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How do I determine if a Metal Fluoride is soluble in liquid Gallium and under what conditions the Metal Fluoride will stay in solution in the liquid Gallium?

I am involved in a project that is testing approaches to using CVD to form a graphene layer on liquid Gallium. Fluorine has been used in the process to disassociate methane into carbon and hydrogen and to speed the deposition of carbon. In our project, we are using Acetelyne.

We want to try a different approach of adding a small amount of Fluorine into the liquid gallium itself. With the energies involved it should allow a small amount of F to interact with the process at the surface. I am familiar with all the other aspects but I have never dealt with trying to dope liquid gallium with Fluorine.

My thought was to add a Metal Flouride to liquid Gallium at an appropriate temp/pressure to have it dissolve in the liquid metal. The resulting liquid would be used as a base for deposition at temperatures between 200c to 700c at varying plasma energy levels.

I am considering a few options; SnF2, GaF3, and NaF

Gallium Fluoride would be the best for my application, but the other two are easier to obtain and should still work.

This is going to be < 1 milligram of Metalic Fluoride compound per gram of Gallium and never more than 10 grams of the resulting product at any time.

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  • $\begingroup$ If the person who voted this question down would give me some feedback I would be happy to improve the question. Without that, I have no idea what the issue is. $\endgroup$
    – drobertson
    Jul 20 '19 at 18:33
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    $\begingroup$ Well, you can see some reasons if you hover mouse over downvote button. Also downvoting is made specifically to criticise in a simple and anonymous way. I'm considering downvoting myself as this seems kinda too broad; also what's the context of this experiment? BTW Salts in general aren't particularly soluble in metals (maybe enough for it to be doable though), and fluorides are especially "salty". $\endgroup$
    – Mithoron
    Jul 20 '19 at 20:51
  • $\begingroup$ I am involved in a project that is testing approaches to using CVD to form a graphene layer on liquid Gallium. Fluorine has been used in the process to disassociate methane into carbon and hydrogen and to speed the deposition of carbon. We want to try a different approach of adding a small amount of F into the liquid gallium itself. With the energies involved it should allow a small amount of F to interact with the process at the surface. I am familiar with all the other aspects but I have never dealt with trying to dope liquid gallium with Fluorine. I can add this to the question if it helps. $\endgroup$
    – drobertson
    Jul 20 '19 at 20:59
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    $\begingroup$ @drobertson Dissolving metal fluorides in Ga indeed leads to new compounds; unclear though, if / how interfering here. A search by Na, F, Ga as the only 3 permitted elements in the COD (crystallography.net/cod/index.php) leads to F14Ga3Na5 (researchgate.net/publication/…). Search for Ga + F as the only ones leads to GaF3 by reaction of Ga with NH4F (researchgate.net/publication/…). $\endgroup$
    – Buttonwood
    Jul 21 '19 at 21:12
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    $\begingroup$ @Buttonwood I would be starting with lab-grade GaF3 if I used it and attempting to dissolve it into liquid Gallium. I can do a fairly good job of isolating it during this process. Later it would be interacting with H and C in a low vac/Ar environment. Small amounts of other contaminants are likely to be involved, but we are working to limit that.It looks like NaF wouldn't b e the way to go. Crystals would interfere. The Fluorinated Ga solution needs to completely stay in a liquid state. This is helpful, thanks. $\endgroup$
    – drobertson
    Jul 21 '19 at 21:25

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