The most popular processes for the production of synthetic diamonds are: â€¢ High-Pressure High-Temperature Technique (HPHT) â€“ This is a widely used method for the preparation of synthetic diamonds. The technique uses a high pressure of approximately five GPa and a high temperature of about 1,500 Â°C. This is a relatively cost-effective process. This technique uses large presses to produce such high pressure and high-temperature conditions. â€¢ Chemical Vapor Deposition (CVD) method â€“ The method is used to prepare synthetic diamonds from a gaseous mixture of various hydrocarbons. In this method, carbon plasma is created on the substrate. This plasma is accumulated in the substrate and forms a diamond.
Structure of synthetic diamond
In both synthetic and natural diamonds, the carbon atoms are sp3 hybridized. The geometry of carbon atoms in a diamond is tetrahedral. One carbon atom is bonded to four other carbon atoms by single covalent bonds. The carbon-carbon bond length in this three-dimensional network system is 154 pm. The bond angle between the two carbon-carbon bonds is 109Â° 28â€™.
Structure and geometry of synthetic diamonds
The most important factor that decides the quality of a diamond is the absence of crystal flaws. The various properties of synthetic diamonds are: â€¢ Hardness: Diamonds are very hard in nature. This is because a diamond contains strong carbon-carbon covalent bonds are very strong covalent bonds. Diamonds have a high density. â€¢ Melting point: The melting point of synthetic diamonds is high. A higher amount of heat energy is required to break the strong bonds in a diamond, which results in a higher melting point. â€¢ A bad conductor of electricity: Diamonds are bad conductors of electricity as all the valence electrons are involved in chemical bonding. As a result, there is no availability of free electrons to conduct the electric current in the structure. â€¢ Thermal conductivity: Diamonds are good conductors of heat as they have a packed crystal structure.
Uses of synthetic diamonds
â€¢ Diamonds are widely used in abrasives. â€¢ Diamonds are used as polishing and cutting tools. â€¢ They are used in heat sinks and many heating appliances. â€¢ Diamonds are used in electronic devices like high-power switches, light-emitting diodes, and high-frequency field-effect transistors. â€¢ They are used as a detector for ultraviolet (UV) light and high energy particles. â€¢ Since diamonds are the hardest substance ever known, they are used for drilling rocks. â€¢ Because of this unique combination of high stability, high optical transparency and low thermal expansion in synthetic diamonds.
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