Abstract
Neodymium diffusion was observed in yttrium aluminum garnet (YAG) polycrystals with negligible change of microstructure during diffusion. Ceramic bi-layer samples were fabricated via a technique developed for ceramic laser amplifiers, from flame-spray pyrolized powders of un-doped YAG and 1% Nd:YAG. Diffusion studies were carried out on these samples at temperatures lower than the sintering temperature, such that average grain diameter remained approximately 0.8 μ m for all samples. Effective diffusivity was 117 ± 4 m 2 / s exp 623 ± 70 kJ/mol K RT for temperatures between 1500 and 1600 °C and with 1.2 ± 0.3 grain boundaries per micrometer.
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