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Design, Synthesis and Properties of n-type Bi2Te3/BayNixCo4-xSb12 Graded Thermoelectric Material

Author: YangXiuLi
Tutor: TangXinFeng
School: Wuhan University of Technology
Course: Materials Science
Keywords: The gradient structure thermoelectric material Design Preparation Output power
CLC: TB34
Type: Master's thesis
Year: 2006
Downloads: 154
Quote: 0
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Abstract


This thesis were prepared by solid state reaction Ni x Co 4-x Sb 12 (x = 0.1,0.2,0.4) and Ba y Ni x Co 4-x Sb 12 (y = 0.16 ~ 0.35, x = 0.1 ~ 1.0) spark plasma sintering dense bulk material. Homogeneous materials of Bi 2 Te 3 and of Ba y the Ni x the Co. 4-x < / sub> the Sb 12 thermoelectric properties based on gradient structure thermoelectric materials Bi 2 Te 3 / Ba 0.35 < / sub> Ni 0.1 Co 3.9 the Sb 12 interface temperature was optimized, homogeneous materials which the the gradient structure thermoelectric material Bi 2 Te 3 and Ba 0.35 Ni 0.1 Co 3.9 Sb 12 the length of the optimized design. Prepared by the method of two-step spark plasma sintering gradient structure thermoelectric materials Bi 2 the Te 3 / Ba 0.35 Ni 0.1 Co 3.9 Sb 12 ; the study gradient structure of n-type Bi 2 Te 3 / Ba 0.35 Ni 0.1 Co 3.9 Sb 12 thermoelectric properties of thermoelectric materials. The main findings are as follows: 1. Co the Ni x 4-x Sb 12 (x = 0.1, 0.2 and 0.4) thermoelectric optimize performance and transmission performance, Ni 0.4 Co 3.6 Sb 12 sample at 800K performance of merit ZT value reaches a maximum 0.48. 2 the of Ni x the of Ba y the Co. 4-x the Sb 12 (y = 0 ~~ 0.4, x = 0.1 to 1.0), thermoelectric properties and transmission performance optimization, Ba 0.35 Ni 0.1 Co 3.9 Sb 12 sample at 800K maximum performance of merit ZT value 0.56. According to two homogeneous materials of Bi 2 Te 3 and Ba 0.35 Ni 0.1 Co 3.9 Sb 12 thermoelectric properties of merit and the temperature dependence of the gradient structure of n-Bi 2 Te 3 / Ba 0.35 Ni 0.1 Co 3.9 Sb 12 thermoelectric material interface temperature optimized, draw a gradient the structure Bi 2 < / sub> Te 3 / Ba 0.35 Ni 0.1 Co 3.9 Sb 12 thermoelectric material interface temperature of about 630K. 4 two homogeneous materials of Bi 2 Te 3 and Ba 0.35 Ni 0.1 Co 3.9 the Sb 12 thermal conductivity characteristics of Bi 2 Te 3 / Ba 0.35 Ni 0.1 Co 3.9 Sb 12 length theory of homogeneous material design thermoelectric materials obtained at 300K ~ 800K temperature range, homogeneous materials of Bi 2 Te 3 and Ba , 0.35 Ni 0.1 Co 3.9 Sb 12 optimal length ratio of 5.5:10. 5 Pd as the interface material without interface material, the use of two-step spark plasma sintering method a gradient structure Bi 2 Te 3 / Ba 0.35 Ni 0.1 Co 3.9 Sb 12 thermoelectric materials. SEM analysis of the results showed that: n-Bi 2 Te 3 / Ba 0.35 Ni 0.1 Co 3.9 Sb 12 gradient structure at the interface combined diffusion phenomenon is not serious, and the n-Bi 2 the Te 3 / Pd / Ba 0.35 Ni 0.1 Co 3.9 Sb 12 gradient structure combined at the interface is not ideal, the selected interface material not the best material. 6 model calculated the gradient structure n-type Bi 2 Te 3 / Ba 0.35 Ni 0.1 Co 3.9 Sb 12 of the internal resistance of the thermoelectric material, average Seebeck coefficient, output power, etc. The results show that: in a wider temperature range, compared to the homogeneous material Bi 2 Te 3 and Ba 0.35 Ni 0.1 Co 3.9 Sb 12 gradient structure of n-type

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