Abstract
Abstract Quantitative analytical electron microscopy study of dopant distribution in the microstructure of selected Nd-α-sialon samples revealed the presence of relatively large amounts of glassy phase at quadruple pockets, which exhibited a common composition similar to a melilite solution. Al segregants were depleted from adjacent grain boundaries to satisfy the “stoichiometry” of such glass. Existence of this glass results in significant deviation of the Nd-α-sialon composition from the expected values, which shifts the α-β-sialon phase boundary. Only extra Nd 2 O 3 additives enable a monolithic α-sialon microstructure. The absence of similar glass in Yb-α-sialon materials keeps the phase relations from such deviations.
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