Abstract
Eu 3+ ion was adopted as a probe to detect the probability of entrance of alkali elements into the crystal lattice of MgO, CaO and La 2O 3 by means of its characteristic emission. Based on the experimental data it is concluded that Li + and Na + ions can substitute Mg 2+ and Ca 2+ ions and only a small amount of K + ion can enter into the lattice of CaO. Whilst Li + ion can not enter into the lattice of lanthana. The conclusion of this investigation is in good agreement with that obtained by Lunsford by ESR studies.
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