Perspective on synthesis, structure, and magnetic properties of R–Fe–H hydridesстатья
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Дата последнего поиска статьи во внешних источниках: 26 января 2022 г.
Аннотация:The structural and magnetic properties of the multicomponent R–Fe–H compounds with a high content of Fe and H are reported. The process of synthesis of the hydrides (R,R0)2Fe14BH5.5 [where R and R0 are light (Nd) and heavy (Dy, Ho, Er, Tm) rare earth metals, respec22 tively] with a maximum hydrogen content is described in detail. The paper also provides insights into the synthesis of single-crystalline hydrides using the example of the R2(Fe, Co)14BH3 series. The hydrides (R, Nd)2Fe14BH5.5, R2(Fe, Co)14BH3, R2(Fe, Al)17H3 have a signifi24 cantly increased volume as compared to the parent materials. High-field magnetization results of both parent and hydrogenated compounds at low temperatures are presented. Spin–reorientation phase transitions induced by an external magnetic field are observed. The parameter of the intersublattice exchange interaction and the influence of hydrogen on it are estied within the framework of the mean field theory. The magnetocaloric effect of the compounds with a magnetic compensation point is studied with a special emphasis placed on the change of the sign of the effect.