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Colored moissanite gemstone and preparation method thereof

A color moissanite and moissanite technology, applied in the field of artificial synthetic gemstones, can solve the problems of limited output, slow growth rate, limited color types, etc., and achieve the effect of uniform color and good transparency

Active Publication Date: 2013-09-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only 6H-SiC and 4H-SiC can obtain stable yield and excellent quality in the laboratory and production; 24R-SiC is not the mainstream crystal form, while 3C-SiC is generally synthesized by CVD method, with slow growth rate and low yield. limited
It can be seen that due to the limitation of the production of moissanite crystal forms, the purple, red and yellow moissanite gemstones mentioned in the patent document are difficult to obtain large-scale quantitative production
In addition, the dopant atoms used in this patent document are only N and Al, so the color types are also very limited.

Method used

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  • Colored moissanite gemstone and preparation method thereof
  • Colored moissanite gemstone and preparation method thereof
  • Colored moissanite gemstone and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1, deep champagne color moissanite gem, preparation method is as follows:

[0048] The seed crystal is placed at the bottom of the upper cover of the crucible, and the SiC powder doped with dopant VC 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 of C are transported to the surface of the seed crystal at a lower temperature, and through deposition, the crystal grows continuously, and at the same time, the V doping amount reaches an atomic concentration of 1×10 17 / cm 3 ~1×10 18 / cm 3 , to get deep champagne color moissanite gemstones, such as figure 1 shown.

Embodiment 2

[0049] Embodiment 2, dark green moissanite gem, preparation method is as follows:

[0050] The 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. During the 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 ~2×10 20 / cm 3 , to get a dark green moissanite gem. Such as figure 2 shown.

Embodiment 3

[0051] Embodiment 3, brown moissanite gem, preparation method is as follows:

[0052] It can be achieved by controlling the concentration of background impurity elements in 6H-SiC. It is only necessary to ensure that the concentration ranges of background impurity elements N (n-type), B, and Al (p-type) in moissanite crystals are 1×10 17 / cm 3 ~5×10 17 / cm 3 , 1×10 16 / cm 3 ~2×10 17 / cm 3 , 5×10 15 / cm 3 ~5×10 16 / cm 3 , place the seed crystal at the bottom of the upper cover of the crucible, and place the high-purity SiC powder 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. Thereby obtaining brown moissanite gemstones such as image 3 shown. ...

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Abstract

The invention relates to a colored moissanite gemstone and a preparation method thereof. According to the invention, impurity elements with different types are doped in 6H-SiC or 4H-SiC, such that the moissanite gemstone can be prepared. The impurity elements comprise background impurity elements N, B, and Al, and / or one or two intentionally doped impurity elements selected from Ti, V, Ni, N, and Ce. The preparation method of the colored moissanite gemstone comprises the steps that: seed crystal is placed on the bottom of an upper cap of a crucible; high-purity SiC powder or SiC powder with a doped doping agent is placed at the bottom of the crucible; and sublimation growth is carried out with a growth chamber pressure of 50-120mbar and a temperature increased to 2000-2500 DEG C. With the method, the prepared colored moissanite gemstones have uniform color and good transparency.

Description

technical field [0001] The invention relates to a colored moissanite gemstone and a method for synthesizing the colored moissanite gemstone, belonging to the technical field of artificial synthetic gemstones. Background technique [0002] Moissanite (scientific name silicon carbide, also known as Moissanite) was first discovered from meteorites by Nobel laureate Dr. Henri Moissan, and was successfully developed in the laboratory in 1980. After more than 30 years of scientific and technological research and development, the synthesis technology of moissanite has been quite mature. The national standard GB / T16552-2010 of the People's Republic of China clearly states that "synthetic gemstones are crystalline bodies, amorphous bodies or aggregates that are completely or partially manufactured artificially and have known counterparts in nature. The corresponding natural jewelry and jade are basically the same." Synthetic moissanite gemstones should belong to crystal body synthe...

Claims

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Application Information

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IPC IPC(8): C30B29/36C30B23/00
Inventor 徐现刚付芬胡小波魏汝省
Owner SHANDONG UNIV
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