The recombination stage of the HDDR process of Sm 2Fe 17 compound was investigated by X ray AFM and VSM. Hydrogen treatment at 750℃ for 3 h makes the Sm 2Fe 17 compound disproportionate completely into ...The recombination stage of the HDDR process of Sm 2Fe 17 compound was investigated by X ray AFM and VSM. Hydrogen treatment at 750℃ for 3 h makes the Sm 2Fe 17 compound disproportionate completely into α Fe and SmH 2 with grain sizes ranging from a few to 20 nm. These grains aggregate into short rod like aggregations. Because of the very short mutual diffusion distances between Sm and Fe atoms, α Fe and SmH 2 recombine into Sm 2Fe 17 very quickly. For only 1 min of dehydrogenation, a small amount of Sm 2Fe 17 compound is formed, and the recombination reaction is completed in 5～10 min.展开更多
文摘The recombination stage of the HDDR process of Sm 2Fe 17 compound was investigated by X ray AFM and VSM. Hydrogen treatment at 750℃ for 3 h makes the Sm 2Fe 17 compound disproportionate completely into α Fe and SmH 2 with grain sizes ranging from a few to 20 nm. These grains aggregate into short rod like aggregations. Because of the very short mutual diffusion distances between Sm and Fe atoms, α Fe and SmH 2 recombine into Sm 2Fe 17 very quickly. For only 1 min of dehydrogenation, a small amount of Sm 2Fe 17 compound is formed, and the recombination reaction is completed in 5～10 min.
