Abstract
We present the distribution coefficient for the entire series of rare-earth dopants (RE = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) in flux-grown Y3Al5O12 garnet crystals. When the distribution coefficient is plotted in a logarithmic scale as a function of dopant radius, it shows a smooth parabolic drop from the smallest dopant (Lu3+) at 1.5 to the largest dopant (La3+) at 0.004. This behavior can be interpreted by the lattice strain model, with Lu3+ having close to the ideal radius for the 8-fold coordination site of the aluminum garnet structure.
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