The Curie temperatures(Tc)of La0.7Ce0.3Fe13-x-y MnxSiy compounds that are hydrogenated to saturation are raised to near room temperature.The age stability was inves-tigated for the fully hydrogenated La0.7Ce0.3Fe 11.5-xMnxSi 1.5 compounds.This result indicates that the H content will slowly decrease in the hydrides,leading to a decrease in Tc.However,no age splitting is observed after the hydrides are held at room temperature for two years,indicating the excellent age stability of the hydrides.Further structural analysis by neutron diffrac-tion shows that Mn atoms preferentially substitute Fe in the 96i sites.The Tc of La0.7Ce0.3Fe11.55-yMnySi1.45 hydrides can be adjusted to the desired working temperature by regulating Mn content based on the linear relationship between Tc and Mn content.Moreover,the La0.7Ce0.3Fe11.55-yMnySi1.45 hydrides exhibit a giant magnetic entropy change of 15 J·kg-1·K-1 under a low magnetic field change of 0-1 T.As a result,the giant magnetocaloric effect,linearly adjustable Tc,and excel-lent age stability make the La0.7Ce0.3Fe11.55-yMnySi1.45 hydrides be one of the ideal candidates for room temperature magnetic refrigerants.

School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Tianjin College,University of Science and Technology Beijing,Tianjin 301830,China;CNRS,Institut Néel,Université Grenoble Alpes,25 Rue des Martyrs,38042 Grenoble,France

[1]He Zhou;Yi Long;Salvatore Miraglia;Florence Porcher;Hu Zhang-.Age stability of La(Fe,Si)13 hydrides with giant magnetocaloric effects)[J].稀有金属（英文版）,2022(03):992-1001

7Ce0,3Fe13,MnxSiy,xMnxSi,96i,3Fe11,yMnySi1,refrigerants

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