in the more densely packed hexagonal Laves phase MgZn 2 -type structure [19]. RCoAl compounds have been reported to show anisotropic lattice expansion/contraction as a function of temperature which could affect their magnetic and transport properties [20]. Magnetic and magnetocaloric properties of RCoAl (R ¼ Gd, Tb, Dy and Ho) have been studied.…”

Section: Introductionmentioning

confidence: 98%

Magnetic property and magnetocaloric effect in TmCoAl compound

Shen

et al. 2015

Intermetallics

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Crystallographic, electronic structure and magnetic properties of the GdTAl; T=Co, Ni and Cu ternary compounds

Cited by 59 publications

References 19 publications

Table-like magnetocaloric effect in Gd56Ni15Al27Zr2 alloy and its field independence feature

Table-like magnetocaloric effect in Gd56Ni15Al27Zr2 alloy and its field independence feature

Review on magnetic and related properties of RTX compounds

Magnetic property and magnetocaloric effect in TmCoAl compound

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