Quote: Originally posted by vano | Thanks. Unfortunately i don't have CrO3, i used all of them, but i will try to find it. I like beryllium carbonate idea. Also I don't have any new
ideas about beryllium chemistry, but you can tell me any experiment what you want and i will do it, no prob. If i will make chromate with way you
mentioned, then i let you know anyway. |
That's perfect! I have what I believe is a very attractive idea. To create this beryllium aluminate with a small addition of Cr3+ ion as well as a
completely different and interesting method. The method is called "Combustion synthésis", and it was discovered by accident, years ago in India. I've
never read anywhere its use for synthesizing Al2BeO4:Cr3+, but I believe 100% that it will work!! Beryllium has very similar chemical behaviour to
aluminium and when ruby powder is made this way, there's no reason why alexandrite powder can't be made this way!!! Something like "Pharaoh's snake"
comes out of the method, and you can leave it as it is, or grind it with water to powder and dry it. It'll be green in sunlight, like emerald, and
purple in artificial light at night, like amethyst, changing its colors! You can then put it in a test tube with a stopper and show it to your
visitors. Plus, the method has a very spectacular flow, the mixture will heat itself up to more than 1000 C and the hot zone will spread in it, maybe
releasing some rusty NO2 fumes. But most of all, the reaction will be over in a few minutes, so you can get the color-change gem in a few minutes!!
Isn't that cool!? Tomorrow I'll send you the exact procedure, construct an equation, calculate the necessary quantities. All you're going to need is
water, aluminium nitrate, beryllium nitrate, and some chromium nitrate, urea, and possibly, to improve the results and some glycine...
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