Strontium oxide
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| Names | |
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IUPAC name
Strontium oxide
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| Other names
Strontia
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| Identifiers | |
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3D model (Jmol)
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| ECHA InfoCard | 100.013.837 |
| EC Number | 215-219-9 |
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PubChem CID
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| Properties | |
| SrO | |
| Molar mass | 103.619 g/mol |
| Appearance | colorless cubic crystals |
| Density | 4.70 g/cm3 |
| Melting point | 2,531 °C (4,588 °F; 2,804 K) |
| Boiling point | 3,200 °C (5,790 °F; 3,470 K) (decomposes) |
| reacts, forms Sr(OH)2 | |
| Solubility | miscible with potassium hydroxide slightly soluble in alcohol insoluble in acetone and ether |
| −35.0·10−6 cm3/mol | |
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Refractive index (nD)
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1.810 |
| Structure | |
| Halite (cubic), cF8 | |
| Fm3m, No. 225 | |
| Octahedral (Sr2+); octahedral (O2−) | |
| Thermochemistry | |
| 44.3 J·mol−1·K−1 | |
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Std molar
entropy (S |
57.2 J·mol−1·K−1 |
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Std enthalpy of
formation (ΔfH |
-592.0 kJ·mol−1 |
| Hazards | |
| Flash point | Non-flammable |
| Related compounds | |
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Other anions
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Strontium sulfide |
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Other cations
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Beryllium oxide Magnesium oxide Calcium oxide Barium oxide |
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Related compounds
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Strontium hydroxide |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is   ?) |
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| Infobox references | |
Strontium oxide or strontia, SrO, is formed when strontium reacts with oxygen. Burning strontium in air results in a mixture of strontium oxide and strontium nitride. It also forms from the decomposition of strontium carbonate SrCO3. It is a strongly basic oxide.
About 8% by weight of cathode ray tubes is strontium oxide, which has been the major use of strontium since 1970. Color televisions and other devices containing color cathode ray tubes sold in the United States are required by law to use strontium in the faceplate to block X-ray emission (these X-ray emitting TV's are no longer in production). Lead(II) oxide can be used in the neck and funnel, but causes discoloration when used in the faceplate.
Elemental strontium is formed when strontium oxide is heated with aluminium in a vacuum.
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