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conferenceseries
.com
Volume 08
Innovative Energy & Research
ISSN: 2576-1463
Advanced Energy Materials 2019
July 11-12, 2019
July 11-12, 2019 | Zurich, Switzerland
21
st
International Conference on
Advanced Energy Materials and Research
Ceramic based thermoelectric materials processed by laser
N M Ferreira
1
, M A Madre
2
, A Sotelo
2
, A V Kovalevsky
1
and
F M Costa
1
1
Universidade de Aveiro, Portugal
2
ICMA, CSIC-Universidad de Zaragoza, Spain
T
oday a particular interest is given to the oxide-based thermoelectric materials, due to enhanced thermal and
redox stability, attractive properties at high temperature, together with the absence of toxicity, and natural
abundance of the constituent compounds. The objective of this work is to assess the possibilities for processing oxide
thermoelectrics through laser floating zone (LFZ) method, including identification of the appropriate treatment
conditions and main structural and microstructural factors affecting the thermoelectric performance. Known that
Nb and La substituted calciummanganite-based materials possesses promising thermoelectric properties, they were
selected as a model system. Detailed structural (XRD) and microstructural (SEM/EDS) studies were performed for
the samples grown at various pulling rates. The results on electrical conductivity, Seebeck coefficient and thermal
conductivity indicate that high thermoelectric performance can be triggered by laser processing. Effects of pulling
rate, dopants nature and thermal treatment to the fibres on that properties are discussed, suggesting that careful
optimization of the laser treatment conditions is necessary, when seeking high thermoelectric performance in oxides
by LFZ processing.
Recent Publications
1. N M Ferreira, F M Costa, A V Kovalevsky, M A Madre, M A Torres, J C Diez and A Sotelo (2018) New
environmentally friendly Ba-Fe-O thermoelectric material by flexible laser floating zone processing. Scripta
Materialia 145:54–57.
2. N M Ferreira, M C Ferro, A R Sarabando, A Ribeiro, A Davarpanah, V Amaral, M A. Madre, A V Kovalevsky,
M A Torres, F M Costa and A Sotelo (2018) Improvement of thermoelectric properties of Ca0.9Gd0.1MnO
3
by
powder engineering through K
2
CO
3
additions. Journal of Materials Science 54:3252–3261.
3. Kovalevsky AV, Aguirre MH, Populoh S, Patrício S G, Ferreira NM, Mikhalev S M, Fagg D P, Weidenkaff A and
Frade J R (2017) Designing strontium titanate-based thermoelectrics: insight into defect chemistry mechanisms.
Journal of Materials Chemistry A, 5(8):3909-3922.
4. A Sotelo, F M Costa, N M Ferreira, A Kovalevsky, M C Ferro, V S Amaral, J S Amaral, S Rasekh, M A Torres,
M A Madre and J C Diez (2016) Tailoring Ca
3
Co
4
O
9
microstructure and performances using a transient liquid
phase sintering additive. J. Eur. Ceram. Soc. 36 1025.
N M Ferreira et al., Innov Ener Res 2019, Volume 08