Enhanced low-field magnetocaloric effect in Nb and Al co-substituted EuTiO3 compounds

Xie, Huicai; Su, Wei; Lu, Hangjun; Mo, Zhaojun; Wang, Dunhui; Sun, Hao; Lu, Tian; Gao, Xinqiang; Liu, Zhenxing; Shen, Jun

doi:10.1016/j.jmst.2022.02.005

Cited by 38 publications

(6 citation statements)

References 35 publications

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“…Recently reported materials for conventional MCE show the variation of TEC (5) in µ 0 Δ H = 1 T between 1 and 10 J K −1 kg −1 41 , 48 – 53 ; thus, the RMCE results reported for Tb-SMM and Dy-SMM fall in a moderate range with TEC (5) = 2.42 J K −1 kg −1 for the former and TEC (5) = 2.13 J K −1 kg −1 for the latter in the same magnetic field. The studies of the RMCE in HoNiGe 3 single crystal 54 presented a much higher TEC (5) of approximately 12 J K −1 kg −1 in µ 0 Δ H = 5 T compared to the corresponding values of 3.55 J K −1 kg −1 in µ 0 H = 4 T for Tb-SMM , and 2.82 J K −1 kg −1 in µ 0 H = 5 T for Dy-SMM , but with significantly smaller entropy change in µ 0 Δ H = 1 T and higher temperatures for which the entropy change maximum was observed (between 5 and 15 K).…”

Section: Discussionmentioning

confidence: 99%

Rotating magnetocaloric effect in highly anisotropic TbIII and DyIII single molecular magnets

Konieczny

Czernia

Kajiwara

2022

Sci Rep

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The magnetocaloric effect (MCE) was investigated in highly anisotropic single crystals of two single molecule magnets (SMMs): [LnIII(ZnIIL)2]CF3SO3, where Ln = Tb, Dy and L = tripodal hexadentate Schiff base ligand. The structure of these paramagnetic compounds consists of identically oriented linear trinuclear clusters in a trigonal system with an easy direction c∥Zn–Ln–Zn array and a hard plane ab⊥Zn–Ln–Zn array. The magnitude of MCE measured for c∥H was significantly greater than MCE for ab∥H at a wide temperature range regardless of the studied SMM. Therefore, the rotating magnetocaloric effect (RMCE) was evaluated. The maxima of the magnetic entropy change for RMCE were obtained at 2.0 K and moderate fields: 3.9 J K−1 kg−1 at µ0H = 1.3 T for Ln = Tb and 3.3 J K−1 kg−1 at µ0H = 1.1 T for Ln = Dy. The relative efficiency of RMCE compared to the MCE measured in c∥H was as high as 99% at low magnetic fields.

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Section: Discussionmentioning

confidence: 99%

Rotating magnetocaloric effect in highly anisotropic TbIII and DyIII single molecular magnets

Konieczny

Czernia

Kajiwara

2022

Sci Rep

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“…Compared to Gd 3+ ions, Eu 2+ ions also have the same J- value and magnetic isotropy. In addition, exchange and superexchange interactions between neighboring Eu 2+ ions lead to some fantastic magnetic properties. , Eu-based compounds may discover a large MCE. However, only a limited number of compounds with Eu 2+ have been investigated for their ultralow-temperature magnetic properties, and even fewer MCEs have been reported in recent years.…”

Section: Introductionmentioning

confidence: 99%

Giant Low-Field Cryogenic Magnetocaloric Effect in a Polycrystalline EuB₄O₇ Compound

Wang,

Xiang,

Zhang

et al. 2024

J. Am. Chem. Soc.

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To deal with the shortage and high price of helium-3 resources, adiabatic demagnetization refrigeration technology as an alternative to helium-3-based refrigeration technology has received much attention. The magnetism and ultralow-temperature magnetocaloric effect (MCE) of the EuB 4 O 7 compound have been investigated. The results of magnetic and quasi-adiabatic demagnetization measurements suggest the absence of a magnetic order above 0.4 K for EuB 4 O 7 . The dipolar interaction between the nearest-neighbor Eu atoms has a characteristic energy of about 800 mK, which may induce a large MCE. The maximum magnetic entropy change reaches 22.8, 36.2, and 47.6 J•kg −1 K −1 at μ 0 H = 0− 10 kOe, 0−20 kOe, and 0−50 kOe, respectively. Measurements by a quasi-adiabatic demagnetization device show that the lowest temperature achievable (289 mK) for polycrystalline EuB 4 O 7 is lower than that (362 mK) for the commercial refrigerant Gd 3 Ga 5 O 12 (GGG) single crystals. The hold time is more than 70 min below 700 mK, with an environment temperature of 2 K, proving that EuB 4 O 7 exhibits superior cooling performance.

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“…Green refrigeration systems based on the magnetocaloric effect have recently received attention as novel and sustainable methods of meeting the globally increasing energy demand [1][2][3]. This type of refrigeration system has the potential to replace and become a substitute for present-day commercialized gas compression technology that has associated disadvantages from the perspectives of efficiency and environmental friendliness [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Single Hidden Layer Intelligent Approach to Modeling Relative Cooling Power of Rare-Earth-Transition-Metal-Based Refrigerants for Sustainable Magnetic Refrigeration Application

Alqahtani

2024

Sustainability

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Solid-state magnetocaloric-based magnetic refrigeration offers green and sustainable refrigeration with improved efficiency, compactness and environmental friendliness compared with commercialized gas compression refrigeration systems. Relative cooling power (RCP) plays a significant role in the candidature of any magnetic material refrigerants in this application, while the tunable physical and magnetic properties of rare-earth-transition-metal-based materials strengthen the potential of these materials to be used in a cooling system. This work develops single hidden layer (SIL) extreme learning machine intelligent models for predicting the RCP of rare-earth-transition-metal-based magnetocaloric compounds using elemental constituent ionic radii (IR) and maximum magnetic entropy change (EC) descriptors. The developed model based on the sine (SN) activation function with ionic radii (IR) descriptors (SN-SIL-IR) shows superior performance over the sigmoid (SG) activation function-based model, represented as SG-SIL-IR, with performance improvements of 71.86% and 69.55% determined using the mean absolute error (MAE) and root mean square error (RMSE), respectively, upon testing rare-earth-transition-metal-based magnetocaloric compounds. The developed SN-SIL-IR further outperforms the SN-SIL-EC and SG-SIL-EC models which employed maximum magnetic entropy change (EC) descriptors with improvements of 45.74% and 24.79%, respectively, on the basis of MAE performance assessment parameters. Estimates of the developed model agree well with the measured values. The dependence of the RCP on an applied magnetic field for various classes of rare-earth-transition-metal-based magnetocaloric compounds is established using a developed SN-SIL-IR model. The improved precision of the developed SN-SIL-IR model, coupled with ease of its descriptors, will strengthen and facilitate the comprehensive exploration of rare-earth-transition-metal-based magnetocaloric compounds for their practical implementation as magnetic refrigerants for promoting a sustainable system of refrigeration that is known to be efficient and environmentally friendly.

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Enhanced low-field magnetocaloric effect in Nb and Al co-substituted EuTiO3 compounds

Cited by 38 publications

References 35 publications

Rotating magnetocaloric effect in highly anisotropic TbIII and DyIII single molecular magnets

Rotating magnetocaloric effect in highly anisotropic TbIII and DyIII single molecular magnets

Giant Low-Field Cryogenic Magnetocaloric Effect in a Polycrystalline EuB₄O₇ Compound

Single Hidden Layer Intelligent Approach to Modeling Relative Cooling Power of Rare-Earth-Transition-Metal-Based Refrigerants for Sustainable Magnetic Refrigeration Application

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Enhanced low-field magnetocaloric effect in Nb and Al co-substituted EuTiO3 compounds

Cited by 38 publications

References 35 publications

Rotating magnetocaloric effect in highly anisotropic TbIII and DyIII single molecular magnets

Rotating magnetocaloric effect in highly anisotropic TbIII and DyIII single molecular magnets

Giant Low-Field Cryogenic Magnetocaloric Effect in a Polycrystalline EuB4O7 Compound

Single Hidden Layer Intelligent Approach to Modeling Relative Cooling Power of Rare-Earth-Transition-Metal-Based Refrigerants for Sustainable Magnetic Refrigeration Application

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Giant Low-Field Cryogenic Magnetocaloric Effect in a Polycrystalline EuB₄O₇ Compound