Abstract
The spin-lattice relaxation times of Fe3+ in LiAl5O8 have been obtained at temperatures as high as 750K, using Mossbauer spectroscopy, for the first time. The Raman relaxation process is found to have an insignificant contribution from the acoustic modes of lattice vibrations. On the other hand, the internal mode of FeO4 tetrahedra at 192 cm-1 is found to contribute dominantly to the Raman relaxation of the Fe3+ ions. The contribution from the direct mode of spin-lattice relaxation due to the acoustic phonons is found to be relatively significant even at higher temperatures.
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