Dielectric constants measured at room temperature under 1000 Hz are 5.5 for diamond and 10 for...
Dielectric constants measured at room temperature under 1000 Hz are 5.5 for diamond and 10 for graphite. Both diamond and graphite are single elemental crystals of carbon, why do their dielectric constants differ so much?
Homework Answers
Even though Carbon and Graphite both are allotropes of carbon, their structures differ i.e. the way these carbon atoms are arranged in these elements are completely different as can be seen in the figure.
In the case of Graphite-
The carbon atoms share a covalent bond with only 3 nearby carbon
atoms which form a hexagonal layered network kind of pattern. Now
since, Carbon has 4 free valencies, out of which only 3 are
occupied, the 4th valence electrons remain delocalised which
therefor increase the conductivity of graphite and hence, has a
higher dielectric constant.
Whereas, in the case of diamond-
The carbon atoms make bond with the other 4 carbon atoms and hence
there is no free electron to enable electron flow. This results in
a smaller dielectric constant
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