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An aluminoborosilicate glass, containing high amount of rare earth (RE)accordingly to the following composition 50.68 SiO2 - 4.25 Al2O3 - 8.50 B2O3 -12.19 Na2O - 4.84 CaO - 3.19 ZrO2 - 16.35 RE2O3 (wt.%), is currently understudy for the immobilization of nuclear waste solutions. In this work, wewanted to investigate the effect of changing the RE cation type on the glassstructure and on its crystallization behavior. For this purpose, a glass serieswas elaborated in which the nature of the RE is varying from lanthanum tolutetium. In this glass series, only little effect was observed on the glassstructure. On the contrary, a strong impact was put in evidence on thecrystallization behavior through different heat treatments. A slow cooling ofthe melt at 1^/circC/min, revealed significant crystallization of apatiteCa2RE8(SiO4)6O2 in sample containing rare earths with ionic radii close to thatof calcium. Another heat treatment consisting of successive nucleation andgrowth stages, performed to force the crystallization in the bulk and reduceany surface crystallization effect, put in evidence the existence of a stronglyheterogeneous second rare earth rich silicate phase for samples containing REwith low ionic radius (from Y to Lu).

Effect of changing the rare earth cation type on the structure and crystallization behavior of an aluminoborosilicate glass