Abstract
Network former mixing effects in Yb3+-doped glasses in the system [(2TeO2)x(P2O5)1–x]0.6[(PbO)0.5-(ZnO)0.5]0.4 have been investigated using a comprehensive strategy involving complementary NMR (31P,125Te, 207Pb) and EPR (of Yb3+ probe ions) spectroscopies. Phosphate local environments and connectivities are extracted from detailed 31P MAS NMR line shape analyses with assignments to distinct PnmTe sites supported by recoupling of homonuclear spin–spin interactions (refocused-INADEQUATE experiments). These results suggest a preference for P–O–Te over P–O–P and Te–O–Te connectivities for x 0.6, where the anionic fraction of phosphate exceeds the expected fraction (67%) based on composition. On a local scale, nonlinear trends...
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