Fabrication of transition metal doped sapphire single crystal by high temperature and pressure acceleration method

Metallic chromium was diffused in the{0001},{1120} white sapphires which were grown by the Verneuil method to enhance the physical properties of the sapphires. Chromium metal vapour pressure and {{{{ { N}_{2 } }}}} pressure were kept by {{{{ { 1$\times$10}^{-4 } }}}} torr at 21 50 $^{\circ}C$ and 6 atm in the quartz-tube, respectively. The color do the Cr-doped sapphires was changed to light red. Chromium was diffused faster in the {1120} than 수 the {0001} plane. It was speculated that the planar density was one the factors determining diffusion coeffcient