Age stability of La(Fe,Si)13 hydrides with giant magnetocaloric effects

• 作者: He Zhou Yi Long Salvatore Miraglia Florence Porcher Hu Zhang
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2022,（3）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 992-1001
• 页数: 10页
• 语种: 英文

摘要

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.