Nanoparticles of PbTe are prepared via chemical reaction of the equimolar aqueous solutions of Pb(CH3COO)2 and Te at 120°C. The size of the obtained particles is 100 nm after calcination in a hydrogen atmosphere. Dense specimens for the thermoelectric characterization are produced by spark plasma sintering of prepared powders at 400°C to 500°C under 80 MPa for 5 min. The relative densities of the prepared specimens reach approximately 97% and are identified as cubic based on X-ray diffraction analyses. The thermoelectric properties are evaluated between 100°C and 300°C via electrical conductivity, Seebeck coefficient, and thermal conductivity. Compared with PbTe ingot, the reduction of the thermal conductivities by more than 30% is verified via phonon scattering at the grain boundaries, which thus contributes to the increase in the figure of merit.

Abstract
 1. 서 론
 2. 실험 방법
  2.1. 나노 PbTe 분말 제조
  2.2. PbTe 소결
  2.3. 특성평가
 3. 결과 및 고찰
 4. 결 론
 References

• 전은영(엘앤에프) | Eun-Young Jun (L&F Co. ltd.)
• 김호영(DGIST) | Ho-Young Kim (Magnet Controlled Materials Research Group, DGIST)
• 김 참(DGIST) | Cham Kim (Magnet Controlled Materials Research Group, DGIST)
• 오경식(국립안동대학교 신소재공학부, 친환경신소재산업지원센터) | Kyung-Sik Oh (School of Advanced Materials Engineering, Industrial Technology Center for Environment-friendly Materials, Andong National University)
• 정태주(국립안동대학교 신소재공학부, 친환경신소재산업지원센터) | Tai-Joo Chung (School of Advanced Materials Engineering, Industrial Technology Center for Environment-friendly Materials, Andong National University) Corresponding Author