Structural and magnetic properties of magnetocaloric LaFe13–xSix compounds synthesized by high energy ball-milling

Phejar, M.; Paul‐Boncour, V.; Bessaïs, L.

doi:10.1016/j.intermet.2010.07.022

Cited by 93 publications

(55 citation statements)

References 38 publications

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“…In fact, in our groups, we have provenin the Er6Fe17.66Al5.34C0.65 compound [23] that only one of the two 32f sites exhibited a significant deviation We have determined the distribution of Al atoms over the three possible Fe crystallographic sites. According to the Rietveld refinement and especially to the occupation refinement, we demonstrated and determined that the Al atoms are distributed in three crystallographic sites: 32f 1 (Table 2). In fact, in our groups, we have proven in the Er 6 Fe 17.66 Al 5.34 C 0.65 compound [23] that only one of the two 32f sites exhibited a significant deviation from the full occupancy with Fe atoms, indicating a substitution with Al atoms.…”

Section: X-ray Diffraction Resultsmentioning

confidence: 99%

“…Intermetallic compounds that contain rare-earth elements are particularly interesting because of their temperature-and pressure-dependent structural and physical transitions that make them potential candidates for magnetic applications [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…There are 116 atoms per unit cell occupying five non-equivalent crystal sites (24e, 4b, 24d, 32f 1 , and 32f 2 ). The magnetic properties of Er 6 Fe 23 were studied by Boltich et al [10].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Al Substitution on Structural, Magnetic, and Magnetocaloric Properties of Er6Fe23−xAlx (x = 0 and 3) Intermetallic Compounds

et al. 2017

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Abstract:The structural, magnetic, and magnetocaloric properties of Er 6 Fe 23−x Al x (x = 0 and 3) intermetallic compounds have been studied systematically. Samples were prepared using the arc furnace by annealing at 1073 K for one week. Rietveld analysis of XRD shows the formation of pure crystalline phase with cubic Fm-3m structure. Refinement results show that the unit cell volume decreases with increasing Al content. The Curie temperature Tc of the prepared samples was found to be strongly dependent on the aluminum content. This reduces magnetization and the ferrimagnetic phase transition temperature (Tc) from 481 K (for x = 0) to 380 K (for x = 3), is due to the substitution of magnetic element (Fe) by non-magnetic atoms (Al). With the increase of the Al content, a decrease in the values of magnetic entropy is observed. The magnitude of the isothermal magnetic entropy (|∆SM|) at the Tc decreases from 1.8 J/kg·K for x = 0 to 0.58 J/kg·K for x = 3 for a field change 14 kOe. Respectively, the relative cooling power (RCP) decreases with increasing Al content reaching 42 Jkg −1 for x = 0 to 28 Jkg −1 for x = 3.

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Section: X-ray Diffraction Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Al Substitution on Structural, Magnetic, and Magnetocaloric Properties of Er6Fe23−xAlx (x = 0 and 3) Intermetallic Compounds

et al. 2017

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“…The XRD indicates that the alloys crystallize well in the NaZn 13 -type cubic structure with a small amount of α-Fe and LaFeSi existing as minor phases. It is imperative to note that the majority of published data on LaFe 13−x Si x alloys, no single-phase LaFe 13−x Si x alloys could be obtained [14][15][16][17] . Table 1 results in a linear increase of the lattice constant from 11.464 to 11.473 for x = 0 to x = 0.3…”

Section: Resultsmentioning

confidence: 99%

Enhancement of the refrigerant capacity in low level boron doped La0.8Gd0.2Fe11.4Si1.6

Shamba

Zeng

Wang

et al. 2013

Journal of Magnetism and Magnetic Materials

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Dou, S. X. (2013). Enhancement of the refrigerant capacity in low level boron doped La0.8Gd0.2Fe11.4Si1.6. Journal of Magnetism and Magnetic Materials, Enhancement of the refrigerant capacity in low level boron doped La0.8Gd0.2Fe11.4Si1.6 AbstractThe effects of boron doping on the itinerant-electron metamagnetic (IEM) transition and the magnetocaloric effects (MCEs) in the cubic NaZn13-type La0.8Gd0.2Fe11.4Si1.6 compound have been investigated. The Curie temperature, TC, of La0.8Gd0.2Fe11.4Si1.6Bx compounds with x=0, 0.03, 0.06, 0.2 and 0.3 was found to increase from 200 K to 222 K with increase in boron doping, x. The maximum values of the isothermal magnetic entropy change, ΔSM, (derived using the Maxwell relation for a field change ΔB=0-5 T) in La0.8Gd0.2Fe11.4Si1.6Bx with x=0, 0.03, 0.06, 0.2 and 0.3 are 14.8, 16, 15, 7.5 and 6.6 J kg−1 K−1 respectively, with corresponding values of the refrigerant capacity, RCP of 285, 361, 346, 222 and 245 J kg−1. The large ΔSM values observed for the undoped sample, and the low level B doped La0.8Gd0.2Fe11.4Si1.6B0.03 and La0.8Gd0.2Fe11.4Si1.6B0.06 compounds are attributed to the first order nature of the IEM transition while the decrease of ΔSM at x=0.2 and 0.3 is due to a change in the second order phase transition with increase in B doping. The nature of the magnetic phase transitions is also reflected by the magnetic hysteresis of 3.7, 9, 5.7, 0.4 and 0.3 J kg−1 for x=0.0, 0.03, 0.06, 0.2 and 0.30 respectively. The possibility of tuning the TC and the magnetocaloric properties at temperatures close to room temperature make this system interesting from the points of view of both fundamental aspects as well as applications.

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“…The morphology and crystalline structure were characterized by transmission electron microscopy (TEM). The magnetic properties were determined using a physical property measurement system (PPMS) magnetometer from Quantum Design operating up to 90 kOe [16,17].…”

Section: Characterizationmentioning

confidence: 99%

Comparative Study of Nanoparticles Fe 100−x Co x Alloy Synthesized by High Energy Ball Milling and by Polyol Process

Zehani

Boutahar

Elamiri

et al. 2015

J Supercond Nov Magn

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We report the synthesis of the Fe 100−x Co x (x = 55, 50, 45) alloys by two ways consisting in high energy ball milling and polyol process. A structural and morphological study of all samples has been undertaken by X-ray diffraction (XRD) using the Rietveld method, by scanning electron microscopy (SEM), and by transmission electron microscopy (MET). The size and crystallinity of the particles was found to depend on the synthesis method. The magnetic properties and the DOS calculation have been also investigated. It has been found that both were remarkably dependent on the Co/Fe molar ratio. It has been observed that the best magnetic properties was obtained for the sample x = 45 prepared by the polyol process where M s = 235 emu/g and H c = 93 Oe. We have shown also that the random local anisotropy field H r and the local anisotropy K L decrease with increasing Co content.

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Structural and magnetic properties of magnetocaloric LaFe13–xSix compounds synthesized by high energy ball-milling

Cited by 93 publications

References 38 publications

Effect of Al Substitution on Structural, Magnetic, and Magnetocaloric Properties of Er6Fe23−xAlx (x = 0 and 3) Intermetallic Compounds

Effect of Al Substitution on Structural, Magnetic, and Magnetocaloric Properties of Er6Fe23−xAlx (x = 0 and 3) Intermetallic Compounds

Enhancement of the refrigerant capacity in low level boron doped La0.8Gd0.2Fe11.4Si1.6

Comparative Study of Nanoparticles Fe 100−x Co x Alloy Synthesized by High Energy Ball Milling and by Polyol Process

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