首页|Mechanism of reduction-diffusion reaction in Sm-Fe binary system at low temperature using molten salts
Mechanism of reduction-diffusion reaction in Sm-Fe binary system at low temperature using molten salts
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In this study,the mechanism of the reduction-diffusion reaction in a Sm-Fe binary system at low temperature was studied to investigate the possibility of synthesis of a Fe-rich TbCu7-type SmFex(x＞9)by the low-temperature diffusion-reduction(LTRD)process using LiCl-KCl eutectic molten salts.Firstly,the Sm-Fe phase transformation depending on the Sm-Fe composition,the LTRD temperature,and time was investigated,and it is found that the obtained metastable phase is only TbCu7-type SmFe～8.5,which is not a Fe-rich phase.This Fe content does not change even after an expended LTRD process,and the metastable TbCu7-type SmFe～8.5 tends to transform to the stable Sm2Fe17 phase.In addition,it is found that the Sm-Fe phase starts to synthesize from the Sm-rich phase in the order of SmFe2,SmFe3,and SmFe8.5 as the LTRD temperature increases(when the time was 10 h)or the LTRD time increases(when the temperature was 550 ℃).Core-shell-like particles are observed in the case of a short LTRD time,and the core and the shell are Fe and the Sm-rich Sm-Fe phase,respectively,indicating that the Sm-rich phase begins to produce on the surface of the Fe particles.It is difficult to synthesize a Fe-rich TbCu7-type SmFex(x＞9)phase with the Sm-Fe binary system,suggesting that a different approach,such as addition of other elements,will be necessary.
Innovative Functional Materials Research Institute,National Institute of Advanced Industrial Science and Technology(AIST),4-205 Sakurazaka,Moriyama-ku,Nagoya,463-8560,Aichi,Japan
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