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Excellent magnetocaloric properties in RE 2 Cu 2 Cd ( RE   =   Dy and Tm) compounds and its composite materials

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ABSTRACT

The magnetic properties and magnetocaloric effect (MCE) of ternary intermetallic RE2Cu2Cd (RE = Dy and Tm) compounds and its composite materials have been investigated in detail. Both compounds undergo a paramagnetic to ferromagnetic transition at its own Curie temperatures of TC ~ 48.5 and 15 K for Dy2Cu2Cd and Tm2Cu2Cd, respectively, giving rise to the large reversible MCE. An additionally magnetic transition can be observed around 16 K for Dy2Cu2Cd compound. The maximum values of magnetic entropy change (−ΔSMmax) are estimated to be 17.0 and 20.8 J/kg K for Dy2Cu2Cd and Tm2Cu2Cd, for a magnetic field change of 0–70 kOe, respectively. A table-like MCE in a wide temperature range of 10–70 K and enhanced refrigerant capacity (RC) are achieved in the Dy2Cu2Cd - Tm2Cu2Cd composite materials. For a magnetic field change of 0–50 kOe, the maximum improvements of RC reach 32% and 153%, in comparison with that of individual compound Dy2Cu2Cd and Tm2Cu2Cd. The excellent MCE properties suggest the RE2Cu2Cd (RE = Dy and Tm) and its composite materials could be expected to have effective applications for low temperature magnetic refrigeration.

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Related in: MedlinePlus

Temperature dependence of magnetic entropy change −ΔScomp for the 0.77 Dy2Cu2Cd - 0.23 Tm2Cu2Cd composite material for the magnetic field change of 0–50 kOe.
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f9: Temperature dependence of magnetic entropy change −ΔScomp for the 0.77 Dy2Cu2Cd - 0.23 Tm2Cu2Cd composite material for the magnetic field change of 0–50 kOe.

Mentions: where x and 1 − x are the weight amounts of Dy2Cu2Cd and Tm2Cu2Cd, respectively. Based on both compounds, a composite material can be formed and the optimum ratio of x ~ 0.77 is determined by using a numerical method. The magnetic entropy change ΔScomp(T) for Dy2Cu2Cd - Tm2Cu2Cd composite material at x ~ 0.77 under a magnetic field change of 0–50 kOe is shown in Fig. 9. A table-like MCE in a wide temperature span of 10–70 K can be observed in ΔScomp(T) curve which is desirable for an ideal Ericsson-cycle magnetic refrigeration. The corresponding maximum value of RCcomp is 417 J/kg, which is 32% and 153% higher than those of Dy2Cu2Cd (316 J/kg) or Tm2Cu2Cd (165 J/kg). The transition temperature TC, the maximum values of −ΔSMmax and RC under the magnetic field change of 0–50 kOe for Dy2Cu2Cd and Tm2Cu2Cd as well as the 0.77 Dy2Cu2Cd - 0.23 Tm2Cu2Cd composite material together with some MCE materials in the similar working temperature range are listed in Table 1 for comparison. The MCE parameters for the present studied materials are comparable or larger than those of other potential magnetic refrigerant materials in the similar temperature region, suggesting RE2Cu2Cd composite materials could be a promising candidate for magnetic refrigeration for Ericsson cycle in the temperature range of 10–70 K. The present results allow for the possibility of using RE2Cu2Cd compounds to fabricate composite materials with desirable magnetocaloric properties for active magnetic refrigeration.


Excellent magnetocaloric properties in RE 2 Cu 2 Cd ( RE   =   Dy and Tm) compounds and its composite materials
Temperature dependence of magnetic entropy change −ΔScomp for the 0.77 Dy2Cu2Cd - 0.23 Tm2Cu2Cd composite material for the magnetic field change of 0–50 kOe.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5035927&req=5

f9: Temperature dependence of magnetic entropy change −ΔScomp for the 0.77 Dy2Cu2Cd - 0.23 Tm2Cu2Cd composite material for the magnetic field change of 0–50 kOe.
Mentions: where x and 1 − x are the weight amounts of Dy2Cu2Cd and Tm2Cu2Cd, respectively. Based on both compounds, a composite material can be formed and the optimum ratio of x ~ 0.77 is determined by using a numerical method. The magnetic entropy change ΔScomp(T) for Dy2Cu2Cd - Tm2Cu2Cd composite material at x ~ 0.77 under a magnetic field change of 0–50 kOe is shown in Fig. 9. A table-like MCE in a wide temperature span of 10–70 K can be observed in ΔScomp(T) curve which is desirable for an ideal Ericsson-cycle magnetic refrigeration. The corresponding maximum value of RCcomp is 417 J/kg, which is 32% and 153% higher than those of Dy2Cu2Cd (316 J/kg) or Tm2Cu2Cd (165 J/kg). The transition temperature TC, the maximum values of −ΔSMmax and RC under the magnetic field change of 0–50 kOe for Dy2Cu2Cd and Tm2Cu2Cd as well as the 0.77 Dy2Cu2Cd - 0.23 Tm2Cu2Cd composite material together with some MCE materials in the similar working temperature range are listed in Table 1 for comparison. The MCE parameters for the present studied materials are comparable or larger than those of other potential magnetic refrigerant materials in the similar temperature region, suggesting RE2Cu2Cd composite materials could be a promising candidate for magnetic refrigeration for Ericsson cycle in the temperature range of 10–70 K. The present results allow for the possibility of using RE2Cu2Cd compounds to fabricate composite materials with desirable magnetocaloric properties for active magnetic refrigeration.

View Article: PubMed Central - PubMed

ABSTRACT

The magnetic properties and magnetocaloric effect (MCE) of ternary intermetallic RE2Cu2Cd (RE = Dy and Tm) compounds and its composite materials have been investigated in detail. Both compounds undergo a paramagnetic to ferromagnetic transition at its own Curie temperatures of TC ~ 48.5 and 15 K for Dy2Cu2Cd and Tm2Cu2Cd, respectively, giving rise to the large reversible MCE. An additionally magnetic transition can be observed around 16 K for Dy2Cu2Cd compound. The maximum values of magnetic entropy change (−ΔSMmax) are estimated to be 17.0 and 20.8 J/kg K for Dy2Cu2Cd and Tm2Cu2Cd, for a magnetic field change of 0–70 kOe, respectively. A table-like MCE in a wide temperature range of 10–70 K and enhanced refrigerant capacity (RC) are achieved in the Dy2Cu2Cd - Tm2Cu2Cd composite materials. For a magnetic field change of 0–50 kOe, the maximum improvements of RC reach 32% and 153%, in comparison with that of individual compound Dy2Cu2Cd and Tm2Cu2Cd. The excellent MCE properties suggest the RE2Cu2Cd (RE = Dy and Tm) and its composite materials could be expected to have effective applications for low temperature magnetic refrigeration.

No MeSH data available.


Related in: MedlinePlus