Scholz K, Thomas B
Department of Chemistry, University of Mining and Technology, Freiberg, Germany.
Solid State Nucl Magn Reson. 1995 Jul;4(5):309-11. doi: 10.1016/0926-2040(95)00011-e.
Silicate glasses without paramagnetic components show 29Si relaxation times, T1, in the order of minutes. Because of these T1 values, unacceptably long instrument times are needed to obtain satisfactory' signal-to-noise ratios. Therefore, all samples were doped with MnO when microstructures of electrode glasses were investigated. Small amounts of paramagnetic ions in the glass reduce the relaxation time but do not affect the electrode properties. In any case when the distribution of manganese ions is homogeneous, the relaxation rates are proportional to the MnO content. The spin-lattice relaxation times of the different Qn species are similar within error limits. The best spectra were obtained using 0.1 mol% MnO.
不含顺磁性成分的硅酸盐玻璃的29Si弛豫时间T1在几分钟的量级。由于这些T1值，需要长得无法接受的仪器时间才能获得令人满意的信噪比。因此，在研究电极玻璃的微观结构时，所有样品都掺杂了MnO。玻璃中少量的顺磁性离子会缩短弛豫时间，但不会影响电极性能。在任何情况下，当锰离子分布均匀时，弛豫速率与MnO含量成正比。不同Qn物种的自旋晶格弛豫时间在误差范围内相似。使用0.1 mol%的MnO可获得最佳光谱。
