Chemical synthesis of diamonds how diamonds are formed

How diamonds are formed
The hardest diamond in nature artificial diamond formation: there are two methods of synthetic diamond, namely, high temperature and high pressure method and chemical vapor deposition method. Most diamonds are formed under geological high temperature and pressure. The pressure for diamond formation is 4.5 to 6gpa and the temperature is 1100 to 1500 ℃How to make your own diamonds
What you want to know is the technology of synthetic diamond, which is mainly to cultivate diamonds by imitating the environment in which natural diamonds grow. In terms of crystal growth, synthetic diamonds can be roughly divided into three ways: high temperature and high pressure method, shock wave method and chemical vapor precipitation methodSynthetic method of synthetic diamond
2. Chemical vapor deposition synthesis method: after heating natural gas and nitrogen, a carbon plasma is formed in a pressure chamber the size of a dishwasher. The plasma is continuously deposited on the carbon bottom layer at the bottom of the pressure chamber, and gradually accumulates and hardens to form diamond flakes, which are then cut into gem shapesSynthesis of CVD diamond
And gradually accumulate and harden to form diamond flakes, which are then cut into gem shapes High quality yellow diamond with a size of 8.2mm. The sample is the largest artificial diamond single crystal in weight and size in the mainland at present. This achievement marks the leading position in the field of synthetic diamonds (gem grade diamonds) in ChinaHow to synthesize diamonds in the laboratory
Through HPHT method, the crystal structure of graphite is destroyed and reorganized, and diamonds can be formed within a few days. However, these diamonds are not as pure as natural diamonds because metal catalysts are involved in the reaction system. Another method for synthesizing diamonds is chemical vapor deposition (CVD)Diamond synthesis by high temperature and ultra high pressure method
As early as the late 18th century, it was confirmed that both diamonds and graphite were composed of carbon. Later, the research on synthetic diamonds began. After a long period of hard work, artificial diamonds were synthesized in the laboratory in the middle of the 20th century. At the initial stage, synthetic diamonds were only of abrasive grade. China also synthesized abrasive grade diamonds in the 1960sHigh temperature and high pressure method - synthetic diamond
Therefore, the artificially grown diamonds are mostly cubic octahedral aggregatesSynthesis of gemstones by chemical vapor precipitation
The method and identification of synthesizing opal, turquoise, lapis lazuli, malachite and other polycrystalline gem materials by chemical liquid-phase precipitation method have been introduced in the gem monograph of this book. This section mainly introduces the process of synthesizing polycrystalline diamond film, large particle diamond and carbon silica single crystal materials by chemical vapor precipitation method (CVD method for short)Synthesis of single crystal diamond by chemical vapor deposition
There are several methods to synthesize diamond by chemical vapor precipitation, such as hot wire method, flame method, plasma jet method and microwave plasma method, but the most commonly used method is microwave plasma method. This is a synthetic method under high temperature (800 ~ 1000 ℃) and low pressure (104pa)How is diamond cultivation formed
(4) Seed cultivation size: free carbon atoms will be attracted by the nearby carbon atom structure, so they will gradually attach to the diamond seed, combine with the carbon atoms of the diamond seed to form new chemical bonds, so as to make the seed grow gradually