Abstract
Single crystals of β″- Al 2 O 3 were grown by the top seeded solution method from a Li 2 O- V 2 O 5 flux. Similar methods were also applicable to liquid phase epitaxial growth of β″- Al 2 O 3 films on selected substrates. Seed crystals and substrates included β″- Al 2 O 3, β- Al 2 O 3, MgAl 2 O 4 and LaMgAl 11 O 19. Phase diagram studies provided an optimum range of compositions and temperatures for growth in platinum containers. A composition of 23 wt% Na 2 O,54 wt% Al 2 O 3, and 23 wt% LiVO 3 enabled growth to occur at temperatures of 1450–1550°C. Single crystal platelets of cm size were grown with fair quality but still contained small flux inclusions which led to delamination. Epitaxial films of up to 100 μm thickness were successfully grown on [111] oriented MgAl 2O 4.
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