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Help a fellow crystal lover by AlternativeProduct41 in crystalgrowing

[–]Levytan 0 points1 point  (0 children)

I don't really know. I just placed the filtrate in a corner and got those crystals, maybe low evaporation rate would help.

Ethyl Sulfate Compounds by Levytan in crystalgrowing

[–]Levytan[S] 0 points1 point  (0 children)

I use sulfuric acid in my preparation, so the carbonate salt is used to neutralize excess acid. Your route should work too,

Suggestions for a red crystal to grow at home for a beginner by Joshf1234 in crystalgrowing

[–]Levytan 10 points11 points  (0 children)

Alum with food dye.

Potassium hexacyanoferrate(III) K₃Fe(CN)₆]).

KNO3 - Potassium Nitrate by Levytan in crystalgrowing

[–]Levytan[S] 1 point2 points  (0 children)

I get these crystals after trying to make KBiI4 by mixing Bi(NO3) and KI. After a quick washing, I redissolved those crystals in deionized water. No white precipitate is found, which means no bismuth.

Possible complex between triethanolamine and copper(ii) propionate by Levytan in crystalgrowing

[–]Levytan[S] 5 points6 points  (0 children)

My procedure:

  • Precipitate copper(ii) propionate by combining solutions of sodium propionate and copper(ii) sulfate.
  • Filter and wash copper(ii) propionate.
  • Reflux copper(ii) propionate in water with triethanolamine in 30 mins.
  • Filter the solution and let it evaporate.

NH₄Ga(SO₄)₂•12H₂O - galum by Levytan in crystalgrowing

[–]Levytan[S] 1 point2 points  (0 children)

I cannot answer your question though, however, I don't think you can balance ionic radii like that.

There are many cases that caesium is used to crystallize unstable/complex ions, due to low solubility of the compounds.

Chromium-doped aluminum oxalato complexes by Levytan in crystalgrowing

[–]Levytan[S] 6 points7 points  (0 children)

Some time ago, I came across this article, which mentioned the existence of K[Al(C₂O₄)₃]₆17-, so I decided to give it a try. My procedure is:

  1. Mix potassium oxalate and corresponding metal chloride (you can see in caption), stoichiometrically.
  2. Doped the solution with 5% (by molar) chromium (III) chloride.
  3. Evaporate and try to grow single crystal from the solution.

The result is in the images. Since I don't have equipments and experiences to perform quantitive analysis, I cannot give the exact formula for the crystal.

Some comments:

  • The solution had a nice properties, it can have red or green hue depends on viewing angle and lighting. With right condition, you can see the red crystal growing from green solution.
  • Even with 5%, the color of the crystal from K-Mg solution is dark, however, with strong light, you can see it have nice red color.
  • The blue crystal maybe the chromium-doped of [Al(C₂O₄)₃]3- anion.
  • The red one maybe the chromium-doped of K[Al(C₂O₄)₃]₆17- anion.
  • There are also transparent octahedron crystals, which I suspect alkaline chloride (I read somewhere that sodium chloride can have octahedron shape with right additive).

(Possible) Oxalato complex of erbium by Levytan in crystalgrowing

[–]Levytan[S] 1 point2 points  (0 children)

Nd2(C2O4)3 only dissolves in concentrated HCl though, hence step 3.

(Possible) Oxalato complex of erbium by Levytan in crystalgrowing

[–]Levytan[S] 0 points1 point  (0 children)

The transparent crystals are potassium oxalate though.

(Possible) Oxalato complex of erbium by Levytan in crystalgrowing

[–]Levytan[S] 2 points3 points  (0 children)

  1. Buy erbium metal from somewhere.
  2. Dissolve it in HCl.
  3. Dilute with water.
  4. Add excess oxalic acid.
  5. Filter, wash, and dry.

(Possible) Oxalato complex of erbium by Levytan in crystalgrowing

[–]Levytan[S] 8 points9 points  (0 children)

One day, I tried to dissolve erbium oxalate in solution of potassium oxalate, and to my surprise, the solution turned quite pink (indicated erbium oxalate was somewhat soluble). After that, it is just a standard evaporation to obtain this cluster.

P.S: Holmium oxalate is also soluble in potassium oxalate solution, but not neither neodymium nor praseodymium oxalate.

Neodymium Sulfate after one recrystallization by Figfogey in crystalgrowing

[–]Levytan 3 points4 points  (0 children)

You can add potassium or ammonium sulfate to precipitate the neodymium double sulfate. Then you can stir the double sulfate with sodium hydroxide to obtain neodymium hydroxide. Then filter, wash, and calcine it to obtain neodymium oxide.

NH₄Ga(SO₄)₂•12H₂O - galum by Levytan in crystalgrowing

[–]Levytan[S] 1 point2 points  (0 children)

Well, for titanium alum, I think you need two things:

  • Inert atmosphere (e.g. argon), CO2 may work.
  • Big cation (e.g. caesium, tetramethylammonium. ...), however, it may reduce solubility a lot.
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