caa a22 4500 388020105 CHVBK 20180307124921.0 cr unu---uuuuu 161130e199804 xx s 000 0 eng 10.1557/JMR.1998.0118 doi S0884291400043557 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0118 Pure tetravalent nickel in γ-type nickel oxyhydroxide as secondary battery electrode [Elektronische Daten] Pure tetravalent nickel in γ-type cobalt substituted nickel oxyhydroxide, Ni0.70Co0.30O2K0.30(H2O)0.42, could be obtained by the "chimie douce” reaction. The presence of tetravalent nickel is confirmed by comparing the Ni K-edge XANES spectrum of the sample with those of reference compounds having various nickel valency and similar layer structure. The Co K-edge XANES spectrum indicates that the trivalent cobalt remains unchanged regardless of the nickel valency. The structural modification during chimie douce reaction observed from XRD patterns and the result of iodometric titration are consistent with the Ni and Co K-edge XANES data. Copyright © Materials Research Society 1998 Han Kyoo-Seung Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226, Japan Yoshimura Masahiro Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226, Japan Yoon Joo-Byoung Department of Chemistry, Center for Molecular Catalysis, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea Choy Jin-Ho Department of Chemistry, Center for Molecular Catalysis, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea Park Kwang-Ja Inorganic Chemistry Division, National Institute of Technology and Quality, 2, Joongang-dong, Kwacheon 427-010, Korea Journal of Materials Research Cambridge University Press 13/4(1998-04), 880-882 0884-2914 13:4<880 1998 13 JMR https://doi.org/10.1557/JMR.1998.0118 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0118 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Han Kyoo-Seung Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226, Japan NATIONALLICENCE 700 1- Yoshimura Masahiro Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226, Japan NATIONALLICENCE 700 1- Yoon Joo-Byoung Department of Chemistry, Center for Molecular Catalysis, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea NATIONALLICENCE 700 1- Choy Jin-Ho Department of Chemistry, Center for Molecular Catalysis, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea NATIONALLICENCE 700 1- Park Kwang-Ja Inorganic Chemistry Division, National Institute of Technology and Quality, 2, Joongang-dong, Kwacheon 427-010, Korea NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/4(1998-04), 880-882 0884-2914 13:4<880 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge