Method for determining crystal orientation of CVD diamond

Abstract

The invention relates to the technical field of diamonds. The invention further discloses a method for determining the crystal orientation of a CVD diamond. The method comprises the following steps: step 1, preparing raw materials and tools: a monochromatic laser, a helium-neon laser, a half-wave plate, a CVD diamond single crystal, a scanning electron microscope, a silicon photoelectric detectorand a screen, checking and correcting the monochromatic laser, the helium-neon laser, the scanning electron microscope and the silicon photoelectric detector to ensure that the raw materials and toolscan be normally used, and checking whether the half-wave plate and the CVD diamond single crystal are intact; and step 2, carrying out data acquisition: firstly, fixing the CVD diamond single crystalon a platform, irradiating the CVD diamond single crystal through the monochromatic laser, enabling light beams of the CVD diamond single crystal to be positioned on the same straight line, and irradiating the CVD diamond single crystal through laser generated by the monochromatic laser in a normally open mode. According to the method for determining the crystal orientation of the CVD diamond, the spatial orientation of a crystal face in the crystal and the easy-to-grind direction of the crystal face can be conveniently determined, and the orientation precision can meet the production requirement.

Description

technical field [0001] The invention relates to the technical field of diamond, in particular to a method for determining the crystal orientation of CVD diamond. Background technique [0002] Since CVD diamond does not contain any metal catalysts, its thermal stability is close to that of natural diamond. Like high temperature and high pressure artificially synthesized polycrystalline diamond, CVD diamond grains are also arranged in disorder, without brittle cleavage planes, so they are isotropic. [0003] Diamond crystals belong to the planar cubic crystal system. Due to the difference in atomic arrangement and atomic density on each crystal plane and the distance between crystal planes, the anisotropy of natural diamond crystals is caused. The three main crystal planes of diamond crystals are (100 ), (110), (111), the degree of anisotropy of each crystal plane is different, and the (100) crystal plane has the most serious anisotropy. Diamond not only has different physica...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for determining the crystal orientation of CVD diamond, which has the advantages of being convenient to determine the spatial orientation of the crystal plane in the crystal and the good grinding direction of the crystal plane, and the orientation accuracy can meet the production needs, etc. , which solves the problem that the existing CVD diamond crystal orientation method is complicated to operate and cannot meet the production needs