Phase diagram of Carbon at large electric fields.

  • #1
169
13
Summary:
What are the phases of carbon at large electric fields.
I am wondering if the phase diagram of Carbon has been explored at very large electric fields.

Can one make any theoretical guesses ?

In specific I am interested in Pressure Vs Electric field and Electric field vs Temperature at fixed temperature and pressure respectively.
 

Answers and Replies

  • #2
Baluncore
Science Advisor
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What makes you think that high electric fields would make a constructive difference ?

I would be surprised if carbon could exist for long in a high electrical field gradient.
As graphite it would conduct current and get hot due to W = I²R.
Any contamination of diamond would make it a semiconductor or resistor with a similar fate.
Carbon nanotubes or Fullerenes would probably not survive at high pressure.
 
  • #3
169
13
What makes you think that high electric fields would make a constructive difference ?
I am at a very early stage of exploring this (and similar) questions. But my interest in this problem is to see if we can transition between conducting and resistive phases of carbon(or other material) by controlling electric fields.

My suspicion is that low resistance phase is unfavoured, and it will selectively crystalize into high resistance phase to minimize heat generated.

As graphite it would conduct current and get hot due to W = I²R.
At sufficiently high pressure, my guess is that carbon will melt and begin start a crystallization process into forming a diamond. This is indeed a non-equilibrium problem because of heat flow is involved. But I am imagining heat is being steadily pumped out of the system using some cooling mechanism to lower temperature.
 
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