Verneuil (flame fusion) method
This is a method of growing crystals by passing alumina powder through a flame (acid-hydrogen flame: approx. 2800℃) in which a mixture of oxygen and hydrogen gas is burned, causing the melted alumina to accumulate on the seed crystal. Crystals can be easily grown in a short time. In addition, high purity crystals can be obtained, because no crucible is used.
