It is interesting that the addition of carbon atoms is required to stabilize the BaCd11-type structure. In RFe9Si2Cx, the carbon atom occupies the interstitial 8c site of the tetragonal space group of I41/amd (No. 141). TC progressively increases with the increase of x, for example, ...
The doping Si atom bond with the N or Ti that formed the interface structure based the composite structure of grain and interfaces. Thus, the substitution and interstitial interfaces were determined by the stability of the doping structure, in which the Si atom occupies the N atom or the ...