Abstract
In this work, the results of the spectral studies of xNa2O · (100 – x)B2O3 · Er2O3 (x = 0–45) melts at 1273 K are presented. When increasing the Na2O concentration in melts the cyclic changes of the coordination numbers of boron atoms are observed. It is shown that the coordination numbers of the Er(III) ions increase from 6 to 8 in the range from 0 to 12 mol % Na2O.
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