Crystal structure and thermoelectric performance of petype Bi0.86Ba0.14CuSeO/Cu2eySe composites

Title
Crystal structure and thermoelectric performance of petype Bi0.86Ba0.14CuSeO/Cu2eySe composites
Authors
원성옥H.Y. HongD.H. KimJ.K. LeeS.D. ParkS.-M. ChoiS.H. BaeK. Park
Keywords
Ceramics; Oxide materials; Electrical transport; Microstructure; Thermoelectric; XRD; Rietveld refinement
Issue Date
2021-07
Publisher
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Citation
VOL 13-905
Abstract
Bi0.86Ba0.14CuSeO/xCu2?ySe (0.05 ≤ x ≤ 0.15; y = 0 and 0.2) composites were fabricated by spark plasma sintering, and the crystal structure and thermoelectric properties of the Bi0.86Ba0.14CuSeO/xCu2?ySe composites were studied. The composites contained Cu2?ySe (y = 0 and 0.2) nanoinclusions in a tetragonal Bi0.86Ba0.14CuSeO matrix. To increase the electrical conductivities of Bi0.86Ba0.14CuSeO, we introduced Cu2?ySe nanoinclusions with a high electrical conductivity into the matrix. The introduction of Cu2?ySe nanoinclusions reduced the structural distortion of CuSe4 tetrahedra and the effective mass, thereby enhancing the carrier mobility. A significant increase in electrical conductivities was achieved with increasing Cu2?ySe nanoinclusion, i.e., 117, 165, and 214 Ω?1cm?1 at 673 K for x = 0.05, 0.10, and 0.15 composites. The Cu2?ySe nanoinclusions reduced the lattice thermal conductivity because they strengthened the long?wavelength phonon scattering at the Bi0.86Ba0.14CuSeO/Cu2?ySe interface. The largest dimensionless figure?of?merit (0.33 at 673 K) was obtained for x = 0.15 composite, which was attributed to the highest electrical conductivity and the lowest lattice thermal conductivity.
URI
http://pubs.kist.re.kr/handle/201004/73470
ISSN
2238-785
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