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The Bi and the Te nano-powders are prepared by inert gas protected evaporation-condensation method; the n-type Bi2Te3 bulk materials with nano-layer and twin crystallite sub-structures are then synthesized by mechanical alloying and spark plasma sintering technique. The effects of grain size and microstructure on thermoelectric property are also systematically studied. The SEM and the TEM analyseis show that the nano-layered Bi2Te3 bulk materials with twin crystallite sub-structures could be fabricated by controlling the preparing procedures. The thermoelectric property result shows that the thermal conductivity is lowered compared with that of bulk material of coarse-grained starting powders. The thermal conductivity decreases from 1.80 W/mK to 1.19 W/mK at 423 K, the lattice thermal conductivity decreases from 1.16 W/mK to 0.61 W/mK at 423 K, indicating that the phonon scattering could be enhanced due to the coexistence of nano-layer and twin crystallite sub-structures, leading to reduced phonon thermal conductivity. The dimensionless figure of merit ZT reaches 0.74 at 423 K for bulk materials sintered at 693 K.
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Keywords:
- Bi2Te3 alloy /
- size effect /
- thermoelectric conductivity /
- thermoelectric properties
[1] Ahmed S A, Ibrahim E M M, Saleh S A 2006 J. App. Phys. A: Mater. Sci. Pro. 85 177
[2] Liu W S, Zhang B P, Li J F, Liu J 2006 Acta Phys. Sin. 55 465 (in Chinese) [刘玮书, 张波萍, 李敬锋, 刘静 2006 55 465]
[3] CuieJ L, Xiu W J, Mao L D, Ying P Z, Jiang J, Qian X 2007 J. Solid Sotae Chem. 180 1159
[4] Ferhat M, Brun G, Tedenac J C, Nouaoura M, Lassabatere L 1996 J. Ciyst. Growth 167 122
[5] Wang S Y, Xie W J, Li H, Tang X F 2010 Acta Phys. Sin. 59 8927 (in Chinese) [王善禹, 谢文杰, 李涵, 唐新峰 2010 59 8927]
[6] Zhao X B, Ji X H, Zhang Y H, Zhu T J, Tu J P, Zhang X B 2005 Appl. Phys. Lett. 86 062111
[7] Tang X F, Xie W J, Li H, Zhao W Y, Zhang Q J 2007 Appl. Phys. Lett. 90 012102
[8] Zhang X, Lu Q M, Wang L 2010 J. Electr. Mater, 39 1413
[9] Song X Y, Zhang J X, Yue M 2006 Adv. Mater. 18 1210
[10] Jiang J, Chen L D, Bai S Q 2005 Mater. Sci. Eng. B 117 334
[11] Zhang X, Zhang J X, Lu Q M, Liu Y Q 2005 J. Japan. Metals 69 497
[12] Caillat H, Borshchevsky A, Fleurial J P 1996 J. Appl. Phys. 80 4442
[13] Poudel B, Hao Q, Ma Y 2008 Science 320 634
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[1] Ahmed S A, Ibrahim E M M, Saleh S A 2006 J. App. Phys. A: Mater. Sci. Pro. 85 177
[2] Liu W S, Zhang B P, Li J F, Liu J 2006 Acta Phys. Sin. 55 465 (in Chinese) [刘玮书, 张波萍, 李敬锋, 刘静 2006 55 465]
[3] CuieJ L, Xiu W J, Mao L D, Ying P Z, Jiang J, Qian X 2007 J. Solid Sotae Chem. 180 1159
[4] Ferhat M, Brun G, Tedenac J C, Nouaoura M, Lassabatere L 1996 J. Ciyst. Growth 167 122
[5] Wang S Y, Xie W J, Li H, Tang X F 2010 Acta Phys. Sin. 59 8927 (in Chinese) [王善禹, 谢文杰, 李涵, 唐新峰 2010 59 8927]
[6] Zhao X B, Ji X H, Zhang Y H, Zhu T J, Tu J P, Zhang X B 2005 Appl. Phys. Lett. 86 062111
[7] Tang X F, Xie W J, Li H, Zhao W Y, Zhang Q J 2007 Appl. Phys. Lett. 90 012102
[8] Zhang X, Lu Q M, Wang L 2010 J. Electr. Mater, 39 1413
[9] Song X Y, Zhang J X, Yue M 2006 Adv. Mater. 18 1210
[10] Jiang J, Chen L D, Bai S Q 2005 Mater. Sci. Eng. B 117 334
[11] Zhang X, Zhang J X, Lu Q M, Liu Y Q 2005 J. Japan. Metals 69 497
[12] Caillat H, Borshchevsky A, Fleurial J P 1996 J. Appl. Phys. 80 4442
[13] Poudel B, Hao Q, Ma Y 2008 Science 320 634
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