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It is probably an unexplored system, but is there anything known about the low temperature thermodynamic equilibrium state of this?

By 'tantalum carbide', I mean $\ce{TaC}$, and by potassium polyselenides, any composition from $\ce{K2Se}$ to pure $\ce{Se}$.

Some useful properties include:

  • Equilibrium compositions at absolute zero temperature.
  • Coordination of each element in every phase present and on grain boundaries.
  • Formation enthalpies.
  • Densities.

Alternatively, if nothing can be said about any of the above, what are the most promising methods to study related phases?

  • Can chemical vapor deposition be done to mix the elements uniformly?
  • Which reliable computational models help with understanding?
  • Are there any related phase diagrams?
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  • $\begingroup$ Low temperature? I'd be surprised if even molten selenide did anything to TaC. $\endgroup$
    – Mithoron
    Commented Apr 11 at 19:33
  • $\begingroup$ But tantalum diselenide seems interesting. $\endgroup$
    – Mithoron
    Commented Apr 11 at 19:41
  • $\begingroup$ It isn't about, if it does, but about the lowest energy configuration, which may be obtained indirectly using other precursors. @Mithoron $\endgroup$
    – Paul Kolk
    Commented Apr 11 at 19:44
  • $\begingroup$ So I guessed, but how likely is, say, TaS2 + K2C2 to be thermodynamically favourable? Well, maybe potassium salts of selenoacids would be better, but still... $\endgroup$
    – Mithoron
    Commented Apr 11 at 21:32
  • $\begingroup$ Still, it's interesting and I wouldn't mind being proven wrong ;) $\endgroup$
    – Mithoron
    Commented Apr 11 at 22:09

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