Abstract
A qualitative model is proposed to explain the differences between the optical properties of the six-coordinated Cr 4+ ion in the pyrochlores, Y 2Sn 2O 7 and Y 2Ti 2O 7. It is shown that polarization of the electron density of the oxygen ions occupying the 48f sites of the pyrochlore lattice is responsible for the observed differences in the optical properties.
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