RU94018432A - Method of alexandrite crystals growing - Google Patents

Abstract

FIELD: methods of big crystals growing. SUBSTANCE: method uses reverse temperature difference in process of alexandrite big crystals growing from melt, that has initial material of beryllium and aluminum oxides with chromophore additions or substandard alexandrite, and flux-solvent. To realize version of crystal growth compositions of high density are used as flux. Charge components are floating on molten bath surface and under action of temperature difference are transferred down on bottom of vessel. To control number of formed nucleus crystal growth is exercised on special platinum base, that has definite number of notches or holes. Under constant state of oversaturation formed by value of temperature gradient crystal nucleus supply with feeding material is exercised uniformly, providing qualitative growth of big crystals. EFFECT: improved process.

Claims (1)

The invention relates to methods for growing large crystals of alexandrite by the method of inverse temperature difference from a melt containing starting material from oxides of beryllium and aluminum with chromophore additives or substandard alexandrite and flux-solvent. To implement the proposed variant of the crystal growth method, high-density compositions are used as a flux. The components of the mixture float on the surface of the melt and, under the influence of temperature difference, are transferred to the bottom of the vessel. To control the number of nuclei formed, crystal growth is carried out on a special platinum substrate having a certain number of notches or holes. With constant supersaturation, created by the magnitude of the temperature gradient, the supply of nascent crystals with nutritious material occurs evenly, ensuring high-quality growth of large crystals.