TITLE

Simultaneously enhanced thermoelectric power and reduced resistivity of Na[sub x]Co[sub 2]O[sub 4] by controlling Na nonstoichiometry

AUTHOR(S)
Motohashi, T.; Naujalis, E.; Ueda, R.; Isawa, K.; Karppinen, M.; Yamauchi, H.
PUB. DATE
September 2001
SOURCE
Applied Physics Letters;9/3/2001, Vol. 79 Issue 10
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Electrical resistivity (ρ) and thermoelectric power (S) were measured for Na[sub x]Co[sub 2]O[sub 4] samples with various Na contents (x). A highly precise control of Na nonstoichiometry was facilitated by optimizing the synthesis procedure. With increasing x, the absolute value of ρ monotonically decreased, while the value of S increased. For the x=1.5 sample, S reached a value as high as ∼120 μV/K (at 300 K). © 2001 American Institute of Physics.
ACCESSION #
5072618

 

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