Abstract
The spin-lattice relaxation times T 1 of 1H and 29Si spins in talc have been measured at room temperature with and without magic-angle spinning (MAS) of the sample. Paramagnetic impurities work as relaxation centers. 1H T 1 depends on the spinning rate, whereas 29Si T 1 is independent of the spinning rate. These facts demonstrate that spin diffusion plays an important role in 1H relaxation but not in 29Si relaxation. 29Si spins relax through dipole-dipole interactions with electron spins directly, which mechanism is not affected by spinning. The relaxation rates have been analyzed theoretically.
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