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conferenceseries
.com
Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Ceramics 2018
May 14-15, 2018
May 14-15, 2018 | Rome, Italy
4
th
International Conference and Expo on
Ceramics and Composite Materials
Microstructure and thermoelectric properties of Sr
0.9
La
0.1
TiO
3
ceramics with nano-sized metal
particles as additive
Mengjie Qin, Gaogao Dong, Jie Xu, Yi Zhang
and
Feng Gao
Northwestern Polytechnical University, China
S
r
0.9
La
0.1
TiO
3
thermoelectric ceramics with nano-sized Ag (Sr
0.9
La
0.1
TiO
3
/xAg, x=0.05, 0.10, 0.15, 0.20) and Ti (Sr
0.9
La
0.1
TiO
3
/
yTi, y=0.05, 0.10, 0.15, 0.20, 0.30, 0.40) metal particles as additives were prepared by conventional solid state reactionmethod,
and the influences of metal particles adding content on the microstructure and thermoelectric properties were investigated.
XRD characterization confirmed that the main phase was perovskite Sr
0.9
La
0.1
TiO
3
, along with a small amount of metal phase.
SEM images showed that all of the samples were dense, and the metal particles accumulated at the grain boundaries, to form a
complex network, contributing to increasing the electrical conductivity. Raman spectra of samples before and after annealing
in Ar+C atmosphere showed a great difference, resulting from the creation of oxygen vacancies and changes in the Ti-O
bond vibration and rotation modes. Adding nano-sized metal particles can increase the electrical conductivity and improve
thermoelectric properties effectively. The maximum
ZT
value of 0.37 was obtained for Sr
0.9
La
0.1
TiO
3
/0.30Ti samples at 1073
K, accompanying with the relative high Seebeck coefficient of -336 μV/K and low thermal conductivity of 2.14 W/m/K. This
work suggested a route for using nano-sized metal particles to enhance the thermoelectric properties of oxide thermoelectric
ceramics.
qinmengjie_2014@126.comRes. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C1-015