Full dense CoSb3 single phase with high thermoelectric performance prepared by oscillated cooling method. (1st March 2016)

• Record Type: Journal Article
• Authors: Alinejad, Babak; Castellero, Alberto; Baricco, Marcello
• Is Part Of: Scripta materialia. Volume 113(2016)
• Page Start: 110
• Page End: 113
• Publication Date: 2016-03-01
• Subjects: Peritectic solidification -- Thermoelectric materials -- Crystallization -- Microstructure -- Full dense; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.10.029
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A new mechanism is established for preventing porosity formation in the microstructure of CoSb3 phase during peritectic solidification. Phase and microstructure analysis at different stages of solidification revealed that oscillated cooling could hinder spontaneous nucleation, improve homogenous nucleation, limit the number of primary grains and impose planar growth. These factors enhance melt flux during peritectic solidification and prevent porosity formation due to phase transformation contraction. By utilizing this method, dense single phase of CoSb3 could be obtained in single batch process without any post-treatment. The highest power factor of 55 μWcm − 1 K − 2 and figure of merit of 1.33 were obtained at 550 °C. Graphical abstract: