Magnetocaloric performance of RE${}_5$Pd${}_2$In${}_4$ (RE = Tb-Tm) compounds

Abstract

Magnetocaloric performance of the RE${}_5$Pd${}_2$In${}_4$ (RE = Tb-Tm) rare earth compounds has been investigated using measurements of magnetization in the function of temperature and applied magnetic field. The maximum magnetic entropy change ($-\Delta S_M^{max}$) at magnetic flux density change ($\Delta {\mu }_{0}H$) of 0-9~T has been determined to be 3.3~J$\cdot$kg${}^{-1}\cdot$K${}^{-1}$ at 62~K for Tb${}_5$Pd${}_2$In${}_4$, 7.0~J$\cdot$kg${}^{-1}\cdot$K${}^{-1}$ at 22~K for Dy${}_5$Pd${}_2$In${}_4$, 12.6~J$\cdot$kg${}^{-1}\cdot$K${}^{-1}$ at 22~K for Ho${}_5$Pd${}_2$In${}_4$, 12.1~J$\cdot$kg${}^{-1}\cdot$K${}^{-1}$ at 17~K for Er${}_5$Pd${}_2$In${}_4$ and 11.9~J$\cdot$kg${}^{-1}\cdot$K${}^{-1}$ at 9.0~K for Tm${}_5$Pd${}_2$In${}_4$. The temperature averaged entropy change (TEC) with 3~K span equals 3.2, 7.0, 12.6, 12.2 and 11.8~J$\cdot$kg${}^{-1}\cdot$K${}^{-1}$ for RE = Tb-Tm, respectively. The relative cooling power (RCP) and refrigerant capacity (RC) are equal to respectively 258 and 215~J$\cdot$kg${}^{-1}$ in Tb${}_5$Pd${}_2$In${}_4$, 498 and 325~J$\cdot$kg${}^{-1}$ in Dy${}_5$Pd${}_2$In${}_4$, 489 and 403~J$\cdot$kg${}^{-1}$ in Ho${}_5$Pd${}_2$In${}_4$, 403 and 314~J$\cdot$kg${}^{-1}$ in Er${}_5$Pd${}_2$In${}_4$ and 234 and 184~J$\cdot$kg${}^{-1}$ in Tm${}_5$Pd${}_2$In${}_4$. The magnetocaloric properties of RE${}_5$Pd${}_2$In${}_4$ are comparable to those of other known magnetocaloric materials, which show good magnetocaloric performance at low temperatures. Among RE${}_5$Pd${}_2$In${}_4$, the highest values of parameters characterizing the magnetocaloric effect are found for RE = Ho and Er. Furthermore, for fixed RE element, the RE${}_5$Pd${}_2$In${}_4$ compound displays the highest RCP and RC values when compared to those of its isostructural RE${}_5$T${}_2$In${}_4$ (T = Ni, Pt) analogues.

9 pages, 3 figures. arXiv admin note: text overlap with arXiv:2212.07171