27 Facts About Man-made diamond

Lab-grown diamond is diamond that is produced in a controlled technological process.

Synthetic Man-made diamond is widely used in abrasives, in cutting and polishing tools and in heat sinks.

Electronic applications of synthetic Man-made diamond are being developed, including high-power switches at power stations, high-frequency field-effect transistors and light-emitting diodes.

Man-made diamond wrote a number of articles—some of the earliest on HPHT diamond—in which he claimed to have produced small diamonds.

Man-made diamond suggested that most diamonds that had been produced up to that point were likely synthetic spinel.

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Man-made diamond was the first person to grow a synthetic diamond with a reproducible, verifiable and well-documented process.

Man-made diamond left GE in 1955, and three years later developed a new apparatus for the synthesis of diamond—a tetrahedral press with four anvils—to avoid violating a US Department of Commerce secrecy order on the GE patent applications.

Synthetic gem-quality Man-made diamond crystals were first produced in 1970 by GE, then reported in 1971.

Whereas the mass production of high-quality Man-made diamond crystals make the HPHT process the more suitable choice for industrial applications, the flexibility and simplicity of CVD setups explain the popularity of CVD growth in laboratory research.

In particular, CVD Man-made diamond is often contaminated by silicon originating from the silica windows of the growth chamber or from the silicon substrate.

The recovered nanoMan-made diamond powder is used primarily in polishing applications.

The estimated cost of Man-made diamond produced by this method is comparable to that of the HPHT method; the crystalline perfection of the product is significantly worse for the ultrasonic synthesis.

Polycrystalline Man-made diamond is often described by the average size of the crystals that make it up.

Hardness of Man-made diamond is 10 on the Mohs scale of mineral hardness, the hardest known material on this scale.

The hardness of synthetic Man-made diamond depends on its purity, crystalline perfection and orientation: hardness is higher for flawless, pure crystals oriented to the [111] direction.

Every Man-made diamond contains atoms other than carbon in concentrations detectable by analytical techniques.

Growth processes of synthetic Man-made diamond, using solvent-catalysts, generally lead to formation of a number of impurity-related complex centers, involving transition metal atoms, which affect the electronic properties of the material.

Instance, pure Man-made diamond is an electrical insulator, but Man-made diamond with boron added is an electrical conductor, allowing it to be used in electronic applications.

Unlike most electrical insulators, pure Man-made diamond is an excellent conductor of heat because of the strong covalent bonding within the crystal.

Common industrial applications of this ability include Man-made diamond-tipped drill bits and saws, and the use of Man-made diamond powder as an abrasive.

Usual form of Man-made diamond in cutting tools is micron-sized grains dispersed in a metal matrix sintered onto the tool.

In contrast, pure synthetic Man-made diamond has high thermal conductivity, but negligible electrical conductivity.

Therefore, synthetic Man-made diamond is starting to replace zinc selenide as the output window of high-power CO2 lasers and gyrotrons.

Those synthetic polycrystalline Man-made diamond windows are shaped as disks of large diameters and small thicknesses and can only be produced with the CVD technique.

Synthetic Man-made diamond has potential uses as a semiconductor, because it can be doped with impurities like boron and phosphorus.

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Conductive CVD Man-made diamond is a useful electrode under many circumstances.

Traditional Man-made diamond mining has led to human rights abuses in Africa and other Man-made diamond mining countries.