Abstract
IT is a common opinion that diamond is an insulator at room temperature. Diamonds are known to occur in two types1, classified as I and II. In 1952 it was suggested2 that type II be further subdivided into IIa and IIb; type IIa is an insulator with a resistivity of about 1016 ohm-cm., whereas type IIb is a semiconductor3. Although this semiconductivity would point to impurities, I am inclined to the view that some type of crystal imperfection may be the primary cause.
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References
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CUSTERS, J. Semiconductivity of a Type IIbDiamond. Nature 176, 173–174 (1955). https://doi.org/10.1038/176173a0
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DOI: https://doi.org/10.1038/176173a0
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