English  |  正體中文  |  简体中文  |  Items with full text/Total items : 6507/11669
Visitors : 29446415      Online Users : 234
RC Version 3.2 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/14234

Title: 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
Authors: Liu, Chia-Jyi;Liao, Chia-Yuan;Wang, Jung-Sheng;Nayak, Pradipta K.;Lin, Zhi-Ru;Sheu, Hwo-Shuenn
Contributors: 物理學系
Date: 2007-10
Issue Date: 2012-09-10T06:15:18Z
Publisher: American Institute of Physics
Abstract: 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.
Relation: Appl. Phys. Lett., 91(14): 142509
Appears in Collections:[物理學系] 期刊論文

Files in This Item:

File SizeFormat

All items in NCUEIR are protected by copyright, with all rights reserved.


DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback