Co valence by K-edge X-ray absorption spectroscopy, magnetic properties, and structure of polycrystalline bulk Zn/sub 1-x/Co/sub x/O

G. Peleckis, University of Wollongong
X. L. Wang, University of Wollongong
R. S. Liu, National Taiwan University, Taiwan
S. X. Dou, University of Wollongong

Article comments

This article was originally published as: Peleckis, G, Wang, XL, Liu, RS and Dou, Sx, Co valence by K-edge X-ray absorption spectroscopy, magnetic properties, and structure of polycrystalline bulk Zn/sub 1-x/Co/sub x/O, IEEE Transactions on Magnetics, October 2005, 41(10), 2727-2729. Copyright IEEE 2005.

Abstract

We report on magnetic properties and a Co K-edge X-ray absorption spectroscopy (XAS) study of polycrystalline bulk Zn/sub 1-x/Co/sub x/O (x=0.10,0.15,0.17) samples. All samples show paramagnetic behavior and no ferromagnetism was observed. XAS results showed that for all samples the valence of Co is 2+. Spin state assessment derived from Currie-Weiss fitting indicated a possible spin state transition from Co/sup 2+/ high spin to Co/sup 2+/ low spin. Calculated /spl mu//sub eff/ values for samples with x=0.10 and 0.15 indicated an orbital contribution to the effective magnetic moment of the Co ion.