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

doi:10.1063/1.2789786

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

Department of Physics

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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.

Original language	English
Article number	142509
Journal	Applied Physics Letters
Volume	91
Issue number	14
DOIs	https://doi.org/10.1063/1.2789786
Publication status	Published - 2007 Oct 11

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2789786

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title = "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",

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 = "Liu, {Chia Jyi} and Liao, {Chia Yuan} and Wang, {Jung Sheng} and Nayak, {Pradipta K.} and Lin, {Zhi Ru} and Sheu, {Hwo Shuenn}",

year = "2007",

month = oct,

day = "11",

doi = "10.1063/1.2789786",

language = "English",

volume = "91",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

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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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