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Typical examples are boron nitride (BN), WS2, MoS2, WSe2, MoSe2, and, most importantly, carbon.
The most prominent representative of this class of compounds is graphite, although nano- tubes consisting of boron nitride (BN), the sul?
Boron nitride (BN) is isostructural with graphite; however, with one important difference: in BN, one observes single bonds only, as nitrogen as well as boron are both in their three valency state.
Hence, there are no free electrons, with the consequence that bulk BN is an isolator.
(BN nanotubes, however, are wide-band semiconductors.)
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