Thermopower and Co K -edge studies of potassium sodium cobalt oxyhydrates Na0.33 K0.02 (H2 O)1.33 Co O2-δ and Na0.07 K0.21 (H2 O)0.63 Co O2-δ

Chia-Jyi Liu, Chia Yuan Liao, Jung Sheng Wang, Pradipta K. Nayak, Zhi Ru Lin, Hwo Shuenn Sheu

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We report measurements of the thermopower and Co K -edge x-ray absorption spectroscopy on bilayer and monolayer (Na,K)x (H2 O)y Co O2-δ. According to the Co K -edge x-ray absorption spectra, the Co oxidation number for bilayer hydrate Na0.33 K0.02 (H2 O)1.33 Co O2-δ is higher than that of monolayer hydrate Na0.07 K0.21 (H2 O)0.63 Co O2-δ with a chemical shift of 3.5 eV, which is in sharp contrast with Co K -edge x-ray absorption spectroscopy and cerimetric titration results for Nax (H2 O)y Co O2-δ, where there is essentially no difference of the oxidation number of Co between bilayer and monolayer sodium cobalt oxyhydrates. According to thermopower analysis, band narrowing is observed when γ- Na0.7 Co O2 is transformed to potassium sodium cobalt oxyhydrates.

Original languageEnglish
Article number142509
JournalApplied Physics Letters
Volume91
Issue number14
DOIs
Publication statusPublished - 2007 Oct 11

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x ray absorption
potassium
cobalt
sodium
hydrates
x ray spectroscopy
absorption spectroscopy
oxidation
x ray spectra
titration
chemical equilibrium
absorption spectra

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Liu, Chia-Jyi ; Liao, Chia Yuan ; Wang, Jung Sheng ; Nayak, Pradipta K. ; Lin, Zhi Ru ; Sheu, Hwo Shuenn. / Thermopower and Co K -edge studies of potassium sodium cobalt oxyhydrates Na0.33 K0.02 (H2 O)1.33 Co O2-δ and Na0.07 K0.21 (H2 O)0.63 Co O2-δ. In: Applied Physics Letters. 2007 ; Vol. 91, No. 14.
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abstract = "We report measurements of the thermopower and Co K -edge x-ray absorption spectroscopy on bilayer and monolayer (Na,K)x (H2 O)y Co O2-δ. According to the Co K -edge x-ray absorption spectra, the Co oxidation number for bilayer hydrate Na0.33 K0.02 (H2 O)1.33 Co O2-δ is higher than that of monolayer hydrate Na0.07 K0.21 (H2 O)0.63 Co O2-δ with a chemical shift of 3.5 eV, which is in sharp contrast with Co K -edge x-ray absorption spectroscopy and cerimetric titration results for Nax (H2 O)y Co O2-δ, where there is essentially no difference of the oxidation number of Co between bilayer and monolayer sodium cobalt oxyhydrates. According to thermopower analysis, band narrowing is observed when γ- Na0.7 Co O2 is transformed to potassium sodium cobalt oxyhydrates.",
author = "Chia-Jyi Liu and Liao, {Chia Yuan} and Wang, {Jung Sheng} and Nayak, {Pradipta K.} and Lin, {Zhi Ru} and Sheu, {Hwo Shuenn}",
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Thermopower and Co K -edge studies of potassium sodium cobalt oxyhydrates Na0.33 K0.02 (H2 O)1.33 Co O2-δ and Na0.07 K0.21 (H2 O)0.63 Co O2-δ. / Liu, Chia-Jyi; Liao, Chia Yuan; Wang, Jung Sheng; Nayak, Pradipta K.; Lin, Zhi Ru; Sheu, Hwo Shuenn.

In: Applied Physics Letters, Vol. 91, No. 14, 142509, 11.10.2007.

Research output: Contribution to journalArticle

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T1 - Thermopower and Co K -edge studies of potassium sodium cobalt oxyhydrates Na0.33 K0.02 (H2 O)1.33 Co O2-δ and Na0.07 K0.21 (H2 O)0.63 Co O2-δ

AU - Liu, Chia-Jyi

AU - Liao, Chia Yuan

AU - Wang, Jung Sheng

AU - Nayak, Pradipta K.

AU - Lin, Zhi Ru

AU - Sheu, Hwo Shuenn

PY - 2007/10/11

Y1 - 2007/10/11

N2 - We report measurements of the thermopower and Co K -edge x-ray absorption spectroscopy on bilayer and monolayer (Na,K)x (H2 O)y Co O2-δ. According to the Co K -edge x-ray absorption spectra, the Co oxidation number for bilayer hydrate Na0.33 K0.02 (H2 O)1.33 Co O2-δ is higher than that of monolayer hydrate Na0.07 K0.21 (H2 O)0.63 Co O2-δ with a chemical shift of 3.5 eV, which is in sharp contrast with Co K -edge x-ray absorption spectroscopy and cerimetric titration results for Nax (H2 O)y Co O2-δ, where there is essentially no difference of the oxidation number of Co between bilayer and monolayer sodium cobalt oxyhydrates. According to thermopower analysis, band narrowing is observed when γ- Na0.7 Co O2 is transformed to potassium sodium cobalt oxyhydrates.

AB - We report measurements of the thermopower and Co K -edge x-ray absorption spectroscopy on bilayer and monolayer (Na,K)x (H2 O)y Co O2-δ. According to the Co K -edge x-ray absorption spectra, the Co oxidation number for bilayer hydrate Na0.33 K0.02 (H2 O)1.33 Co O2-δ is higher than that of monolayer hydrate Na0.07 K0.21 (H2 O)0.63 Co O2-δ with a chemical shift of 3.5 eV, which is in sharp contrast with Co K -edge x-ray absorption spectroscopy and cerimetric titration results for Nax (H2 O)y Co O2-δ, where there is essentially no difference of the oxidation number of Co between bilayer and monolayer sodium cobalt oxyhydrates. According to thermopower analysis, band narrowing is observed when γ- Na0.7 Co O2 is transformed to potassium sodium cobalt oxyhydrates.

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