Article ID Journal Published Year Pages File Type
1516685 Journal of Physics and Chemistry of Solids 2011 4 Pages PDF
Abstract
The variations with temperature of the relaxation mechanisms of the 9Be, 27Al, and 29Si nuclei in emerald (Be3Al2Si6O18:Cr3+) single crystals were investigated by using a pulse NMR spectrometer. The values of the spin-lattice relaxation rates T1−1 for the three nuclei are different, and these differences are attributed to the differences between their Larmor frequencies and their local nuclear environments. The relaxation rates of the 9Be and 27Al nuclei undergo no abrupt changes within the temperature range 180-400 K, which indicates that there are no phase transitions within this temperature range. The spin-lattice relaxation rates of 9Be and 27Al were found to be proportional to temperature. Therefore, the nuclear spin-lattice relaxation processes of these two nuclei proceed via single-phonon processes.
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Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
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