Abstract
The high resolution spectral data on Nd3+ and Yb3+ in rare earth (RE) oxoborates RCa4O(BO3)3—with R3+ = Gd3+ and Y3+ are analyzed in terms of the disordered structure of these crystals proposed recently. A mixed occupancy of R3+ and Ca2+(1) sites creates the disorder that increases with decreasing the rare earth ionic radii. This mixed occupancy is valid for dopants too and creates “charge defects” in crystals. The disorder is spectrally manifested by minor sites and prevailing centers lineshapes and broadenings. Spectral characteristics of a minor site, observed in Nd3+ and Yb3+ spectra of both crystals, are qualitatively in accord with the proposed structure. The effects of mixed occupancy of the cationic sites in RCOB on rare earth dopants in R3+ sites is also analyzed. The possible activator centers probabilities, function on RCOB structure, that lead to lineshapes and widths are estimated.
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