most citedSynthesis and properties of CoO2, the x = 0 end member of the LixCoO2 and NaxCoO2 systems

73 citations · 73 across the 1 of their papers we have counts for

collaborators

2 papers

cond-mat.supr-con2004

Oxidation State of Cobalt in the NaxCoO2-d yH2O Superconductor

Maarit Karppinen, Isao Asako, Teruki Motohashi +1

Here we present results of accurate wet-chemical redox analyses, revealing that the oxidation number of cobalt in the newly discovered CoO2-layer superconductor, NaxCoO2 yH2O (x ~…

cond-mat.str-el2003

The valence state of iron in the Sr2Fe(Mo,W,Ta)O6.0 double-perovskite system: An Fe K-edge and L2,3-edge XANES study

M. Karppinen, H. Yamauchi, Y. Yasukawa +4

Here we employ both Fe K and L2,3 edge x-ray absorption near-edge structure (XANES) spectroscopy techniques to clarify that iron in the B-site ordered double-perovskite halfmetal,…