| 학회 | 한국재료학회 |
| 학술대회 | 2012년 가을 (11/07 ~ 11/09, 라카이샌드파인 리조트) |
| 권호 | 18권 2호 |
| 발표분야 | A. 전자/반도체 재료(Electronic and Semiconductor Materials) |
| 제목 | Effects of Hydrogen Reduction Temperature on the Thermoelectric Properties of p-type TAGS-85: (AgSbTe2)15-(GeTe)85 Compounds |
| 초록 | Effects of Hydrogen Reduction Temperature on the Thermoelectric Properties of p-type TAGS-85: (AgSbTe2)15-(GeTe)85 Compounds Seung-Taek Han, Hyo-Seob Kim, and Soon-Jik Hong Division of Advanced Materials Engineering, Kongju National University, 275, Budae-dong Cheonan, Chungnam, 331-717, South Korea P-type TAGS-85: (AgSbTe2)15-(GeTe)85 compounds were prepared by spark plasma sintering(SPS) using gas atomized powders. The effects of reduction temperature (623K, 673K, 723K) on the microstructure and thermoelectric properties of the resultant materials were measured over the temperature range from 300K to 750K. The microstructure of the powders and sintered sample were examined by both scanning electron microscopy (SEM) and optical microscopy (OM). After hydrogen reduction, the oxygen concentration of the powders for each reduction condition was measured by nitrogen/oxygen determinator. The phases of powders and sintered sample were characterized by X-ray diffraction (XRD). The Seebeck coefficient (α) and electrical resistivity (ρ) were measured using the thermoelectric measurement system (TEP1000) at room temperature to 723K, respectively. Powder factor (PF) was calculated using the relationship, PF=α2ρ. With increasing reduction temperature, grain size of powders quickly increased and the oxygen concentrations of the powders decreased from 0.17% at 623K to 0.11% at 723K, respectively, due to hydrogen reduction. The power factor(PF) of the sintered p-type TAGS-85 compounds by using hydrogen-reduced powders increased from 2.6 to 3.3 at 723K with reduction temperature. However, resultant power factor of the reduced thermoelectric compounds are believed to be not significantly affected by hydrogen reduction. |
| 저자 | 한승택, 김효섭, 홍순직 |
| 소속 | 공주대 |
| 키워드 | TAGS-85; reduction; Hydrogen |
