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

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)1p and T(-1)2) measurements are discussed.