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Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Advanced Materials 2018
September 04-06, 2018
September 04-06, 2018 | Zürich, Switzerland
21
st
International Conference on
Advanced Materials & Nanotechnology
Enhancement of thermoelectric properties in mechanically alloyed Bi
0.4
Sb
1.6
Te
3
bulk nanocomposite
containing Ti
50
Cu
28
Ni
15
Sn
7
amorphous particles
Pee-Yew Lee
Institute of Materials Engineering-NTOU, Taiwan
D
uring mechanical alloying of Bi, Sb and Te elemental powder mixture, the Bi
0.4
Sb
1.6
Te
3
compound phase can be obtained
after 2 hours of mechanical alloying treatment.The as-milled Bi
0.4
Sb
1.6
Te
3
powders were further mixing with Ti
50
Cu
28
Ni
15
Sn
7
amorphous particles to form Ti
50
Cu
28
Ni
15
Sn
7
/Bi
0.4
Sb
1.6
Te
3
composite powders after 30 minutes ball milling. The Ti
50
Cu
28
Ni
15
Sn
7
/
Bi
0.4
Sb
1.6
Te
3
composite powders were consolidated into bulk samples with a diameter of 20 mm and thickness of 10mm by using
vacuum hot pressing. The nano-/microstructured structure were observed for Ti
50
Cu
28
Ni
15
Sn
7
/Bi
0.4
Sb
1.6
Te
3
bulk samples. TEM
bright-field image shows that the Ti
50
Cu
28
Ni
15
Sn
7
amorphous phase with particle size of about 50 nm were homogeneously
distributed along the grain boundary of Bi
0.4
Sb
1.6
Te
3
matrix with grain size around 0.5~2.0 μm. The thermoelectric properties
of Ti
50
Cu
28
Ni
15
Sn
7
/Bi
0.4
Sb
1.6
Te
3
samples were measured. The results indicated, either use high purity (99.999%) or low purity
(99.5%) Sb and Te as starting materials, the values of figure of merit (ZT) for the Ti
50
Cu
28
Ni
15
Sn
7
/Bi
0.4
Sb
1.6
Te
3
bulk composite
samples were found to increase with temperature in the range from 298 K to 580 K. It is the first time that such specific behavior
has been observed. For 3 wt.% amorphous Ti
50
Cu
28
Ni
15
Sn
7
/Bi
0.4
Sb
1.6
Te
3
specimen use high purity Sb and Te powders as starting
materials, the maximum ZT value is only 0.9 at 473 K but is expected to reach 1.18 when the ZT curve is extended from 473K
to 580K. For 1.75 wt. % amorphous Ti
50
Cu
28
Ni
15
Sn
7
/Bi
0.4
Sb
1.6
Te
3
specimen fabricated from low purity Sb and Te powders, the
maximum ZT value is 1.08 at 580 K, which is the highest ZT values among the existing typical low temperature thermoelectric
materials has been measured at 580 K.
pylee@ntou.edu.twRes. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C3-021