Abstract

Epitaxial Naβ″-Al 2O 3 single crystal films have been grown into sapphire (0001)-substrates. The kinetic measurements and calculation indicate that the β″-Al 2O 3 crystal is formed via chemical reactions between the gaseous alkali-species and sapphire substrate which are controlled by diffusion of oxygen species in the solid phase. The mechanism and crystallographic translations of film-growth are discussed.

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