Pure carbon and graphite have the same resistivity?

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Discussion Overview

The discussion revolves around the resistivity of pure carbon compared to graphite, exploring whether they share the same resistivity values. It touches on the properties of different allotropes of carbon and their implications for electrical resistance.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant questions if pure carbon and graphite have the same resistivity, providing a specific value for pure carbon.
  • Another participant suggests that graphite, being an allotrope of carbon, likely has a different resistivity due to its distinct crystal structure, comparing it to diamond, which has a high resistivity.
  • A different participant asserts that the resistivity unit provided is correct and notes that graphite's resistivity can vary based on orientation.
  • One participant acknowledges that resistivity is related to resistance but assumes that different allotropes of carbon would exhibit different resistances and resistivities.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether pure carbon and graphite have the same resistivity, with multiple competing views presented regarding the properties of carbon allotropes.

Contextual Notes

The discussion reflects uncertainty regarding the relationship between resistivity and resistance in different carbon allotropes, as well as the implications of crystal structure on these properties.

Mathysics
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I am just wondering if pure carbon and graphite have the same resistivity?

Resistivity for pure carbon = 3.5 x 10^-3Ωm:frown:
 
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I'd have to guess no on that one. Graphite is an allotrope of Carbon, so it's crystal structure is different to pure carbon, just like diamond which is another allotrope of cabon and which has a very high resistivity.

You'd have to do a search for graphite resistance and I think you should check a typo on your units mOhm, not Ohmm
 


No, Ωm is correct. This is resistivity, not resistance.

Since graphite is carbon, it's difficult to understand the question. Graphite does, however, have different resistivities in different orientations.
 


ahh, doh! but resisitivity is a function of the resistance, and hence, I would still assume that different allotropes of carbon have different resistances and resistivities.
 

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