Chemistry Letters, Vol.32, No.6, 500-501, 2003
Spontaneously induced reduction of trivalent ytterbium in synthesized crystal of calcite
XANES spectra showed the occurrence of divalent ytterbium in the synthetic calcite (CaCO3). Approximately 15% ytterbium ion existed as divalent in calcite, although ytterbium ion was trivalent in the starting solutions.