Cobalt Carbonate
Formula: CoCO3
| DENS - Density (Specific Gravity) |
4.1 |
| MLPT - Melting Point (MP) |
Co3O4 D |
A pinkish tan powder. It is a strong colorant and almost always produces blue in glazes (unless in very high percentages where it is black). Cobalt carbonate is an extremely active melter (even more than cobalt oxide), in a mix of 50% Ferro frit 3134 it will boil at cone 6. The carbonate form of cobalt is very fine grained and disperses better in the glaze slurry and the glaze melt, it gives more more evenly distributed color than cobalt oxide. However, as with any carbonate, it produces gases as it decomposes and these can cause pinholes or blisters in glazes if they need to escape at the time when the glaze needs to solidify. Also the carbonate form contains less cobalt per gram, therefore colors are less intense than the oxide form.
Supplies of this material often differ in shade (lighter and darker).
Available grades of Cobalt Carbonate are not actually CoCO3 but a mix of the carbonate and the hydroxide. Cobalt II carbonate theoretically would have the formula: CoCO3.3Co(OH)2.H2O.
Manufacturer information sheets often quote the percentage of Co instead of CoO (thus a lower amount in the range of 45-47%. Trace elements like Ni, Fe, Mn, Cu, Zn, Pb and Mg are quoted but none are in large enough amounts to worry about in ceramics. Na can be 0.5%. Products are sold based on Co content, higher purity grades may have only 1 or 2% higher Co content. Particle size can be about 2.5 microns.
The carbonate is produced from a liquid reaction between cobalt II acetate and sodium carbonate to produce red violet crystals that are recovered by filtration. The material is insoluble in cold water but will decompose in hot water.
Out Bound Links
- (Hazards - General)
Cobalt Toxicology
The hazards of cobalt materials in the ceramic ind... - (Typecodes)
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1: CLT - Colorant
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In Bound Links
Pictures
Metallic oxides with 50% Ferro frit 3134 in crucibles at cone 6ox. Chrome and rutile have not melted, copper and cobalt are extremely active melters. Cobalt and copper have crystallized during cooling, manganese has formed an iridescent glass.
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Cobalt Carbonate" descrip="" searchkey="Spherocobaltite, CoCO3, Cobalt(II) carbonate" loi="0.00" casnumber="7542-09-8">
<oxides>
<oxide symbol="CoO" name="Cobalt Oxide" status="" percent="63.000" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="CO2" name="Carbon Dioxide" percent="37.000" tolerance=""/>
</volatiles>
</material> | 
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