Influence of size distribution on the magnetocaloric effect of superparamagnetic gold–magnetite nanocomposite

Kinoshita, Takuya; Seino, Satoshi; Maruyama, Hiroki; Otome, Yohei; Okitsu, Kenji; Nakayama, Tadachika; Niihara, K.; Nakagawa, Takashi; Yamamoto, Takao A.

doi:10.1016/s0925-8388(03)00663-7

Cited by 29 publications

(28 citation statements)

References 15 publications

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“…Starting reagents, La 2 O 3 , Sr(NO 3 ) 2 and MnCO 3 , were dissolved in diluted nitric acid at continuous stirring and moderated heating. Lanthanum oxide before a use was calcined at 1000°C for 24 h to remove hydroxide and carbonate impurities.…”

Section: Samplesmentioning

confidence: 99%

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Magnetocaloric effect in nano- and polycrystalline La0.8Sr0.2MnO3 manganites

Pękała

Drozd

2008

Journal of Non-Crystalline Solids

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Section: Samplesmentioning

confidence: 99%

“…to the nanostructured material. The narrow grain size distribution of nanostructured superparamagnetic systems was found to enhance the magnetocaloric effect [2]. A present study is focused on an influence of the nanocrystalline structure on magnetocaloric properties of the La 0.8 Sr 0.2 MnO 3 manganite.…”

Section: Introductionmentioning

confidence: 97%

Magnetocaloric effect in nano- and polycrystalline La0.8Sr0.2MnO3 manganites

Pękała

Drozd

2008

Journal of Non-Crystalline Solids

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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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“…To date, not too many studies of the MCE in nanocomposites have been reported [8][9][10][11][12]. Even though these reports indicate an enhanced MCE due to the reduction of grain size to the nanoscale dimensions, the overall effect is quite low due to the fact that the nanoparticles have to be dispersed in a matrix in order to prevent the agglomeration associated with the surface energy minimization.…”

Section: Introductionmentioning

confidence: 99%