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Synthetic Diamond

 
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 Synthetic diamond is diamond produced through chemical or physical processes in a laboratory. Like naturally occurring diamond it is composed of a three-dimensional carbon crystal. Synthetic diamonds are also called cultured diamonds, manufactured diamonds, and artificial diamonds.
 
 History
 
Synthetic diamonds were first produced on February 16, 1953 in Stockholm, Sweden by the QUINTUS project of ASEA, Sweden's major electrical manufacturing company using a bulky apparatus designed by Baltzar von Platen. Pressure was maintained within the device at an estimated 83,000 atmospheres for an hour. A few small crystals were produced. The discovery was kept secret.
 
 Nevertheless, General Electric researchers reported their own successful diamond synthesis in Nature. The production of smaller synthetic diamonds and especially diamond dust has become an important industry with General Electric at the forefront. General Electric, along with Sumitomo Electric and De Beers marketed their synthetic stones as heat sinks for electronics and used them solely for research purposes. Significantly, the majority of these synthetic diamonds are not of gem quality.
 
 As of 2004, two companies have introduced high-quality synthetic diamonds to the general market.

While visiting Moscow in 1995 someone asked Carter Clarke if he wanted to buy a diamond making machine. He brought the machines and the scientists to Sarasota, Florida and started the first diamond making company, Gemesis. Gemesis grows diamonds in high-pressure, high-temperature crystal growth chambers that resemble washing machines. The device bathes a tiny sliver of natural diamond in molten graphite at 1500 ºC and 58,000 atm. This produces a 2.8-carat rough diamond which can be cut to 1.5 carats. Gemesis diamonds have a yellow tint which is rare in natural diamonds and therefore a valuable aesthetic trait. The yellow tint occurs when less than five out of each 100,000 carbon atoms in the diamond crystal lattice are replaced with nitrogen atoms. Technically it is a contaminant, but colored diamonds can still be sold for more money because they can be made more quickly, they cost less to manufacture, and they are very popular.

 
  A second company, Boston, Massachusetts based Apollo Diamond, uses the low-pressure technique of chemical vapor deposition (CVD) to produce larger, less expensive diamonds with greater control over impurities. The diamond produced is a single crystal, as opposed to the polycrystalline patchworks formerly produced by CVD. This greater measure of control allows Apollo Diamond to produce diamonds of various colors, from pink to black. The ability to control the intentional introduction of impurities, doping, is necessary for the creation of diamond semiconductor devices.

 

 
Uses
 
Given the extraordinary set of physical properties diamonds exhibit, large, cheap diamonds could have a wide ranging impact in many fields.
 
The CVD produced diamonds have been targeted for their potential use in technology. For example, University of Wisconsin, Madison chemistry professor Robert Hamers has developed a photochemical methods for covalently linking DNA to the surface of polycrystalline diamond films produced through CVD. Also, the diamonds have been shown to detect redox reactions that can't ordinarily be studied and in some cases degrade redox-reactive organic contaminants in water supplies.
 
The diamonds also have potential uses in the semiconductor industry. This is because the diamonds can be "doped" with impurities like boron and phosphorus. Since these elements contain one more or one less electron than carbon, they turn the diamonds into n-type or p-type semiconductors. There are also studies being conducted about impregnating boron-doped CVD diamonds with deuterium yields to produce n-type semiconducing diamonds.
Both types of diamonds mentioned above are visually indistinguishable from the naturally occurring ones. However, the companies have taken steps to ensure that they can be distinguished by laser inscription, trace impurities, and infrared and X-ray spectroscopy. The diamonds are being marketed at $4,000 per carat, or roughly 30% less than the price of a comparable natural diamond. The traditional diamond industry is evaluating countermeasures to these cheaper alternatives. (sources : Wired.com, Chemical and Engineering News: The Many Facets of Man-Made Diamonds).


 
 
 
 
 
 

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