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4hv.org :: Forums :: Chemistry
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Impossible compounds?

Author Post
Conundrum
Mon Oct 03 2016, 08:25AM Print View
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: People's Democratic Republic of Guernsey
Posts: 3676
Hi.
I read somewhere that lead carbide (PbC2) is not possible due to a very high thermodynamic barrier that encourages less energetic compounds to form.

Interestingly anecdotal reports of its accidental production by melting of BiPb alloy (eutectic) in a helium atmosphere in a SiC/C reinforced crucible at over 1000C suggest that it might be feasible to produce some this way.

So far one suggestion that did come up is to use cleaned and treated pyrolytic carbon and bismuth/lead alloy in close proximity then focus several dozen W of blue laser light under pure helium onto the underside of the carbon in a strong electric field over tens of hours with a refractory tantalum counter-electrode hoping to form the desired PbC2:Bi intermediate alloy by forced electromigration at 980C

Intriguingly if PbC2:Bi was stable it could be a candidate for a high temperature superconductor as the anomalous electron configuration might encourage the formation of d waves with the Pb dampening down the troublesome charge-density waves that normally prevent superconductivity, in this case the electrons and holes might balance exactly.
This could also happen at a very narrow range of temperatures, possibly less than 0.05K although well above room temperature.

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