Improved process for synthesizing n-type and p-type β-FeSi2 thermoelectric material from attritor milled powder. (2021)

• Record Type: Journal Article
• Authors: Poddar, V.S.; Dhokey, N.B.; Butee, S.P.; Walimbe, A.N.; Gaikwad, P.D.; Vhora, S.; Roy, Debanik; Prakash, Deep; Purohit, R.D.; Sinha, R.K.
• Is Part Of: Materials today. Volume 43(2021)Part 5
• Page Start: 3156
• Page End: 3160
• Publication Date: 2021
• Subjects: Thermoelectric -- Semiconductor -- Iron disilicide -- Attritor -- Sintering; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2021.01.655
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Semiconducting iron disilicide, β-FeSi2, has its application in thermoelectric generators using p-type and n-type semiconducting β-FeSi2 . It is useful for energy conversion (waste heat energy to electrical energy) in the temperature range between 200 and 900 °C. The peritectoid and eutectoid reaction responsible in the formation of β-FeSi2 phase are very sluggish. This research work focuses on shortening of sintering period and thus conserving energy required for complete transformation of various phases to β-FeSi2 . Total time required for the synthesis along with the sintering cycle is relatively less (about 20 h) than the other processes (other process durations varying from 37 h to 504 h) studied earlier. An innovative sintering cycle was developed to achieve nearly complete β-FeSi2 phase formation. p-type and n-type semiconducting β-FeSi2 were characterized for thermoelectric properties.