Investigation of phase fraction in α-Fe2Si5, ε-FeSi, and β-FeSi2 thermoelectric materials doped with Co and Ni

Abstract

We investigate the phase fraction in Co and Ni-doped β-FeSi2. For the β-Fe1-xCoxSi2, the formation of the α-phase is more dominant than the ε-phase. In contrast, for the β-Fe1-yNiySi2, the increase in the ε-phase is more dominant than the α-phase. This result indicates the phase transition in β-FeSi2 is dependent on the amount and type of dopant. This study offers a solution to evaluate the phase fraction of Co and Ni-doped β-FeSi2. Therefore, we could identify the range of optimum dopant concentration to prepare Co and Ni-doped β-FeSi2 for thermoelectric application with a preferable phase.