Specific Heat and Magnetocaloric Effect in Ho-Er-Co Solid Solutions

Ćwik, J.; Palewski, Т.; Nenkov, K.

doi:10.1007/s10948-012-1708-9

Cited by 10 publications

(2 citation statements)

References 14 publications

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“…On the other hand, the peak at T c spreads to a broad anomaly with a much lower magnitude when a field larger than 1 T is applied, and it almost disappears under a field of 5 T, which may be attributed to the ordering of RE ions as commonly observed in conventional ferromagnetic materials [38]. It is well known that in RECo 2 compounds, the total C p (T) is determined by the sum of three contributions-electron C el , phonon C ph (T) and magnetic contributions C mag (T) [39], those can be expressed as…”

Section: Temperature-dependent Resistivity (ρ) and Heat Capacity (C P )mentioning

confidence: 95%

Magnetocaloric effect and critical exponent analysis around magnetic phase transition in NdCo₂ compound

Murtaza

Zuo

et al. 2020

J. Phys. D: Appl. Phys.

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The magnetic properties and magnetocaloric effect of ferromagnetic NdCo 2 compound have been investigated around the magnetic phase transition using magnetic and heat capacity measurements. The thermomagnetic irreversibility between the zero field-cooled and field-cooled magnetization curves is detected below Curie temperature in the low magnetic field, and it is attributed to the domain wall pinning effect. The maximum magnetic entropy change (∆S M ) of 7.33 Jkg −1 K −1 and large relative cooling capacity of 529.96 Jkg −1 was obtained over the wide working temperature range of 78 K under magnetic field change of 5 T. The corresponding maximum adiabatic temperature change (∆T ad ) is evaluated to be 3.1 K under a same magnetic field change. Meanwhile, negligible thermal and magnetic hysteresis loss was observed in paramagnetic (PM) to ferromagnetic (FM) transition region. Such a magnetocaloric effect is attributed to a second-order magnetostructural transition from a PM cubic phase to a FM tetragonal phase around the Curie temperature of T c ≈ 102 K. The observed magnetocaloric performance is comparable or even better than some earlier reported rare-earth based Laves compounds under the same magnetic field change, implying that the NdCo 2 is one of the potential refrigerant material working at low temperature. The critical exponent analysis was carried out to understand the nature and underlying mechanism of the PM to FM phase transition. The critical exponents (β, γ) obtained from modified Arrott plots, the Kouvel-Fisher plot, and the critical isotherm are consistent with each other and obey the Widom scaling relation (δ = 1+γ/β). The values of critical exponents suggest that the NdCo 2 belongs to the three-dimensional-Ising model with short-range interaction. The present results may give some clues for searching novel materials with excellent magnetocaloric performance for refrigeration technology.

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Section: Temperature-dependent Resistivity (ρ) and Heat Capacity (C P )mentioning

confidence: 95%

Magnetocaloric effect and critical exponent analysis around magnetic phase transition in NdCo₂ compound

Murtaza

Zuo

et al. 2020

J. Phys. D: Appl. Phys.

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“…The magnetic part of the entropy (S m ) was calculated by a same method suggested in reference [30] using function of integrating C m /T temperature dependence, where C m = C p − C l . For LiNi 0.5 Co 0.5 PO 4 the magnetic entropy reach the maximum values 7.4 J mol −1 K in the temperature ∼50 K.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Models of Ni- and Co-ion occupation in LiNi_0.5Co_0.5PO₄ orthophosphate and its magnetic structure

Semkin¹,

Urusova²,

Hoser³

et al. 2022

J. Phys.: Condens. Matter

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The neutron diffraction, magnetic and heat capacity measurements have been carried out to study the polycrystalline sample LiNi0.5Co0.5PO4 prepared by the glycerol-nitrate synthesis method. Models of Ni- and Co-ion occupation the 4с octahedral position in a crystal structure LiNi0.5Co0.5PO4 are calculated for a paramagnetic state. The best model is the Ni- and Co-ions occupy the 4с site in Pnma patent space-group in sequence Ni-Co-Ni-Co or Co-Ni-Co-Ni. It is shown that nickel ions form ab planes alternating with the planes of cobalt ions in the direction of the c crystallographic axis. At 7 K, An average magnetic moment of 3d-ions is equal to 1.90 (9) μB. The moments are ordering antiferromagnetically and parrallel to the bc plane decreasing to zero at 15 K. In the high-spin state a temperature dependence of the Ni2+/Co2+ ion-magnetic moment is well described within the 2D Ising model with order parameter β = 0.198 and Néel temperature T N = 14.1 (1) K, obtained from heat capacity data. This temperature agrees well with T cr = 14.3 (2) K, determined with magnetic measurement. Maybe the short-range magnetic order exists in LiNi0.5Co0.5PO4 over temperatre region (14–16) K, that is confirmed by the maximum on a temperature dependence of the magnetization at 16.1 (5) K.

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Structural, Magnetic, and Electrical Properties of a Composition of (La/Ce)-Cu-Al Phase

Kurawle

Borole

Морозкин

et al. 2023

J Supercond Nov Magn

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Specific Heat and Magnetocaloric Effect in Ho-Er-Co Solid Solutions

Cited by 10 publications

References 14 publications

Magnetocaloric effect and critical exponent analysis around magnetic phase transition in NdCo₂ compound

Magnetocaloric effect and critical exponent analysis around magnetic phase transition in NdCo₂ compound

Models of Ni- and Co-ion occupation in LiNi_0.5Co_0.5PO₄ orthophosphate and its magnetic structure

Structural, Magnetic, and Electrical Properties of a Composition of (La/Ce)-Cu-Al Phase

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Specific Heat and Magnetocaloric Effect in Ho-Er-Co Solid Solutions

Cited by 10 publications

References 14 publications

Magnetocaloric effect and critical exponent analysis around magnetic phase transition in NdCo2 compound

Magnetocaloric effect and critical exponent analysis around magnetic phase transition in NdCo2 compound

Models of Ni- and Co-ion occupation in LiNi0.5Co0.5PO4 orthophosphate and its magnetic structure

Structural, Magnetic, and Electrical Properties of a Composition of (La/Ce)-Cu-Al Phase

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Product

Resources

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Magnetocaloric effect and critical exponent analysis around magnetic phase transition in NdCo₂ compound

Magnetocaloric effect and critical exponent analysis around magnetic phase transition in NdCo₂ compound

Models of Ni- and Co-ion occupation in LiNi_0.5Co_0.5PO₄ orthophosphate and its magnetic structure