The importance of paramagnetic impurities to the nuclear magnetic resonance relaxation of ion-conducting glasses

Abstract

Paramagnetic impurities have been shown to affect the 7Li nuclear magnetic resonance relaxation rates in cation-conducting glasses, and wrong data may then be extracted from the experiments. Frequency- and temperature-dependent T 1 −1 studies of lithium borate and thioborate glasses revealed that iron impurities cause frequency-independent relaxation and “shoulders” of the low-temperature slopes in high fields, whereas manganese produces enhanced relaxation peaks. The results of the T 1 −1 (and some T 1 ρ −1 and T 2 −1) measurements are discussed.