Preparation method of beryllium aluminate crystal substrate color changing gem

Abstract

The invention discloses a beryllium aluminate crystal substrate phenomenal gem, a preparation method and a growth device thereof, which is characterized in that, in a special growth device, BeAl2O4 monocrystal substrate is proportionally blended with Cr<3+>, Fe<3+>, Ti<3+> or Ni<2+> three transition element ions, and a vertical static temperature gradient method is used for preparing the artificial phenomenal gem with strong color change effect. The invention aims at meeting the constant requirements of people on the color and hue of the gems of chrysopal group, wishing that more distinct variation can be obtained in the aspect of color change effect between red and green, and solving the civil batch production problem of the gem. The phenomenal gem which can generate broader color and hue has obvious color change effect between red and green. The preparation method has the advantages of obviously enhancing mass output rate, having relatively simple equipment, and overcoming the defective impact of mechanical drive and vibration on crystal growth, thus being beneficial to the scale production of high-quality gems.

Description

technical field [0001] The invention relates to special glass, in particular to a thulium-germanate-doped laser glass and a preparation method thereof. Background technique [0002] There are many kinds of natural gemstones in nature, including ruby, sapphire, pure beryl, jade... etc. These gemstones have bright colors and hard textures, and are popular gemstones. Especially the crystals of the chrysoberyl family: Chrysoberyl Cat's Eye, Chrysoberyl and Alexandrite are rare special gems with high prices. They are deeply loved by people and have a large civilian market, but these gemstones have few natural resources and cannot meet people's growing needs. Therefore, the technology of artificially synthesizing the above-mentioned gemstones has appeared. The techniques used mainly include: melt method, hydrothermal method, flame method and flux method, etc., but the crystal blanks obtained by these methods are too small and have no practical decorative value. In 1980, the Unit...

AI Technical Summary

Problems solved by technology

[0005] In recent years, some relatively new technologies for artificially synthesizing the above three kinds of gemstones have been recorded in patent documents, for example, Chinese patent announcement number CN1033313C, the date of authorization announcement was November 20, 1996, and the invention title was "manufacturing method of artificial cat's eye" , the method adopts concentric crucible method, toning process, etc. to prepare cat's-eye gemstones of various colors; Chinese patent announcement number CN1062318C, authorized announcement date on February 21, 2001, invention name "growth method of chrysoberyl group decorative gemstones" and its device", the growth method used in this invention is the rotary temperature gradient method, and the growth device is a rotary temperature gradient furnace, which can prepare chrysoberyl opal, chrysoberyl, and alexandrite alexandrite respectively. It is characterized in that the process of crystal growth is from The bottom of the melt is upward, the crucible can be rotated or moved up and down, and the required impurities can be added from the top of the crucible. The disadvantage is that only gemstones with specific colors can be produced, and the obtained gemstones cannot produce broad hues. The effect of red and green discoloration is not ideal. At the same time, due to the adverse effects of mechanical transmission and vibration on crystal growth, such as a large number of color bands and growth stripes in the crystal, it seriously affects the quality of the crystal.

[0006] The above-mentioned gem synthesis technology can only produce gemstones with specific colors, and the obtained gemstones have a single tone, and the effect of red and green discoloration is not ideal

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