The Naked Scientists

The Naked Scientists Forum

Author Topic: Can Diamonds be melted to liquid?  (Read 7148 times)

Seany

  • Hero Member
  • *****
  • Posts: 4210
  • Live your life to the full!
    • View Profile
Can Diamonds be melted to liquid?
« on: 17/04/2007 10:34:07 »
Can Diamonds be melted to liquid? It isn't a metal, like Gold, it's merely a pretty rock - Well I think so.

So can it be melted to a liquid? And would it have the same properties as a diamond, except for the fact that it is now a liquid?

If so, what are the melting points?

paul.fr

  • Guest
Can Diamonds be melted to liquid?
« Reply #1 on: 17/04/2007 11:25:29 »
not sure if you can, but seeing as diamonds are made of carbon and to be a diamond the carbon atoms have to be in a special order or stacking relative to each other. 

if you melt a diamond the carbon atoms are no longer in this special order and when it cools back down they do not return to the original stacking.

There are other forms of carbon, such as graphite and amorphous carbon.  Most likely you would end up with amorphous carbon.



lightarrow

  • Hero Member
  • *****
  • Posts: 4303
    • View Profile
Can Diamonds be melted to liquid?
« Reply #2 on: 17/04/2007 13:24:43 »
Can Diamonds be melted to liquid? It isn't a metal, like Gold, it's merely a pretty rock - Well I think so.
So can it be melted to a liquid?
Yes, at T > 4000C and P ≈ 200 atm, at least according Fig. 10.14 in this document:
http://edu.sm.chim.unifi.it/prs/CFA/fig10.pdf
The temperature depends on the pressure. For example, to melt it at 2000 C you need ≈ 500,000 atm!
Quote
And would it have the same properties as a diamond, except for the fact that it is now a liquid?
Absolutely not, as all liquids are completely different from the corresponding solids. Just think about all the optical properties that depends upon the cristalline structure (which you don't have anylonger in the liquid).

Seany

  • Hero Member
  • *****
  • Posts: 4210
  • Live your life to the full!
    • View Profile
Can Diamonds be melted to liquid?
« Reply #3 on: 17/04/2007 14:09:59 »
Hmm.. Thanks Light.

 

SMF 2.0 | SMF © 2011, Simple Machines