Magnetocaloric phenomena in Mg-ferrite nanoparticles

Burianova, S.; Vejpravová, Jana; Holec, Petr; Plocek, Jiřı́

doi:10.1088/1742-6596/200/7/072015

Cited by 9 publications

(6 citation statements)

References 7 publications

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“…The broadness of the ∆S M as a function of temperature is due to the slow decrease in magnetization from ~50 K to 400 K. Similar behavior of ∆S M has been reported in some Co and Mg based ferrites. 5,8 The study by Xi et al indicated that La 0.8 Ca 0.2 MnO 3 nanoparticles with a particle size of 17 nm have a broad range of ∆S M . 7 The maximum ∆S M of the La 0.8 Ca 0.2 MnO 3 sample for a field of 4 T was ~ -0.52 J-kg -1 -K -1 at a temperature of 100 K, this value is less than that of our maximum ∆S M of -0.71 J-kg -1 -K -1 at 160K for the same field.…”

Section: Resultsmentioning

confidence: 99%

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Iron Oxide-based Magnetic Nanoparticles for High Temperature Span Magnetocaloric Applications

Chaudhary

Ramanujan

2014

MRS Proc.

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The magnetocaloric effect of chemically synthesized Mn 0.3 Zn 0.7 Fe 2 O 4 superparamagnetic nanoparticles with average crystallite size of 11 nm is reported. The magnitude of the magnetic entropy change (ΔS M ), calculated from magnetization isotherms in the temperature range of 30 K to 400 K, increases from -0.16 J-kg -1 K -1 for a field of 1 T to -0.88 J-kg -1 K -1 for 5 T at room temperature. Our results indicate that ΔS M values are much higher than primarily reported values for this class of nanoparticles. ΔS M is not limited to the ferromagnetic-paramagnetic transition temperature; instead, it occurs over a broad range of temperatures, resulting in high relative cooling power.

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Section: Resultsmentioning

confidence: 99%

“…7 In another study, Co-and Mg-ferrite nanoparticles also exhibited a wide change in entropy accompanying a second order phase transitions. 5,8 The main advantage of such nanoparticles is a broad working temperature range, which increases the relative cooling power (RCP).…”

Section: Introductionmentioning

confidence: 99%

Iron Oxide-based Magnetic Nanoparticles for High Temperature Span Magnetocaloric Applications

Chaudhary

Ramanujan

2014

MRS Proc.

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“…Considerable investigations indicate that the nanostructured materials are very promising candidates for potential application in the magnetic refrigeration (Zhang et al 2001;Tanaka et al 2001;Hueso et al 2002;Provenzanoa et al 2003;Shir et al 2003;Kinoshita et al 2004;Evangelisti et al 2005;Poddar et al 2006;Gómez-Polo et al 2007;Ma et al 2007;Baldomir et al 2007;Franco et al 2007;škorvánek et al 2007;Poddar et al 2007;Biswas et al 2008;Franco et al 2008;Gorsse et al 2008;Li 2008;Gass et al 2008;Lu et al 2008;Santanna et al 2008;Serantes et al 2008;Pekała and Drozd 2008;Juan and Gui 2009;Gorria et al 2009;Phan et al 2009;Babita et al 2009;Calderon-Ortiz et al 2009;Das et al 2009;Phan et al 2010;Burianova et al 2010;Nelson et al 2002). However, up to now, not much effort has been devoted to the rare earth bulk nanocrystalline metals.…”

Section: Introductionmentioning

confidence: 99%

Magnetic entropy change in bulk nanocrystalline Gd metals

et al. 2011

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The magnetocaloric properties of the asconsolidated nanocrystalline and coarse-grained gadolinium metals were studied in the present work. With the decrease of Gd grains from micrometer to nanometer range, magnetic entropy change drops surprising from 10.07 to 4.47 J kg -1 K -1 at a magnetic-field change of 5 T, and their resultant magnetic entropy change uniformly peaks at 294, 290, and 288 K, respectively, corresponding to the magnetic transition temperature of the three samples. The Curie temperature T C of the nanocrystalline Gd shifts by more than 6 K below that of coarse-grained Gd sample. However, the values of magnetic entropy change of the nanocrystalline metals exhibit a more constant tendency compared with the coarse-grained sample. The Arrott plots indicate the second-order character of magnetic phase transition still in the nanocrystalline Gd metals. The refrigerant capacity calculated is also used to evaluate material refrigeration capacity.

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“…Unlike films, which are expected to have low refrigeration capacity due to low volume, nanoparticles have the potential to overcome this problem if a scalable and costeffective method of nanoparticle fabrication can be developed. Few articles have been published recently on the magnetocaloric effect of ferrites and non-rare earth particles which is below 1 J/kgK for a field change of 3 tesla [9][10][11]. Gadolinium nanoparticles are also widely used as contrast agents during magnetic resonance imaging (MRI) however, the particles are paramagnetic at body temperature.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Room Temperature Ferromagnetic Nanoparticles of Gd₅Si₄

et al. 2015

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Gd5(SixGe1-x)4 compounds undergo first-order phase transitions close to room temperature when x ~ = 0.5, which are accompanied by extreme changes of properties. We report the fabrication of the nanoparticles of one of the parent compounds-Gd5Si4-using high-energy ball milling. Crystal structure, microstructure, and magnetic properties have been investigated. Particles agglomerate at long milling times, and the particles that are milled >20 min lose crystallinity and no longer undergo magnetic phase transition close to 340 K, which is present in a bulk material. The samples milled for >20 min exhibit a slightly increased coercivity. Magnetization at a high temperature of 275 K decreases with the increase in the milling time. This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. 1-x ) 4 compounds undergo first order phase transitions close to room temperature when x  0.5, which are accompanied by extreme changes of properties. We report the fabrication of nanoparticles of one of the parent compounds -Gd 5 Si 4 -using high energy ball milling. Crystal structure, microstructure and magnetic properties have been investigated. Particles agglomerate at long milling times and the particles that are milled longer than 20 min lose crystallinity and no longer undergo magnetic phase transition close to 340 K, which is present in a bulk material. Samples milled for more than 20 min exhibit a slightly increased coercivity. Magnetization at a high temperature of 275K decreases with increase in milling time.

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Magnetocaloric phenomena in Mg-ferrite nanoparticles

Cited by 9 publications

References 7 publications

Iron Oxide-based Magnetic Nanoparticles for High Temperature Span Magnetocaloric Applications

Iron Oxide-based Magnetic Nanoparticles for High Temperature Span Magnetocaloric Applications

Magnetic entropy change in bulk nanocrystalline Gd metals

Investigation of Room Temperature Ferromagnetic Nanoparticles of Gd₅Si₄

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Magnetocaloric phenomena in Mg-ferrite nanoparticles

Cited by 9 publications

References 7 publications

Iron Oxide-based Magnetic Nanoparticles for High Temperature Span Magnetocaloric Applications

Iron Oxide-based Magnetic Nanoparticles for High Temperature Span Magnetocaloric Applications

Magnetic entropy change in bulk nanocrystalline Gd metals

Investigation of Room Temperature Ferromagnetic Nanoparticles of Gd5Si4

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Investigation of Room Temperature Ferromagnetic Nanoparticles of Gd₅Si₄