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Improvement of grain alignment in Bi2Sr2Co1.8Oy thermoelectric through the electrically assisted laser floating zone

AuthorsFerreira, N. M.; Madre, M. A.; Torres, M. A. ; Davarpanah, A.; Amaral, Vitor S.; Costa, F. M.; Sotelo, A.
Issue Date2020
CitationMaterials Research Bulletin 130: 110933 (2020)
AbstractThermoelectric performances of cobaltite ceramics were improved by increasing grain sizes and alignment through the Electrically Assisted Laser Floating Zone method. Bi2Sr2Co1.8Oy ceramics were directionally grown at 30 mm/h, applying external DC (0-500 mA) during the growth process. Microstructure and thermoelectric properties are significantly influenced by the external current direction and intensity. Negative currents/pole on the seed rod prevent the formation of thermoelectric phase, while positive pole on the seed rod, decreases the amount of secondary phases and increase grain orientation when compared to samples grown without current. Annealing procedure decreases secondary phases content, without modifying grain alignment. The best thermoelectric performances were obtained for samples grown with +300 mA, reaching the highest ZT values of 0.09 at 650 °C. Moreover, it should be highlighted that these processed samples can be directly applied in thermoelectric modules, avoiding the long and expensive steps necessary when other preparation processes are used.
Publisher version (URL)https://doi.org/10.1016/j.materresbull.2020.110933
Appears in Collections:(ICMA) Artículos
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