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Classification of diamonds
2022-12-19 15:20:08
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According to whether the diamond contains N or does not contain N, the diamonds
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According to whether the diamond contains N or does not contain N, the diamonds are divided into type I diamonds and type II diamonds, and then divided into type Ia diamonds and type Ib diamonds according to the different forms of the original N in the crystal lattice.
Diamonds are divided into type IIa diamonds and type IIb diamonds according to whether they contain P or contain P.
Type I Diamond | Type II Diamond | |||
TypeⅠa | TypeⅠb | Type Ⅱa | Type Ⅱb | |
The N content is 0.1%-0.3%, and N exists in the form of small aggregates in the diamond crystal. | The N content is<0.1%, and the N is in a separate dispersed state in the diamond crystal. | No N, no P | No N, a small amount of P | |
color | white,fancy vivid yellow | white、fancy light yellow、brown | white、brown、pink | blue、gray |
Type Ia diamonds:
N atoms come in the form of N atom pairs or N3 centers, the more N3 centers, the yellower the diamond. 98% of natural diamonds are type Ia.
Type Ib diamonds:
N atoms exist alone, most of which are synthetic diamonds. Under certain temperature, pressure and time, type Ib can be transformed into type Ia diamond.
Type IIa diamonds:
N atoms exist in a free state and have good thermal conductivity. The thermal conductivity at room temperature is 5 times that of copper. It is an excellent heat dissipation material in the electronics industry.
Type IIb diamonds:
It is a semiconductor, the only one among diamonds that can conduct electricity, and can be used as a thermal sensor to measure temperature.
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