Feedstock for single crystal growth

As a producer of cubic zirconia and leuco sapphire, RHT uses high-purity zirconium, aluminum and other rare-earth metal oxides as dopants. We sell some of these oxides.
The primary stock for leuco sapphire growth is aluminum oxide (of purity no less than 99.99%) that may come as a small-crystal corundum or aluminum oxide powder. Powder can be granulated or have particles of different shape and size. When melting, the aluminum oxide batch shrinks significantly, so to efficiently grow a crucible volume, smaller leuco sapphire single crystals made with the Verneuil process or compacted aluminum oxide powder ingots are to be used.