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Electrical Polarization Effect on Bi2Ca2Co1.7Ox thermoelectrics grown by laser floating zone

Published online by Cambridge University Press:  28 September 2012

N. M. Ferreira ,
Sh. Rasekh ,
A. J. S. Fernandes ,
F. M. Costa ,
M. A. Madre ,
J. C. Diez  and
A. Sotelo
N. M. Ferreira
Affiliation:
I3N, Dep. of Physics, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
Sh. Rasekh
Affiliation:
ICMA (CSIC-Universidad de Zaragoza), Dpt. Ciencia de Materiales, Maria de Luna, 3. 50018 Zaragoza, Spain
A. J. S. Fernandes
Affiliation:
I3N, Dep. of Physics, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
F. M. Costa
Affiliation:
I3N, Dep. of Physics, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
M. A. Madre
Affiliation:
ICMA (CSIC-Universidad de Zaragoza), Dpt. Ciencia de Materiales, Maria de Luna, 3. 50018 Zaragoza, Spain
J. C. Diez
Affiliation:
ICMA (CSIC-Universidad de Zaragoza), Dpt. Ciencia de Materiales, Maria de Luna, 3. 50018 Zaragoza, Spain
A. Sotelo
Affiliation:
ICMA (CSIC-Universidad de Zaragoza), Dpt. Ciencia de Materiales, Maria de Luna, 3. 50018 Zaragoza, Spain

Abstract

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Thermoelectric ceramic materials for practical applications must present high thermopower and relatively low electrical resistivity along with high chemical stability at high temperatures. These properties can be found in thermoelectric ceramics, for example in misfit cobaltites. These materials possess a high crystallographic anisotropy which is reflected on their thermoelectric properties. Therefore, controlling their grains orientation is mandatory in order to achieve better performance for practical applications. In this perspective, texturing methods can play an important role for enhancing the final properties of the bulk materials.

Type
Materials Sciences
Information
Microscopy and Microanalysis , Volume 18 , Supplement S5: Portuguese Supplement , August 2012 , pp. 93 - 94
Copyright
Copyright © Microscopy Society of America 2012