Year: 2018
Type: article
Abstract: P-type Ce/Yb-filled skutterudites were synthesized, and their charge transport and thermoelectric properties were investigated with partial double filling and charge compensation.In the case of (Ce 1- z Yb z ) 0.8 Fe 4 Sb 12 without Co substitution, the marcasite (FeSb 2 ) phase formed alongside the skutterudite phase, but the generation of the marcasite phase was inhibited by increasing Co concentration.The electrical conductivity decreased with increasing temperature, exhibiting degenerate semiconductor behavior.The Hall and Seebeck coefficients were positive, which confirmed that the specimens were p-type semiconductors with holes as the major carriers.The carrier concentration decreased as the concentration of Ce and Co increased, which led to decreased electrical conductivity and increased Seebeck coefficient.The thermal conductivity decreased due to a reduction in electronic thermal conductivity via Co substitution, and due to decreased lattice thermal conductivity via double filling of Ce and Yb.(Ce 0.25 Yb 0.75 ) 0.8 Fe 3.5 Co 0.5 Sb 12 exhibited the greatest dimensionless figure of merit (ZT = 0.66 at 823 K).
Source: 대한금속재료학회지
Authors: Deok-Yeong Choi, Ye-Eun Cha, Il-Ho Kim
Institution: Korea National University of Transportation
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W2900685385