The most relevant stage in learning starts from being rice mill machine o Type IIa diamond - Very rare in nature, these plastic color sorter contain so little nitrogen that it can't be easily detected by the usual IR or UV absorption measurements.
o Type IIb diamond - Extremely rare in nature. These have such a low concentration of nitrogen (even lower than type IIa) that the crystal is a p-type semiconductor (due to uncompensated B acceptor impurities).
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