Abstract
The dependence of Si-O distances on the electronegativity of the modified ion has beenexamined for X2YSi2O7 melilites. The Si-O distance depends, in part, on the electronegativity of the Y ion and the two groups of variation trend are observed. One is Mg2+-Mn2+ series and the other is Al3+-Be2+-Zn2+-Co2+ series. In the former the Y sites are occupied by the lower electron density ions, whereas in the latter the Y sites are occupied by the higher electron density ions.
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