Growth of corundum single crystals by seed rotation method
1981; Elsevier BV; Volume: 54; Issue: 3 Linguagem: Inglês
10.1016/0022-0248(81)90488-7
ISSN1873-5002
AutoresKoichi Watanabe, Akio Iida, Yoshihiro Sumiyoshi,
Tópico(s)Minerals Flotation and Separation Techniques
ResumoSingle crystals of corundum attaining 5 cm across were synthesized from cryolite (Na3AlF6) flux, by the seed rotation method. The effect of growth conditions such as growth temperature, temperature difference, baffle aperture, and rotation rate, upon crystal perfection is discussed so as to clarify the optimum condition required to obtain crystals of high quality, containing the minimum amount of flux inclusions. The external shape of the corundum crystals did not show a noticeable change except that the edges became more rounded with the increase of the rotation rate. Experiments to stimulate convective flow in solution were carried out on two systems of water and water-saccharose under the conditions simulating growth conditions in flux growth. When a baffle plate of 20% aperture was used, the flow velocity was a maximum.
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