Sc3+–Lu3+‐Doped α‐SiAlONs

Sc 3+ and dual Sc 3+ -Lu 3+ -doped α-SiAlON compositions were sintered by hot pressing, and the formation behavior, microstructure, and mechanical properties were assessed. It was found that the small cation Sc could not be accommodated into the α-SiAlON structure alone. The addition of Lu 2 O 3 in the composition induces the Sc 3 + cation to enter the α-SiAlON structure, and leads to the production of α-SiAlON with an elongated-grain microstructure. Transmission electron microscopy analysis shows that α-SiAlON grains always contain an α-S1 3 N 4 core, implicating heterogeneous nucleation to be in present in a mixed lutetium/scandium-doped α-SiAlON system.

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