S. Hayakawa et al., Analysis of trace Co in synthetic diamonds using synchrotron radiation excited X-ray fluorescence analysis, J CRYST GR, 210(1-3), 2000, pp. 388-394
Synchrotron radiation excited X-ray fluorescence analysis was utilized for
characterization of trace impurities in synthetic diamonds. Advantage of th
e energy tunability was fully utilized to evaluate the attenuation of X-ray
s through the sample, and the absorption corrected X-ray fluorescence yield
was utilized for quantitative analysis. Diamonds grown with several types
of metallic solvents were investigated, and quantitative analysis of trace
Co was carried out. It was found that Co prefers to be dissolved into (1 1
1) growth sector and that Co concentration in the (1 I 1) growth sector dec
reases one order of magnitude with the existence of Ni in the solvent. XANE
S spectra of dissolved Co shows characteristic pre-edge feature similar to
that reported with the dissolved Ni. Experimental results suggest that both
Ni and Co occupy in the similar site in the diamond lattice and that Ni is
easier to be dissolved into diamonds. (C) 2000 Elsevier Science B.V. All r
ights reserved.