2024-03-28T15:02:17Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00005417
2023-01-16T03:50:00Z
320:321:322
High electrical conductivity of layered cobalt oxide Ca_3Co_4O_9 epitaxial films grown by topotactic ion-exchange method
Sugiura, Kenji
Ohta, Hiromichi
Nomura, Kenji
Hirano, Masahiro
Hosono, Hideo
Koumoto, Kunihito
open access
Copyright (2006) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Epitaxial film of a layered cobalt oxide, Ca_3Co_4O_9, was fabricated on a (0001) face of an α-Al_2O_3 substrate by a topotactic ion-exchange method using a γ-Na_0.8CoO_2 epitaxial film as a precursor. High-resolution x-ray diffraction and atomic force microscope measurements revealed that the film was high-quality (001)-oriented Ca_3Co_4O_9 with stepped and terraced surface morphology. The film exhibits a high electrical conductivity of 2.95*10^2 S cm^-1 and a large Seebeck coefficient of ~ +125 μVK^-1, which leads to the thermoelectric power factor (TPF) of 4.5*10^-4 Wm^-1 K^-2 at 300 K, potentially usable as a building block of the multilayered film structure with an enhanced TPF value.
American Institute of Physics
2006-01-17
eng
journal article
VoR
http://hdl.handle.net/2237/7021
https://nagoya.repo.nii.ac.jp/records/5417
https://doi.org/10.1063/1.2234277
0003-6951
Applied Physics Letters
89
3
032111
032111
https://nagoya.repo.nii.ac.jp/record/5417/files/ApplPhysLett_89_032111.pdf
application/pdf
260.1 kB
2018-02-19