Abstract
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.
Original language | English |
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Pages (from-to) | 2251-2254 |
Number of pages | 4 |
Journal | Journal of the American Ceramic Society |
Volume | 83 |
Issue number | 9 |
Publication status | Published - 2000 Sep 1 |
Externally published | Yes |
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry