1993 Volume 101 Issue 1177 Pages 1065-1067
The local structure around Eu3+ ions in sodium aluminosilicate glasses was investigated on the basis of phonon sideband associated with the 5D0←7F0 transition of Eu3+. It was found that the positive charge of Eu3+ was compensated by nonbridging oxygens (NBOs) in Q3 units rather than by the excess negative charge of AlOn/2(n-3)- units. With the aid of a previous work of Mössbauer results, the coordination change around Eu3+ ions induced by an incorporation of Al has been discussed. It was assumed that NBO-Na+ pairs are replaced by bridging oxygens shared with Si and Al.