Structural and magnetocaloric effect of Ln 0.67 Sr 0.33 MnO 3 (Ln=La, Pr and Nd) nanoparticles

Magnetic and magnetocaloric properties of nanocrystalline La 0.5 Sr 0.5 MnO 3

“…Many reported results have proved that the smaller the particle size is, the higher the fraction of defects and broken bonds in the surface layer is, and the fewer the contribution to the magnetic entropy changes is. [20,32] So, the size reduced to nanoscale is generally detrimental for the increase of MCE of magnetic material.…”

“…Considering the magnetic phase transition dependence on the materials' size, the MCE is inevitably tuned by the reduction of particle size. Recently, Wang et al reported that the nanoparticles Ln 0.67 Sr 0.33 MnO 3 not only exhibit MCE in a wide temperature range but also have high relative cooling power [32]. Therefore, in this paper, we synthesize the nanocrystalline La 0.5 Sr 0.5 MnO 3 (LSMO) and study its magnetism and MCE.…”

Stable magnetocaloric effect and refrigeration capacity in Co-doped FeCoMnZrNbB amorphous ribbons near room temperature

“…The magnitude of MCE in a magnetic material is normally indicated by the entropy change (∆S T ) determined in isothermal conditions. In recent years, several series of magnetic materials have been found to exhibit significant MCEs near the transition temperatures, such as Gd-Si-Ge [1], Mn-As-Sb [2], La-Fe-Si [3], Mn-Fe-P-As [4], La-Sr-Mn-O [5,6], Ni-Mn-based Heusler alloys [7,8] and Fe-rich amorphous alloys [9]. Those materials have been considered to be potential candidates for magnetic refrigeration near room temperature.…”

Effect of non-stoichiometry on the structural, magnetic and magnetocaloric properties of La0.67Ca0.33Mn1+δO3 manganites

“…Therefore, the magnetic properties of the manganites strongly depend on the ratio of Mn 3+ /Mn 4+ and the interaction between Mn 3+ (or Mn 4+ ) and O 2− ions [14,15]. It has been confirmed that both the crystallographic structure and magnetic properties may be modified by controlling the doping level of A or B site [16,17,18,19,20]. Besides, deficient ions of (La,A)-positions and/or non-stoichiometric oxygen also may result in a modification of the mixed Mn 3+ /Mn 4+ valence state, which further gives rise to the change of T C and magnetocaloric properties [21,22,23,24,25,26,27].…”