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I'm dealing with an interactive work of fiction right now, and one proposal is to combine two types of puzzles with a magnetic gas. I know that fermionic $\ce{^6Li}$, when cooled below $\pu{1 K}$, has shown verifiable ferromagnetic properties, but that is far too cold to be applicable to the work's setting.

(I'm only willing to suspend the user's belief so much.)

I know that on heating above the Curie temperature for a material, magnetic properties dissolve; but what that temperature is varies quite a bit. (I've seen them between $\pu{90 K}$ and $\pu{1400 K}$, which is pretty radical.) Has anyone yet discovered another molecule that remains magnetic in a gaseous phase? Are any of them at least hypothesized?

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    $\begingroup$ Gas, not really, but plasma has magnetic properties and (non-thermal) may have reasonable temperature. $\endgroup$
    – Mithoron
    Commented Jan 13, 2019 at 17:42
  • $\begingroup$ @Mithoron That's helpful, thank you! I was kind of hoping to fit it into a party balloon, though. It's something I can follow up on. Do you have any examples, off hand, of large-scale magnetic plasmas? $\endgroup$
    – Michael Macha
    Commented Jan 13, 2019 at 17:53
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    $\begingroup$ related chemistry.stackexchange.com/questions/27230/… chemistry.stackexchange.com/questions/33994/… $\endgroup$
    – Mithoron
    Commented Jan 13, 2019 at 19:36

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