Abstract
Liquid phase regions at 1700 °C with nitrogen concentration higher than 40 eq% in the systems LnSiAlON (Ln = Nd, Sm, Gd, Dy, Er and Yb) have been determined. All the systems possess extensive liquid phase regions at 40 eq% N. With increasing nitrogen content, the liquid phase regions contract towards Si-rich compositions. The maximum solubility of nitrogen in the Ln-sialon liquids is slightly above 50 eq%, which is much higher than in Y-sialon liquid, of which the highest nitrogen concentration was determined to be slightly above 30 eq%. With increasing Z-value of rare earth elements, the liquid phase regions contract towards the Si- and Ln-rich side.
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