Search results
Results from the WOW.Com Content Network
Synthetic diamonds are produced via high pressure, high temperature or chemical vapor deposition (CVD) technology. These diamonds have numerous industrial and commercial uses including cutting tools, thermal conductors and consumer diamond gemstones.
This low-pressure process is known as chemical vapor deposition (CVD). William G. Eversole reportedly achieved vapor deposition of diamond over diamond substrate in 1953, but it was not reported until 1962. [41] [42] Diamond film deposition was independently reproduced by Angus and coworkers in 1968 [43] and by Deryagin and Fedoseev in 1970.
In synthetic diamond grown by the high-pressure high-temperature synthesis [5] or chemical vapor deposition, [6] [7] defects with symmetry lower than tetrahedral align to the direction of the growth. Such alignment has also been observed in gallium arsenide [ 8 ] and thus is not unique to diamond.
Chemical vapor deposition (CVD) is a vacuum deposition method used to produce high-quality, and high-performance, solid materials. The process is often used in the semiconductor industry to produce thin films .
A large number of compounds belonging to practically all classes have been synthesized under hydrothermal conditions: elements, simple and complex oxides, tungstates, molybdates, carbonates, silicates, germanates etc. Hydrothermal synthesis is commonly used to grow synthetic quartz, gems and other single crystals with commercial value.
N-type diamond films are reproducibly synthesized by phosphorus doping during chemical vapor deposition. [35] Diode p-n junctions and UV light emitting diodes (LEDs, at 235 nm) have been produced by sequential deposition of p-type (boron-doped) and n-type (phosphorus-doped) layers. [36]
The company produced chemical vapor deposition (CVD) gem-sized synthetic diamond crystals using processes pioneered by Apollo Diamond, and had acquired Apollo Diamond's technology and assets including several US patents on the processes. [1]
Plasma-assisted chemical vapor deposition process involving amorphous carbon; Controlled oxidation of gold containing chromium or cobalt (e.g. 75% gold, 25% cobalt [3]). A range of colors from brown to black can be achieved on copper-rich alloys by treatment with potassium sulfide. [2]