Tuning thermoelectric properties of Ca(0.9)Gd(0.1)MnO(3)by laser processing
authors Ferreira, NM; Sarabando, AR; Ferro, MC; Madre, MA; Dura, OJ; Sotelo, A
nationality International
abstract Donor-doped CaMnO(3)is ann-type semiconductor with perovskite structure, being considered as a potentialn-type leg in thermoelectric modules. This oxide presents stability at high temperatures and allows tuning the relevant electrical and thermal transport properties through doping. In this work, Ca(0.9)Gd(0.1)MnO(3)precursors have been prepared to produce fibres through the laser floating zone technique using different pulling rates. However, as-grown fibres did not present thermoelectric properties due to the presence of high amounts of secondary phases, leading to very high electrical resistivity values. The results have highlighted the importance of annealing procedures to reduce electrical resistivity, due to the decrease of secondary phases amount, and producing promising thermoelectric performances. The annealed samples present higher ZT values when the growth rate is decreased, reaching around 0.22 for the lowest growth rate, which is very close to the best values reported in the literature for these materials. Moreover, this procedure possesses an additional advantage considering that these samples can be directly used asn-type legs in thermoelectric modules for high-temperature applications. However, further studies should be made to determine the optimal amount of dopant.
publisher SPRINGER
issn 0957-4522
isbn 1573-482X
year published 2020
volume 31
issue 21
beginning page 18913
ending page 18922
digital object identifier (doi) 10.1007/s10854-020-04428-x
web of science category Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter
subject category Engineering; Materials Science; Physics
unique article identifier WOS:000570042000002
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 2.22
5 year journal impact factor 2.078
category normalized journal impact factor percentile 48.512
dimensions (citation analysis):
altmetrics (social interaction):