I want to know the temperature of heating and whether I can do it in air or vacuum?
Don't know if there is some publication on this topic. Wikipedia showing at 200-250˚C.
http://en.wikipedia.org/wiki/Gallium(III)_oxide
Strong oxidation of metallic Ga to gallium (III) oxide (Ga2O3) can be expected by ~850 °C [1] or above in air or oxygen. This same oxide can also be obtained by burning liquid gallium droplets in air or oxygen. Also possible is attack of metallic Ga by concentrated aqueous HCl, to obtain dissolved GaCl3, followed by NH4OH addition to precipitate hydroxide gel. The last can be calcined around 450˚C, yielding Ga2O3. Gallium (III) oxide can be reduced to gallium (I) oxide (Ga2O) by metallic Ga.
[1] Kh.M. Al-khamis, R.M. Mahfouz, A.A.Al-warthan, M.R.H. Siddiqui, "Synthesis and characterization of gallium oxide nanoparticles", Arabian Journal of Chemistry, 2(2), October 2009, 73–77.
Journal of Phase Equilibria and Diffusion
December 2008, Volume 29, Issue 6, pp 550-551
Ga-O (Gallium-Oxygen)
H. Okamoto
http://link.springer.com/article/10.1007/s11669-008-9394-9
Thank you. It is great different between this situation and the equilibrium phase.
@Muhammad Saleem : I have annealed the Ga metal in a alumina boat at 450 deg C for 4 hours. No such change has been observed.... shiny like before.
@Vlad Voronenkov: Thanks fpr your suggestions but I have tried the same but no oxide formation occurred. Only the surface shiny nature changed a bit and it remained as the liquid Ga as before heating.
Did you mix any thing for better oxygen involvement??
Next time I have annealed the liquid Ga at 1000 C for 2 hours . Yet no change observed.
I did not get any oxide.
It was like before. Only the surface became slightly whitish.
The fact that the surface became white-ish is indicating the formation of gallium oxide formation. As with room temperature gallium forms a protective oxide layer that will inhibit it from deeper layers from being oxidized. You will have to have to break this oxide layer to get other areas to oxidize to gallium oxide.
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