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題名: Thermopower and Co K-edge Studies of Potassium Sodium Cobalt Oxyhydrates Na0.33K0.02(H2O)1.33CoO2-δ and Na0.07K0.21(H2O)0.63CoO2-δ
作者: Liu, Chia-Jyi;Liao, Chia-Yuan;Wang, Jung-Sheng;Nayak, Pradipta K.;Lin, Zhi-Ru;Sheu, Hwo-Shuenn
貢獻者: 物理學系
日期: 2007-10
上傳時間: 2012-09-10T06:15:18Z
出版者: American Institute of Physics
摘要: We report measurements of the thermopower and Co K-edge x-ray absorption spectroscopy on bilayer and monolayer (Na,K)x(H2O)yCoO2−δ. According to the Co K-edge x-ray absorption spectra, the Co oxidation number for bilayer hydrate Na0.33K0.02(H2O)1.33CoO2−δ is higher than that of monolayer hydrate Na0.07K0.21(H2O)0.63CoO2−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(H2O)yCoO2−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-Na0.7CoO2 is transformed to potassium sodium cobalt oxyhydrates.
關聯: Appl. Phys. Lett., 91(14): 142509
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