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Enhancement of electrical conductivity of Ca 2.93 Sr 0.07 Co 4 O 9 thick films via hot uniaxial pressing
Author(s) -
Mora Mario,
Amaveda Hippolyte,
Torres Miguel A.,
Madre Maria A.,
Marinel Sylvain,
Sotelo Andres
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13343
Subject(s) - materials science , seebeck coefficient , electrical resistivity and conductivity , hot pressing , sintering , grain size , thermoelectric effect , composite material , doping , hall effect , pressing , dip coating , analytical chemistry (journal) , mineralogy , coating , thermal conductivity , optoelectronics , electrical engineering , chemistry , physics , engineering , thermodynamics , chromatography
Sr‐doped Ca 3 Co 4 O 9 thermoelectric thick films have been prepared by dip‐coating technique, followed by sintering and hot uniaxial pressing. XRD patterns are very similar in both types of samples, with only differences in the relative intensity of peaks, pointing out to a better grain orientation in hot‐pressed films. Moreover, SEM observation showed a drastic decrease in the hot‐pressed films thickness. Electrical resistivity is decreased in textured materials due to the higher grain orientation and density, confirmed through Hall measurements. On the other hand, Seebeck coefficient is maintained practically unchanged. Power factor at 800°C is much higher in textured materials (0.44 mW/K 2 m) than determined in sintered films (0.30 mW/K 2 m), and in the order of the best typically reported in the literature (0.43 mW/K 2 m).