Magnetocaloric effect: From materials research to refrigeration devices

Effect of high temperature sintering on the structural and the magnetic properties of La1.4Ca1.6Mn2O7

Silica-coated lanthanum–strontium manganite particles with La0.76Sr0.24MnO3+δ stoichiometric formula, exhibiting Curie temperature at ∼40°C, were prepared by using a traditional solid-state method of synthesis of magnetic ceramic particles, followed by milling and a low-temperature coating procedure in an aqueous alcoholic alkali medium. The properties of the obtained material establish it as a potential candidate for self-regulated power-absorbing and temperature-controlling materials in hyperthermia treatments. Moreover, core-comprising LaSr–manganites with different stoichiometries, ranging from La0.5Sr0.5MnO3+δ to LaMnO3+δ, were synthesized, with magnetic and structural properties examined thereof. Herein reported findings can potentially be used in the preparation of silica-coated magnetic particles with designable Curie temperature, offering a wide range of possibilities of adapting the material to practical instrumental setups in drug delivery and hyperthermia treatments.

/pdf/preparation-of-silica-coated-lanthanum-strontium-manganite-493bnvpzru.pdf

Preparation of Silica-Coated Lanthanum-Strontium Manganite Particles with Designable Curie Point, for Application in Hyperthermia Treatments

The magnetocaloric proprieties of Ba2Fe1−x
 Cr
 x
 MoO6 (cubic, Fm3m) have been investigated. With the help of the phenomenological model, the temperature dependences of the magnetization for Ba2Fe1−x
 Cr
 x
 MoO6 (0 ≤ x ≤ 1) in a 1 T magnetic field were simulated. The behavior of the temperature-dependent magnetocaloric effect was investigated in the vicinity of magnetic phase transitions. The magnetic entropy change and the specific heat were obtained. The values of the maximum magnetic entropy change, the full width at half maximum, and the relative cooling power for a change in the magnetic field of 1 T were calculated. The values and the shapes of −ΔS
 M
 and −ΔC
 p
 strongly depended on the Cr concentration. As x was increased, the maximum values of −ΔS
 M
 and −ΔC
 p
 decreased and the peaks of −ΔS
 M
 and −ΔC
 p
 became broader. The magnetocaloric effect of this material is large and tunable, suggesting a possible technical application of the material at moderate magnetic fields at temperatures near room temperature. For Ba2Fe1−x
 Cr
 x
 MoO6, the magnetic entropy change was shown to follow a master curve behavior.

Magnetocaloric properties in ordered double-perovskite Ba 2 Fe 1- x Cr x MoO 6 (0 ≤ x ≤ 1)

Large magnetocaloric effects in Pr-doped La1.4-xPrxCa1.6Mn2O7 bilayer manganites

Magnetocaloric properties of perovskite-type manganese oxides with double Mn-O layers of composition La2−2xSr1+2xMn2O7 (x=0.33 and 0.4) have been investigated. A broad peak of magnetic entropy change (−ΔSM) was observed at the Curie temperature. The shape of −ΔSM is strongly dependent on the Sr concentration. In contrast to Ln1−xAxMnO3 perovskites, the distinct curvilinear shape of −ΔSM for perovskites with double Mn-O layers shows different magnetic mechanisms arising from magnetocrystalline anisotropy.

/pdf/magnetic-entropy-change-of-the-layered-perovskites-la2-2xsr1-g8lkrya66q.pdf

Magnetic entropy change of the layered perovskites La2−2xSr1+2xMn2O7

Magnetic entropy change and colossal magnetoresistance effect in the layered perovskite La1.34Sr1.66Mn2O7

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Magnetic entropy change of the layered perovskites La2−2xSr1+2xMn2O7

Magnetic entropy change and colossal magnetoresistance effect in the layered perovskite La1.34Sr1.66Mn2O7