Large magnetocaloric effect and refrigerant capacity near room temperature in as-cast Gd5Ge2Si2−xSnx compounds

Abstract

Large values of isothermal entropy change (ΔST) and refrigerant capacity have been found in Gd5Ge2Si2−xSnx compounds. Values of the order of 20 J kg−1 K−1 for −ΔST were obtained in as-cast samples when submitted to a magnetic field variation of 2 T. First-order-magneto-structural transition is induced by the substitution of silicon by tin and it is shifted to lower temperatures with the tin content. It means that the magnetocaloric effect on this series can be properly tuned to a specific practical thermodynamic cycle, including near room temperature range.

Magnetocaloric effect in an Ising–Heisenberg diamond chain with direct monomer spin couplings

“…Recently, some specially designed magnetic materials with the potential application of MCE in room‐temperature cooling renewed the interest in this field . Large values of isothermal entropy change and improved refrigerant capacity have been found in these compounds.…”

The transformation of the magnetostructural phase transition with Ti addition in Gd5Si2Ge2

“…Therefore the great interest presents the search of optimal substitution in p-or 4f-sublattice for reduction of hysteresis. The influence of small Sn and In substitutions on the magnetostructural phase transitions have been studied in detail [3][4][5]. These studies have shown that the Curie temperature slightly shifts by not more than 10 K, the first order phase transition is preserved and MCE slightly increases with small p-element addition.…”