Crystal structure and thermoelectric performance of petype Bi0.86Ba0.14CuSeO/Cu2eySe composites
- Crystal structure and thermoelectric performance of petype Bi0.86Ba0.14CuSeO/Cu2eySe composites
- 원성옥; H.Y. Hong; D.H. Kim; J.K. Lee; S.D. Park; S.-M. Choi; S.H. Bae; K. Park
- Ceramics; Oxide materials; Electrical transport; Microstructure; Thermoelectric; XRD; Rietveld refinement
- Issue Date
- JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
- VOL 13-905
- 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.
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