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Effects of doping elements in β-FeSi2 prepared utilizing cast iron scrap chips

Nor Hairin, Assayidatul Laila and Nanko, Makoto and Takeda, Masatoshi (2016) Effects of doping elements in β-FeSi2 prepared utilizing cast iron scrap chips. Materials Transactions, 57 (3). pp. 445-451. ISSN 1345-9678 E-ISSN 1347-5320

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Abstract

In this work, the thermoelectric properties of p- and n-type β-FeSi2, prepared utilizing cast iron scrap chips, have been characterized by measuring the Seebeck coefficient, electrical conductivity and thermal conductivity at temperatures ranging from room temperatures to 800°C. In a previous study, the upgrade recycling of cast iron scrap chips into β-FeSi2 thermoelectric materials was proposed as an eco-friendly and costeffective production process. By doping with different substitution concentrations of Co, Mn and Al, the conduction type and properties of β-FeSi2 can be modified and improved using cast iron scrap chips as a starting material. The effects of the doping elements are discussed for preparing β-FeSi2 utilizing cast iron scrap chips. Cast iron scrap chips could be preferable as a starting material to replace pure Fe for n- and ptype β-FeSi2 thermoelectric materials. An optimum composition for n-type β-FeSi2 0.94C.I.-0.06Co-1.86Si shows that the largest ZT value of 0.22 occurs at 700°C, whereas for p-type β-FeSi2 0.92C.I.-0.08Mn-1.86Si, the largest ZT value of 0.17 occurs at 800°C.

Item Type: Article (Journal)
Additional Information: 7683/56418
Uncontrolled Keywords: materials recycling, cast iron scrap chips, thermoelectric performance, β-FeSi2
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401 Materials of engineering and construction
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User: Mrs Suhani Saarani
Date Deposited: 25 Apr 2017 11:55
Last Modified: 04 Oct 2017 08:51
URI: http://irep.iium.edu.my/id/eprint/56418

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