Magnetocaloric Properties of ${\hbox{La}}({\hbox{Fe}},{\hbox{Co}},{\hbox{Si}})_{13}$ Bulk Material Prepared by Powder Metallurgy

Katter, M.; Zellmann, V; Reppel, G.W.; Uestuener, K.

doi:10.1109/tmag.2008.2002523

Cited by 121 publications

(79 citation statements)

References 7 publications

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“…Compaction of the powder blends was performed by cold isostatic pressing. The green bodies were vacuum sintered at around 1100°C followed by an annealing treatment at 1050°C [14]. Hydrogenation was performed on granulate material with a particle size less than 1 mm.…”

Section: Experimental Methodsmentioning

confidence: 99%

Low-temperature specific heat in hydrogenated and Mn-dopedLa(Fe,Si)13

et al. 2016

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It is now well established that the paramagnetic to ferromagnetic transition in the magnetocaloric La(FeSi)13 is a cooperative effect involving spin, charge and lattice degrees of freedom. However, the influence of this correlated behaviour on the ferromagnetic state is as yet little studied. Here we measure the specific heat at low temperatures in a systematic set of LaFexMnySiz samples with and without hydrogen, to extract the Sommerfeld coefficient, the Debye temperature and the spin wave stiffness. Substantial and systematic changes in magnitude of the Sommerfeld coefficient are observed with Mn substitution and introduction of hydrogen, showing that over and above the changes to the density of states at the Fermi energy there are significant enhanced d band electronic interactions, at play. The Sommerfeld coefficient is found to be 90-210 mJmol -1 K -2 unusually high compared to that expected from band structure calculations. The Debye temperature determined from the specific heat measurement is insensitive to Mn and Si doping, but increases when hydrogen is introduced into the system. The Sommerfeld coefficient is reduced in magnetic field for all compositions that have a measurable spin wave contribution. These results move our understanding of the cooperative effects forward in this important and interesting class of materials significantly, and provides a basis for future theoretical development.

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Section: Experimental Methodsmentioning

confidence: 99%

Low-temperature specific heat in hydrogenated and Mn-dopedLa(Fe,Si)13

et al. 2016

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“…5 LaFe 11.71 Co 0.19 Si 1.11 referred to as LaFeCoSi-1 ͑size 3 ϫ 3 ϫ 1 mm 3 ͒ undergoes first-order phase transition with a Curie temperature T c ϳ 202 K. LaFe 10.97 Co 1.03 Si ͑size 2.1ϫ 1.8ϫ 1 mm 3 ͒ has second-order phase transition at T c ϳ 293 K and is referred to as LaFeCoSi-2. After measurements on LaFeCoSi-1 and LaFeCoSi-2 were completed the plates were broken into small pieces and a fragment from each with diameter 200 m was chosen for study.…”

Section: 15mentioning

confidence: 99%

Reducing extrinsic hysteresis in first-order La(Fe,Co,Si)13 magnetocaloric systems

Moore

Morrison

Sandeman

et al. 2009

Applied Physics Letters

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“…Another method is to replace some Fe atoms by other magnetic transition metals. It has been found that replacing Fe by only a few percent of Co enables a fi ne tuning of the critical temperature, and it has already been possible to produce industrially meaningful quantities (kilograms) of La -Fe -Co -Si material with good magnetocaloric properties around room temperature 18 . Th e paramagnetic to ferromagnetic transition in La -Fe -Si (and Co-doped) compounds is accompanied by a sizeable volume change of about 1 % (ref.…”

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confidence: 99%

Inverse barocaloric effect in the giant magnetocaloric La–Fe–Si–Co compound

et al. 2011

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Application of hydrostatic pressure under adiabatic conditions causes a change in temperature in any substance. This effect is known as the barocaloric effect and the vast majority of materials heat up when adiabatically squeezed, and they cool down when pressure is released (conventional barocaloric effect). There are, however, materials exhibiting an inverse barocaloric effect: they cool when pressure is applied, and they warm when it is released. Materials exhibiting the inverse barocaloric effect are rather uncommon. Here we report an inverse barocaloric effect in the intermetallic compound La-Fe-Co-Si, which is one of the most promising candidates for magnetic refrigeration through its giant magnetocaloric effect. We have found that application of a pressure of only 1 kbar causes a temperature change of about 1.5 K. This value is larger than the magnetocaloric effect in this compound for magnetic fi elds that are available with permanent magnets.

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Magnetocaloric Properties of ${\hbox{La}}({\hbox{Fe}},{\hbox{Co}},{\hbox{Si}})_{13}$ Bulk Material Prepared by Powder Metallurgy

Cited by 121 publications

References 7 publications

Low-temperature specific heat in hydrogenated and Mn-dopedLa(Fe,Si)13

Low-temperature specific heat in hydrogenated and Mn-dopedLa(Fe,Si)13

Reducing extrinsic hysteresis in first-order La(Fe,Co,Si)13 magnetocaloric systems

Inverse barocaloric effect in the giant magnetocaloric La–Fe–Si–Co compound

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