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Methods for the Syntheses of Perovskite Magnetic Nanomagnets
Published in Ram K. Gupta, Sanjay R. Mishra, Tuan Anh Nguyen, Fundamentals of Low Dimensional Magnets, 2023
The magnetocaloric effect (MCE) and its direct application in magnetic refrigeration are popular topics due to their potential improvements in the energy efficiency of cooling and temperature control systems. That enables this technology to have the merits of high security, low energy consumption, low pollution, and low capital cost. Recently, perovskite oxide magnetic nanoparticles have been used as potential candidates for magnetic refrigeration based on an enhanced magnetocaloric effect. Mahato et al. [80] reported a large magnetic entropy change (ΔS = 12.5 J kg-1 K-1) in the La0.7Te0.3MnO3 nanoparticles near TC with a magnetic field change of 50 kOe. Yang et al. [81] also reported a maximum value of ΔS of 1.01 and 1.20 J kg-1K-1 for the La0.7Ca0.3MnO3 nanoparticles with an average size of 30 and 50 nm and under a magnetic field of 15 kOe, respectively. That indicates the La0.7Ca0.3MnO3 nanoparticles have promising applications in magnetic refrigeration at room temperature.
Beneficial Commercial Building Uses of Electricity
Published in Clark W. Gellings, 2 Emissions with Electricity, 2020
New giant magnetocaloric effect (GMCE) materials with much larger MCEs at lower applied magnetic field changes has resulted in the potential for increased efficiency. Gadolinium (Gd) and its alloys are currently the best available materials for magnetic refrigeration near room temperature, as illustrated in Figure 9-9. The MCE is most intense at the Curie temperature (Tc), and higher magnetic fields intensify the MCE. Since magnetic forces increase with increasing magnetic field, it is critical to balance forces. It is necessary to get the heat transfer fluid flow to match the magnetic forces.
Magnetic Materials Prepared Using Polyacrylamide Gel Route
Published in Sam Zhang, Dongliang Zhao, Advances in Magnetic Materials, 2017
S. F. Wang, X. T. Zu, Richard YongQing Fu
Among these applications, magnetic refrigeration is a predominant technology for the refrigerator, and exhibits a magnetocaloric effect at extremely low temperature. The magnetocaloric effect was first reported by Weiss and Piccard in 1917 [291]. In 1933, sustained efforts of several research groups were directed toward the design of magnetic refrigerators.
Magnetic properties and large magnetocaloric effect in the perovskite Mn3GeC compound: Ab initio and Monte Carlo calculations
Published in Phase Transitions, 2022
Y. Charif Alaoui, N. Tahiri, O. El Bounagui, H. Ez-Zahraouy
The magnetic refrigeration technique is now considered a serious alternative to conventional cooling. This technique is based on the magnetocaloric effect which is the fundamental physical properties of magnetic solids [1,2]. A large number of magnetocaloric effect materials have been discovered in recent years [3,4]. But Gd always remains one of the most suitable materials for real application refrigeration technologies. Magnetocaloric effect (MCE) can be characterized as an isothermal adiabatic change of material during a change in the external field, sign and magnitude of entropy, temperature variation between the initial and final state of the material, magnetic field strength, and final state of the material and many intrinsic/extrinsic factors. For the application, it is important to know not only the size of the refrigeration technology magnetocaloric effect (ECM), but also the position inside its maximum temperature, which is often related to the material studied. Therefore, the transition temperature determines the range [5]. In the present work, we investigated MCE the perovskite MM'C [6], with M being the transition metal M’ being the non-transition metal [7,8]. Recently, Mn-based perovskite compounds, of the general Mn3AXwhere X is (C, N), and A an element of group 13-15, have attracted remarkable attention because of their narrow hysteresis [9]. This compound has the structure of perovskite Mn3AX (A = Al, Zn, Ga, Ge, and Sn; X = C, N) [8]with a form of a series of compounds having the cubic shape of perovskite.
Ab initio calculations, mean field approximation and Monte Carlo simulation of the electronic, magnetic and magnetocaloric properties of the double perovskite Ba2NiReO6
Published in Phase Transitions, 2021
Othmane Amhoud, Smail Amraoui, Ahmed Zaim, Mohamed Kerouad
The double perovskite has been studied by using DFT, MFA and MCS.The electronic, magnetic and magnetocaloric properties of have been investigated.The interesting multiple hysteresis loops are shown. can be used in spintronic and magnetic refrigeration applications.
Critical evaluation and thermodynamic CALPHAD reassessment of Cerium–Nickel system
Published in Canadian Metallurgical Quarterly, 2023
Z. Rahou, D. Moustaine, Y. Ben-Ali, A. Hallaoui
The rare earth-transition metal (RE-TM) compounds play a crucial role in various energy and high-tech applications. They are extensively used to enhance electric machines [1,2] and develop hydrogen storage materials [3]. These compounds also hold potential as candidates for magnetic refrigeration, leveraging the magnetocaloric effect (MCE) [4,5]. Magnetic refrigeration offers improved energy efficiency and eco-friendliness compared to conventional compression/expansion gas refrigeration methods [6,7]. Additionally, RE-TM compounds contribute significantly to micromechanics [8], terahertz emitters [9], magneto-optical recording media [10], aeronautical turbines [11], and battery electrodes [12].