Preparation and thermoelectric performance of nano rare-earth oxides …
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논문명 | Preparation and thermoelectric performance of nano rare-earth oxides dispersed p-type BiSbTe alloys by mechanical milling and spark plasma sintering |
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저자 | Babu Madavali, Dong-won Shin, Sung Ho Song, Dong-soo Kim, Jin Kyu Lee, Soon-Jik Hong |
저널명 | Materials Chemistry and Physics |
게재년월 | 2020/6/10 |
Vol. pp |
Simultaneously, the enhancement of power factor and reduction in thermal conductivity is a critical issue to
improve the thermoelectric performance of a certain material. In the present work, the rare earth oxide, Pr6O11
was added to the Bi-Sb-Te material and the corresponding thermoelectric properties have been systematically
investigated. The Seebeck coefficient was slightly improved due to the increase in effective mass by addition of
rare earth oxides in BiSbTe matrix. The electrical conductivity was decreased with increasing rare earth oxide
content due to the decreasing mobility owing to the carrier scattering at grain boundaries. The thermal conductivity was reduced of 8% for Pr6O11/BiSbTe composites in which the 4 wt% added Pr6O11 particles, act as a
scattering center for middle to higher wavelength phonons and induce the phonon scattering. As a result, the
maximum thermoelectric figure of merit, ZT of 0.71 was obtained for 2 wt% added BiSbTe/Pr6O11 composites at
350 K.