The spin-lattice relaxation times, T1, in α-, β-, and amorphous Si3N4 have been obtained for the first time, using a multiple-pulse saturation recovery method. The saturation recovery of the 29Si magnetization follows exponential behavior under magic-angle spinning conditions, within the limits of experimental error. A rather wide dispersion of T1 values is observed for the phases of Si3N4: 284±29 min (-46.686 ppm) and 260±23 min (-48.812 ppm) for the α-phase, 36±4 min for the β-phase, and 11±1 min for the amorphous phase, assuming an exponential recovery. The values obtained for the exponent in the power-law fitting are 0.599(9) (-46.686 ppm) and 0.61(1) (-48.812 ppm) for the α-phase, 0.52(2) for the β-phase, and 0.53(3) for the amorphous phase.
|ジャーナル||Journal of the American Ceramic Society|
|出版ステータス||Published - 2000 9 1|
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