M Wachtler,
A Speghini, K Gatterer… - Journal of the …, 1998 - Wiley Online Library
Glasses of composition (x‐1) PbO (100‐x) GeO21Ln2O3, with x= 30 mol%(Ln= Nd, Eu, Er),
40 mol%(Ln= Pr, Nd, Sm, Eu, Dy, Ho, Er, Tm), and 50 mol%(Ln= Eu, Er), have been …