Growth rate effects on the thermoelectric performance of CaMnO3-based ceramics
authors Ferreira, NM; Neves, NR; Ferro, MC; Torres, MA; Madre, MA; Costa, FM; Sotelo, A; Kovalevsky, AV
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords Oxide thermoelectrics; Calcium manganite; Laser processing; Thermoelectric performance; Electrical properties
keywords ELECTRICAL-PROPERTIES; MICROSTRUCTURE; CAMNO3-DELTA; FIBERS; BI
abstract CaMnO3-based materials represent a promising family of n-type oxide thermoelectrics. The objective of the present work is assessing the impacts on relevant structural, microstructural and thermoelectric properties of manganites when they are processed by the laser floating zone technique. For this purpose, donor-doped Ca0.9La0.1MnO3, CaMn0.93Nb0.05O3 and undoped CaMnO3 were used. Different growth conditions have been evaluated through combined studies of structural, microstructural, and thermoelectric characteristics. Despite the presence of secondary phases, electrical resistivity is among the best reported in the literature (9 m Omega.cm at 800 degrees C for La-doped materials grown at 200 mm/h). Essentially high absolute Seebeck coefficient of 320 mu V/K at 800 degrees C was observed for undoped samples grown at 10 mm/h. Power factor is significantly affected by the growth conditions, reaching the highest values when using the lowest pulling rates. Exceptionally high PF (0.39 mW/K(2)m at 800 degrees C) was obtained for undoped CaMnO3 samples grown at 10 mm/h.
publisher ELSEVIER SCI LTD
issn 0955-2219
isbn 1873-619X
year published 2019
volume 39
issue 14
beginning page 4184
ending page 4188
digital object identifier (doi) 10.1016/j.jeurceramsoc.2019.06.011
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000476965000030
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