Abstract
Diffusion of scandium, gallium and ytterbium ions into single- and poly-crystalline yttrium aluminum garnets has been studied. Volume diffusion coefficients of gallium ions in single crystals were larger than those of scandium and gallium ions. On the other hand, the diffusion coefficients of scandium and ytterbium ions took almost the same values. The cations diffusion exhibited an extrinsic behavior. Cation ratio of Y/Al influenced the diffusivity of scandium and ytterbium diffusion. The yttrium-rich YAG had a smaller concentration of yttrium vacancies than that with a stoichiometric composition. The scandium and ytterbium ions preferentially diffused along grain boundaries.
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