| 摘要 |
An improved synthetic gem-like crystal simulating alexandrite and method of making the same, wherein, in one embodiment, the crystal is grown on a chrysoberyl seed placed in a flux melt environment with the flux melt including a flux material, a nutrient material and suitable dopants to provide color changes to the crystal which simulates alexandrite in daylight and tungsten light. A typical flux material is lithium polymolybdate, the nutrient material is typically aluminum oxide and beryllium oxide, and the dopants include iron and chromium. In another embodiment, the crystal is grown by using the Czochralski method, wherein a nutrient and suitable dopants including iron and chromium are heated to form a melt. A seed is pulled from the melt at a predetermined rate, during which time growth occurs on the seed. The crystal can also be formed by using the Bridgman, Verneuil and floating zone methods. The iron and chromium in the dopants are in predetermined concentrations to achieve the aforesaid color changes in the crystals formed by the methods.
|
