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conferenceseries
.com
Volume 7
Innovative Energy & Research
ISSN: 2576-1463
Advanced Energy Materials 2018
August 13-14, 2018
August 13-14, 2018 | Dublin, Ireland
20
th
International Conference on
Advanced Energy Materials and Research
Laser processing of thermoelectric oxides
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
C
eramic oxides are very promising materials for thermoelectric devices, as they exhibit high Seebeck coefficient and could
present relatively low electrical resistivity, as well as high chemical stability at high temperatures. Several oxides exhibit
anisotropic thermoelectric properties linked to their layered structures. Therefore, texturing methods developing a preferential
grain orientation, like the directional growth from the melt, are suitable to enhance the relevant physical properties. These
methods have already shown their applicability to this kind of compounds and also in high Tc superconductor materials,
namely, through the use of laser floating zone (LFZ) technique. The LFZ process has demonstrated its suitability for the
Co-oxide based thermoelectric materials, processed in the last years in our laboratories. In this work, some examples of the
versatility and usefulness of the LFZ technique are shown. The LFZ technique allows obtaining very dense, homogeneous and
well textured thermoelectric composites. The results put in evidence an improvement due to electrically assisted laser floating
zone on the thermoelectric performances when compared with materials processed by LFZ and by conventional techniques.
Recent Publications
1. A V Kovalevsky, AMyriam, S Populoh, S Patrício, NM Ferreira, S Mikhalev, D Fagg, AWeidenkaff and J R Frade (2016)
Designing strontium titanate-based thermo electrics: An insight into defect chemistry mechanisms. Journal of Materials
Chemistry A 5:3909-3922.
2. 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. Journal of the European Ceramic Society 36(4):1025-1032.
3. M A Madre, F M Costa, NM Ferreira, S I R Costa, S Rasekh, M A Torres, J C Diez, V S Amaral, J S Amaral and A Sotelo
(2016) High thermoelectric performance in Bi
2
-xPbxBa
2
CO
2
Ox promoted by directional growth and annealing. Journal
of the European Ceramic Society 36(1):67-74.
4. Rasekh, F M Costa, N M Ferreira, M A Torres, M A Madre, J C Diez and A Sotelo (2015) Use of laser technology to
produce high thermoelectric performances in Bi
2
Sr
2
Co
1.8
O
x
. Materials and Design 75:143–148.
5. F M Costa, N M Ferreira, S Rasekh, A J S Fernandes, M A Torres, M A Madre, J C Diez and A Sotelo (2015) Very large
superconducting currents induced by growth tailoring. Crystal Growth and Design 15(5):2094–2101.
Biography
N M Ferreira is a PhD in Physics Engineering (2014), currently is a Post-Doc Researcher at i3N, Physics Department and CICECO, Department of Materials and Ceramic
Engineering at University of Aveiro, Portugal. He participated as a collaborator and research fellow in several R&D projects on material science. He is an experienced
researcher in study and development of ceramics-based materials, prepared through conventional methods (melting, solid stated), with particular focus on laser processing
(crystal growth – LFZ and surface sintering). Present sample characterization skills include various techniques such as, electrical conductivity and magnetic properties
of various oxide materials. Current focus materials: thermoelectrics, ferroelectrics and glass matrices doped with transition metals and rare earth for energy storage and
conversion applications. Main expertise is related to structural, magnetic and electrical properties of materials prepared by laser processing.
nmferreira@ua.ptN M Ferreira et al., Innov Ener Res 2018, Volume 7
DOI: 10.4172/2576-1463-C1-002