🚀 go-pugleaf

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 Thanks to everyone who responded. Reading the answers, I guess, I
 have to be more specific. I am working on the flame process of
 making fullerenes. We have flames with fullerene yields exceeding
 20% by soot basis (Read latest special fullerene issue of _Carbon_).
 I now have this urge to play with effect of fields on the product
 structure/distribution. With this background, here are more
 constraints for the material I am looking for:
>==========================
>
> Are there materials,
> that are insulators at room temperature,
> and conductors at high temperatures?
> AND can remain intact and conductive at peak temperatures of 3800 F (2200 C)?
> Could electric field be suspended in space with electrodes of this material?
>
> If you know something, just press R. (or F, if you prefer).

 The environment is a hydrocarbon/oxygen flame. So the material has
 to be resistant to oxidizing environment.
 Assume that I can machine (or play some deposition games) the material
 into electrodes of desirable shape. This electrode would be in/near the
 oxidizing environment. Not only should the electrode not react, the electrode 
 should not be a heat sink - to avoid thermal modification of reaction.
 So to keep life interesting, the attempt would be to pass enuf current
 to keep the electrode as an ohmic heat source.....
 Such a polite interference should help keep the reaction path uniquely
 affected by the field.

 So, now, make your guess... :)

T.Y.
----
tyadav@athena.mit.edu