@article{
author = "Golubović, Aleksandar and Nikolić, Slobodanka and Djurić, Stevan and Valčić, Andreja",
year = "2001",
abstract = "Sapphire (Al2O3) single crystals were grown by the Czochralski technique both in air and argon atmospheres. The conditions for growing sapphire single crystals were calculated by using a combination of Reynolds and Grashof numbers. A critical crystal diameter dc = 20 mm and the critical rate of rotation ωc = 20 rpm were calculated from the hydrodynamics of the melt. The value of the rate of crystal growth was experimentally found to be 3.5 mm/h. According to our previous experiments, it was confirmed that three hours exposures to cone. H3PO4 at 593 K was suitable for chemical polishing. Also, three hours exposure to cone. H3PO4 at 523 K was found to be a suitable etching solution. The lattice parameters a = 0.47573 nm and c = 1.29893 nm were determined by X-ray powder diffraction. The obtained results are discussed and compared with published data.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "The growth of sapphire single crystals",
pages = "418-411",
number = "6",
volume = "66",
doi = "10.2298/jsc0106411g"
}