Synthetic moissanite gemstone imitating tourmaline and preparation method thereof
A technology for synthesizing moissanite and moissanite, which is applied in chemical instruments and methods, single crystal growth, polycrystalline material growth, etc., can solve the problem that synthetic moissanite has not been used to make imitation tourmaline ornaments, etc.
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Embodiment 1
[0048] Embodiment 1, a kind of synthetic moissanite single crystal imitating green tourmaline, preparation method is as follows:
[0049] The 4H-SiC seed crystal is placed at the bottom of the upper cover of the crucible, and the high-purity SiC powder is placed at the bottom of the crucible. The pressure of the growth chamber is 50-100mbar, and the temperature is raised to 2200-2300°C, and the SiC powder at the bottom is decomposed into Si and SiC 2 and Si 2 The three main gas phase components, C, are transported to the surface of the seed crystal at a lower temperature, and through deposition, the crystal grows continuously. During the growth process, by passing an appropriate amount of N 2 , so that the concentration of N doped in 4H-SiC reaches 1×10 19 / cm 3 , to obtain grass-green moissanite single crystal.
[0050] When the above-mentioned single crystal is cut and ground into rectangular gemstones or emerald-shaped faceted gemstones with the growth surface as the t...
Embodiment 2
[0051] Embodiment 2, a kind of synthetic moissanite single crystal imitating polychromatic tourmaline, preparation method is as follows:
[0052] The 4H-SiC and 15R-SiC symbiotic seed crystals (green and yellow coexistence) were placed at the bottom of the upper cover of the crucible, and the high-purity SiC powder was placed at the bottom of the crucible. The pressure of the growth chamber is 50-120mbar, and the temperature is raised to 2000-2500°C, and the SiC powder at the bottom is decomposed into Si and SiC 2 and Si 2 The three main gas phase components, C, are transported to the surface of the seed crystal at a lower temperature, and through deposition, the crystal grows continuously. During the growth process, by passing an appropriate amount of N 2 , so that the concentration of N doped in the crystal reaches 2×10 19 / cm 3 , to obtain grass-green-yellow moissanite crystals. The emerald cut is preferred to cut and grind the above-mentioned single crystal to obtain ...
Embodiment 3
[0054] Embodiment 3, a kind of synthetic moissanite crystal imitating polychromatic tourmaline, preparation method is as follows:
[0055] The 6H-SiC seed crystal is placed at the bottom of the upper cover of the crucible, and the high-purity SiC powder is placed at the bottom of the crucible. The pressure of the growth chamber is 50-120mbar, and the temperature is raised to 2000-2500°C, and the SiC powder at the bottom is decomposed into Si and SiC 2 and Si 2 The three main gas phase components, C, are transported to the surface of the seed crystal at a lower temperature, and through deposition, the crystal grows continuously. In the early growth process, by passing an appropriate amount of N 2 , so that the concentration of N doped in 6H-SiC reaches 2×10 19 / cm 3 , a dark green moissanite single crystal was obtained; N was stopped in the later stage, and the concentration of residual N impurities was about 2×10 17 , the color of moissanite grown in the later stage is li...
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