Strontium Carbonate
Formula: SrCO3 or SrO.CO2
| DENS - Density (Specific Gravity) |
3.6 |
| HMOH - Hardness (Moh) |
3.6 |
| MLPT - Melting Point (MP) |
723C D |
| BDLB - Bulk Density lbs/cu. ft. (Packed) |
105 |
Strontium Carbonate is a slightly soluble source of SrO used in glazes.
There is disagreement about when it decomposes (data sheets vary from 1075-1100C, one even indicates 1340C) as follows:
SrCO3 -> SrO + CO2
The 'Ceramic Industry Materials Handbook' states that it starts to disassociate as early as 800C in a purely oxidizing atmosphere, whereas a CO2 atmosphere might delay break-down until around 1220C. This information is supported by the fact that when the more stable calcium and barium carbonate are added to bodies, pinholing and blistering are greater than bodies containing strontium. Wikipedia says it melts and decomposes at the same time, 1100C.
Strontium carbonate is often recommended as a substitute for barium to produce matte glazes. Use about 75% as much and test first to make sure color response is the same. However strontium is not a substitute for barium as a precipitator of soluble salts in clay bodies because it combines with SO4-- ions in the water to form a compound that is not nearly as insoluble as BaSO4.
Viscous zirconium silicate glazes can be smoothed with the addition of strontium carbonate.
Strontium is considered a safe material. Some people confuse SrO with Strontium 90, an isotope released from atomic reactions, but they are not the same thing.
Strontium carbonate produces gases as it decomposes and these can cause pinholes or blisters in glazes. There are many strontium frits available and incorporating one of them to source the SrO instead is a classic application of ceramic chemistry calculations. The resultant glaze will be more fusible and will have better clarity and fewer defects.
Out Bound Links
In Bound Links
- (Hazards - Unspecified)
Strontium Carbonate Toxicity Note
Is there any radiation danger from using this mate... - (Oxides - Closest material equivalent)
SrO - Strontium Oxide, Strontia
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Strontium Carbonate" descrip="" searchkey="Strontianite" loi="0.00" casnumber="1633-05-2">
<oxides>
<oxide symbol="SrO" name="Strontium Oxide, Strontia" status="U" percent="70.200" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="CO2" name="Carbon Dioxide" percent="29.800" tolerance=""/>
</volatiles>
</material> | 
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