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Method for artificially synthesizing large single crystal of columnar diamond

A kind of artificial synthesis and diamond technology, which is applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc. It can solve the problems of difficult to meet, difficult to process diamond materials, and increased difficulty in utilization, and achieve low cost and high crystal quality. Excellent effect of reducing application difficulty

Inactive Publication Date: 2019-07-26
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the difficulty in processing diamond materials, this increases the difficulty of utilization, and it is difficult to meet the demand for large single crystals of diamonds with special shapes in certain fields.

Method used

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  • Method for artificially synthesizing large single crystal of columnar diamond
  • Method for artificially synthesizing large single crystal of columnar diamond
  • Method for artificially synthesizing large single crystal of columnar diamond

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 artificially synthesized columnar diamond plate crystal

[0029] Under the condition of temperature of 1280-1300℃, the synthesis was carried out for 24 hours by using {100} seed crystals with a length of 2.6 mm and a width of 0.8 mm. The shape of the large diamond single crystal synthesized under this condition is a columnar shape with a length of 5.0 mm, a width of 3.1 mm and a height of 2.0 mm, with good symmetry. The optical microscope photo of the synthesized large diamond single crystal is shown in figure 2 .

Embodiment 2

[0030] Embodiment 2 artificially synthesized columnar diamond lamellae

[0031] At a temperature of 1280-1300°C, a seed crystal with a length of 2.5 mm and a width of 0.5 mm was used for 12 hours of synthesis. Under this condition, the shape of the synthesized diamond large single crystal is 4.3 mm in length and 2.5 mm in width. A columnar shape with a height of 1.7 mm and good symmetry. The optical microscope photo of the synthesized large diamond single crystal is shown in image 3 .

Embodiment 3

[0032] Embodiment 3 artificially synthesized columnar diamond lamellae

[0033] Under the condition of a temperature of 1280-1300° C., a seed crystal with a length of 2.0 mm and a width of 0.5 mm was used for 29 hours of synthesis. The shape of the large diamond single crystal synthesized under this condition is a columnar diamond large single crystal with a length of 3.2 mm, a width of 1.7 mm, and a height of 1.0 mm. The optical microscope photo of the synthesized large diamond single crystal is shown in Figure 4 .

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Abstract

The invention discloses a method for artificially synthesizing a large single crystal of a columnar diamond, and belongs to the technical field of diamond single crystal growth in crystal growth. Thelarge single crystal of the columnar diamond comprises a columnar diamond lamellar crystal and a columnar diamond, the crystals are elongated, and the length-width ratio of each crystal is 1.05-2.0. The large single crystal of the columnar diamond is synthesized by a high-temperature and high-pressure gradient method, synthesis pressure is 5-6GPa, the center temperature of a cavity is 1260-1360 DEG C, synthesis time is 10-30 hours, a seed crystal is provided with an elongated crystal face, and the length-width ratio of the seed crystal is 1.5. The large single crystal of the columnar diamond is directly synthesized, bulk machining of the diamond is avoided before the diamond is used, and requirements in some fields for the columnar diamond are met. The quality of the crystal synthesized bythe method does not have obvious defects, a shape of the crystal is regular and symmetric, the method is simple to operate and low in cost and has repeatability, and mass production requirements canbe met.

Description

technical field [0001] The invention belongs to the technical field of diamond single crystal growth in crystal growth, and in particular relates to a method for artificially synthesizing large columnar diamond single crystals. Background technique [0002] Diamond material is a kind of extreme multi-functional material integrating many excellent properties, which combines excellent electrical, optical and thermal properties and has great mechanical hardness. Therefore, diamond has a wide range of applications in many fields. Especially with the development of synthetic diamond large single crystal technology, the size of synthetic diamond has been increased, and the application field of diamond materials has been further broadened. [0003] At present, the synthesis of large diamond single crystals mainly relies on the high temperature and high pressure temperature gradient method. The principle of this method is that the carbon source, catalyst, seed crystal and crystal ...

Claims

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Application Information

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IPC IPC(8): C30B29/04C30B11/14
CPCC30B11/14C30B29/04
Inventor 贾晓鹏王遥马红安
Owner JILIN UNIV
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