The normal and inverse magnetocaloric effect in RCu2 (R=Tb, Dy, Ho, Er) compounds

Zheng, Xinliang; Xu, Zhi; Zhang, B.; Hu, Fengxia; Shen, Baogen

doi:10.1016/j.jmmm.2016.08.048

Cited by 34 publications

(10 citation statements)

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“…[97,141] In this work, the RCu 2 (R = Gd, Tb, Dy, Ho, Er) compounds were synthesized successfully. [142] The magnetic properties and magnetocaloric effect were investigated in detail. Though the MCEs of DyCu 2 and HoCu 2 compounds have been studied, the two compounds are still fabricated and investigated newly.…”

Section: The Magnetocaloric Effect Of R R Rni Compoundsmentioning

confidence: 99%

“…That is to say, almost all the obtained RCu 2 (R = Gd, Tb, Dy, Ho, Er) compounds are pure single phase. [142] The lattice parameters were determined by using Rietveld refinement method. For example, the lattice constant of HoCu 2 compound is calculated as follows: a = 4.2865(3) Å, b = 6.7766(6) Å, and c = 7.2754(6) Å.…”

Section: The Magnetocaloric Effect Of R R Rni Compoundsmentioning

confidence: 99%

“…The temperature dependences of zero-field-cooled (ZFC) and field-cooled (FC) magnetization were measured under a field of 0.02 T for the RCu 2 (R = Gd, Tb, Dy, Ho, Er) compounds. [142] And the ZFC and FC curves are shown in Fig. 58.…”

Section: The Magnetocaloric Effect Of R R Rni Compoundsmentioning

confidence: 99%

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The magnetic properties and magnetocaloric effects in binaryR–T(R= Pr, Gd, Tb, Dy, Ho, Er, Tm;T= Ga, Ni, Co, Cu) intermetallic compounds

Zheng

Shen

2017

Chinese Phys. B

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In this paper, we review the magnetic properties and magnetocaloric effects (MCE) of binary R-T (R = Pr, Gd, Tb, Dy, Ho, Er, Tm; T = Ga, Ni, Co, Cu) intermetallic compounds (including RGa series, RNi series, R 12 Co 7 series, R 3 Co series and RCu 2 series), which have been investigated in detail in the past several years. The R-T compounds are studied by means of magnetic measurements, heat capacity measurements, magnetoresistance measurements and neutron powder diffraction measurements. The R-T compounds show complex magnetic transitions and interesting magnetic properties. The types of magnetic transitions are investigated and confirmed in detail by multiple approaches. Especially, most of the R-T compounds undergo more than one magnetic transition, which has significant impact on the magnetocaloric effect of R-T compounds. The MCE of R-T compounds are calculated by different ways and the special shapes of MCE peaks for different compounds are investigated and discussed in detail. To improve the MCE performance of R-T compounds, atoms with large spin (S) and atoms with large total angular momentum (J) are introduced to substitute the related rare earth atoms. With the atom substitution, the maximum of magnetic entropy change (∆S M ), refrigerant temperature width (T width ) or refrigerant capacity (RC) is enlarged for some R-T compounds. In the low temperature range, binary R-T (R = Pr, Gd, Tb, Dy, Ho, Er, Tm; T = Ga, Ni, Co, Cu) intermetallic compounds (including RGa series, RNi series, R 12 Co 7 series, R 3 Co series and RCu 2 series) show excellent performance of MCE, indicating the potential application for gas liquefaction in the future.

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Section: The Magnetocaloric Effect Of R R Rni Compoundsmentioning

confidence: 99%

Section: The Magnetocaloric Effect Of R R Rni Compoundsmentioning

confidence: 99%

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The magnetic properties and magnetocaloric effects in binaryR–T(R= Pr, Gd, Tb, Dy, Ho, Er, Tm;T= Ga, Ni, Co, Cu) intermetallic compounds

Zheng

Shen

2017

Chinese Phys. B

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“…On the other hand, the MCE is based on the changes of adiabatic temperature and isothermal magnetic entropy in materials when an external magnetic field is applied. Materials which are mostly based on rare earths and have high a MCE are environmentally friendly and cost-effective and can be used in cooling technology. − The normal or conventional MCE (CMCE) concerns the decrease in magnetic entropy caused by adiabatic demagnetization when a material is exposed to a magnetic field. Inverse magnetic configurational entropy (IMCE) is another possibility when a material is exposed to magnetic fields which are cooled by adiabatic magnetization.…”

Section: Introductionmentioning

confidence: 99%

Segmented Highly Reversible Thermochromic Layered Perovskite [(CH₂)₂(NH₃)₂]CuCl₄ Crystal Coupled with an Inverse Magnetocaloric Effect

Dutta

Som

et al. 2022

ACS Appl. Electron. Mater.

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The layered, lead-free hybrid perovskites are superior in organic electronics compared to their three-dimensional (3D) counterparts due to their facile synthesis and promising stability to various environmental conditions. To learn more about the multifunctional side of such materials, a layered perovskite (EDA)CuCl4 [EDA is (CH2)2(NH3)2] crystal was grown in solution and crystallographically characterized by single-crystal X-ray diffraction. The crystal is thermally very stable and exhibits a high reversible thermochromic working temperature (∼503 K), intense conductivity changes with temperature, and strong exotic magnetic properties. The structural changes of the crystal with temperature are monitored and explained by powder X-ray diffraction and UV–vis absorption. The absorption band of the crystal shows little variation after repeated heating/cooling cycles, indicating admirable stability. Moreover, the Cu hybrid consists of a strong ferromagnetic interaction in antiferromagnetically coupled layers with a Néel temperature of about 34 K. The magnetocaloric effect of the crystal was investigated and found to be inverse due to the magnetic entropy change associated with the antiferromagnetic transition and the strong ferromagnetic interaction, indicating the suitability of the perovskite hybrid as a candidate for an environmentally friendly low-temperature magnetic cooling technology. The overall results promise a potential multipurpose two-dimensional (2D) perovskite for future electronic applications in a wide temperature range.

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“…Magnetic materials with rare-earth components showing normal [5,6] or inverse MCEs [7] are widely explored in the MR technology due to their large magnetic moments, such as La 0.7−x Pr x Ca 0.3 MnO 3 [8], Er-Ho-Co [9,10], and Ho-Er-Ni [11]. In particular, rare-earth based amorphous alloys such as Ho-, Dy-, Er-, Gd-based alloys exhibit large magnetic entropy changes (-ΔS M ) over wide temperature ranges, resulting in the large refrigerant capacities (RC) [5].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Curie temperature and cooling efficiency in melt-extracted Gd50(Co69.25Fe4.25Si13B13.5)50 microwires

Bao

Shen

Xing

et al. 2017

Journal of Alloys and Compounds

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We report enhancements of both Curie temperature and magnetic refrigerant capacity in Gd 50 (Co 69.25 Fe 4.25 Si 13 B 13.5) 50 microwires, which were fabricated by the melt-extraction method. For a field change of 5 T, the maximum magnetic entropy change (-ΔS M max), the refrigerant capacity (RC) and relative cooling power (RCP) reached high values of 6.56 J•kg-1 •K-1 , 625 J•kg-1 and 826 J•kg-1 , respectively. While the RC is similar to those of our previously reported GdAlCo microwires, a much broader working temperature range of ~126 K and a higher Curie temperature of 170 K make the Gd 50 (Co 69.25 Fe 4.25 Si 13 B 13.5) 50 microwires more attractive for active magnetic refrigeration.

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The normal and inverse magnetocaloric effect in RCu2 (R=Tb, Dy, Ho, Er) compounds

Cited by 34 publications

References 40 publications

The magnetic properties and magnetocaloric effects in binaryR–T(R= Pr, Gd, Tb, Dy, Ho, Er, Tm;T= Ga, Ni, Co, Cu) intermetallic compounds

The magnetic properties and magnetocaloric effects in binaryR–T(R= Pr, Gd, Tb, Dy, Ho, Er, Tm;T= Ga, Ni, Co, Cu) intermetallic compounds

Segmented Highly Reversible Thermochromic Layered Perovskite [(CH₂)₂(NH₃)₂]CuCl₄ Crystal Coupled with an Inverse Magnetocaloric Effect

Enhanced Curie temperature and cooling efficiency in melt-extracted Gd50(Co69.25Fe4.25Si13B13.5)50 microwires

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The normal and inverse magnetocaloric effect in RCu2 (R=Tb, Dy, Ho, Er) compounds

Cited by 34 publications

References 40 publications

The magnetic properties and magnetocaloric effects in binaryR–T(R= Pr, Gd, Tb, Dy, Ho, Er, Tm;T= Ga, Ni, Co, Cu) intermetallic compounds

The magnetic properties and magnetocaloric effects in binaryR–T(R= Pr, Gd, Tb, Dy, Ho, Er, Tm;T= Ga, Ni, Co, Cu) intermetallic compounds

Segmented Highly Reversible Thermochromic Layered Perovskite [(CH2)2(NH3)2]CuCl4 Crystal Coupled with an Inverse Magnetocaloric Effect

Enhanced Curie temperature and cooling efficiency in melt-extracted Gd50(Co69.25Fe4.25Si13B13.5)50 microwires

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Segmented Highly Reversible Thermochromic Layered Perovskite [(CH₂)₂(NH₃)₂]CuCl₄ Crystal Coupled with an Inverse Magnetocaloric Effect