[19p-C213-1~18] 11.1 Fundamental properties

[19p-C213-12] [Young Scientist Presentation Award Speech] Investigation of thermal behavior and phase formation by TG-DSC analysis for the synthesis of BaFe₂As₂ polycrystalline superconductors

〇Shinnosuke Tokuta^1,2, Akiyasu Yamamoto^1,2 (1.TUAT, 2.JST-CREST)

Keywords:iron-based superconductors, Thermal analysis, TG-DSC

Thermal analysis was performed by thermogravimetry-differential scanning calorimetry (TG-DSC) on Ba-Fe-As and Ba-Fe-Co-As powders (metal mixture, mechanically alloyed powder, and polycrystalline powder). TG-DSC analysis revealed the formation temperatures and melting points of BaFe₂As₂ (Ba(Fe,Co)₂As₂) and impurities, such as FeAs and Fe₂As. It was also suggested that heat treatment of mechanically alloyed powder is effective for decrease of sintering temperature and improvement of phase purity.