We report the effect of plastic deformation on the thermoelectric properties of n-type Bi2Te2.5Se0.5 compounds. N-type Bi2Te2.5Se0.5 powders are synthesized by an oxide-reduction process and consolidated via sparkplasma sintering. To explore the effect of plastic deformation on the thermoelectric properties, the sintered bodies are subjected to uniaxial pressure to induce a controlled amount of compressive strains (-0.2, -0.3, and -0.4). The shaping temperature is set using a thermochemical analyzer, and the plastic deformation effect is assessed without altering the material composition through differential scanning calorimetry. This strategy is crucial because the conventional hotforging process can often lead to alterations in material composition due to the high volatility of chalcogen elements. With increasing compressive strain, the (00l) planes become aligned in the direction perpendicular to the pressure axis. Furthermore, an increase in the carrier concentration is observed upon compressive plastic deformation, i.e., the donorlike effect of the plastic deformation in n-type Bi2Te2.5Se0.5 compounds. Owing to the increased electrical conductivity through the preferred orientation and the donor-like effect, an improved ZT is achieved in n-type Bi2Te2.5Se0.5 through the compressive-forming process.

1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusion
Acknowledgement
References

• 임영수(부경대학교 신소재시스템공학전공, 부경대학교 스마트그린기술융합공학과) | Young Soo Lim (Department of Materials System Engineering, Pukyong National University, Yongso-ro 45, Nam-gu, Busan 48513, Republic of Korea, Department of Smart Green Technology Engineering, Pukyong National University, Yongso-ro 45, Nam-gu, Busan 48513, Republic of Korea)
• 이길근(부경대학교 신소재시스템공학전공) | Gil-Geun Lee (Department of Materials System Engineering, Pukyong National University, Yongso-ro 45, Nam-gu, Busan 48513, Republic of Korea) Corresponding author