摘要
The Curie temperatures(T_(C))of La_(0.7)Ce_(0.3)Fe_(13-x-y)Mn_(x)Si_(y)compounds that are hydrogenated to saturation are raised to near room temperature.The age stability was inves-tigated for the fully hydrogenated La_(0.7)Ce_(0.3)Fe_(11.5-x)Mn_(x)Si_(1.5) compounds.This result indicates that the H content will slowly decrease in the hydrides,leading to a decrease in T_(C).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 T_(C)of La_(0.7)Ce_(0.3)Fe_(11.55-y)Mn_(y)Si_(1.45)hydrides can be adjusted to the desired working temperature by regulating Mn content based on the linear relationship between T_(C)and Mn content.Moreover,the La_(0.7)Ce_(0.3)Fe_(11.55-y)Mn_(y)Si_(1.45)hydrides exhibit a giant magnetic entropy change of 15 J·kg^(-1)·K^(-1) under a low magneticfield change of 0-1 T.As a result,the giant magnetocaloric effect,linearly adjustable T_(C),and excel-lent age stability make the La_(0.7)Ce_(0.3)Fe_(11.55-y)Mn_(y)Si_(1.45)hydrides be one of the ideal candidates for room temperature magnetic refrigerants.
出处
《Rare Metals》
SCIE
EI
CAS
CSCD
2022年第3期992-1001,共10页
稀有金属（英文版）
基金
financially supported by the National Key Research and Development Program of China (No. 2017YFB0702704)
the National Science Foundation of China (No. 51571018)。
