Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 48, Issue 7, Pages 4179-4187Publisher
SPRINGER
DOI: 10.1007/s11664-019-07182-x
Keywords
Thiospinel; CuCo2S4; thermoelectric; metallic; lattice thermal conductivity
Categories
Funding
- Natural Science Foundation of China [51272103, 51672127]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Eco-friendly thiospinel-type CuCo2S4 material has been investigated as a potential thermoelectric material. The temperature, T, dependence of electrical resistivity, , of CuCo2S4 shows a metallic conductivity (/T>0) and a strong degenerate state, in the range of 323-723K. Besides a high carrier concentration consistent with the metallic nature, its Hall mobility is still unexpectedly estimated to be 8.5cm(2)V(-1)s(-1) at room temperature. The positive Seebeck coefficient S confirms a p-type carrier conduction. Similar to most of the transition-metal spinel chalcogenides, the S value is very low, 12-36VK(-1) at 323-723K. As a result, a relatively low power factor PF &!thinsp;approximate to 0.35mWm(-1)K(-2) was obtained at 723K. Due to the dominant role of electronic thermal conductivity, the total thermal conductivity k was high and increases with a linear dependence on T. However, the intrinsic lattice conductivity k(l) was relatively low, ranging from 1.48Wm(-1)K(-1) at 323K to 0.57Wm(-1)K(-1) at 723K. It follows there is a T-1 dependence indicative of Umklapp type phonon-phonon interaction. Importantly, the intrinsically low k(l) in CuCo2S4 is attributed to multiple mechanisms, mainly including the large unit cell with primarily octahedral coordination, the high distortion and complexity of the structure, and additional interfacial thermal resistance.
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