Thermoelectric semiconductor iron disilicides produced by sintering elemental powders

Friction and wear properties of Fe–Si intermetallic compounds in ethyl alcohol

“…The Fe-66.7at% Si powder with a particle size of less than 45 mm was prepared by blending the Fe and Si powders, annealing at 1173 K for 172.8 ks and crushing using the stamp mill. After spark plasma sintering, only the Fe-66.7at% Si disk specimens were annealed at 1223 K for 604.8 ks because Ohta et al have reported that it was difficult to obtain the bFeSi 2 single phase disk specimens only by SPS [8,9]. After the sintering and annealing, the surface of each disk specimen was polished using a diamond paste or an alumina paste with a particle size of 1 mm.…”

Microstructures and thermoelectric properties of Co-doped iron disilicides prepared by rapid solidification and hot pressing

“…Mn-, Cr-, Zr-, or Al-doped FeSi 2 shows p-type conduction [6][7][8][9][10], while Co-or B-doped FeSi 2 shows n-type conduction [6,11]. But the low electrical conductivity σ and high thermal conductivity κ of the ␤-FeSi 2 based alloys lead to a dimensionless figure of merit, ZT = (α 2 σ/κ)T, of only about 0.2.…”

The effect of Mn and Al dopants on the β-FeSi2 stabilization by a two-step route: Mechanical alloying and annealing

“…For such applications, controlling the electrical conductivity of the system is critical, and the semiconductor needs to be doped to form either n-or p-type ␤-FeSi 2 . Additives like Pt [1,2], Mn [3][4][5] and Al [6][7][8] turn the material into a p-type semiconductor.…”