Abstract
A number of rare earth sesquioxides prepared by rapid cooling of the melt consist entirely of the metastable monoclinic (B) form or a mixture of B and the cubic (C) form which is stable at room temperature. This may be explained by suppression of the B to C transformation for Sm2O3, Eu2O3, Tb2O3 but the B-form is metastable at all temperatures for Y2O3, Er2O3 and Yb2O3 and its appearance in these oxides is thus related to the nucleation kinetics of B and C from the melt.
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McPherson, R. Formation of metastable monoclinic rare earth sesquioxides from the melt. J Mater Sci 18, 1341–1345 (1983). https://doi.org/10.1007/BF01111952
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DOI: https://doi.org/10.1007/BF01111952