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| Names | |
|---|---|
| IUPAC name Strontium oxide | |
| Other names Strontia | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.013.837 |
| EC Number |
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| UNII | |
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| Properties | |
| SrO | |
| Molar mass | 103.619 g/mol |
| Appearance | colorlesscubic 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, formsSr(OH)2 | |
| Solubility | miscible withpotassium hydroxide slightly soluble inalcohol insoluble inacetone andether |
| −35.0·10−6 cm3/mol | |
Refractive index (nD) | 1.810[2] |
| Structure | |
| Halite (cubic),cF8 | |
| Fm3m, No. 225 | |
| Octahedral (Sr2+); octahedral (O2−) | |
| Thermochemistry | |
| 44.3 J·mol−1·K−1 | |
Std molar entropy(S⦵298) | 57.2 J·mol−1·K−1 |
Std enthalpy of formation(ΔfH⦵298) | −592.0 kJ·mol−1 |
| Hazards | |
| GHS labelling:[1] | |
 | |
| Danger | |
| H314 | |
| P260,P264,P264+P265,P280,P301+P330+P331,P302+P361+P354,P304+P340,P305+P354+P338,P316,P317,P321,P363,P405,P501 | |
| Flash point | Non-flammable |
| Related compounds | |
Otheranions | Strontium sulfide |
Othercations | Beryllium oxide Magnesium oxide Calcium oxide Barium oxide |
Related compounds | Strontium hydroxide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Strontium oxide orstrontia, SrO, is formed whenstrontium reacts withoxygen. Burning strontium in air results in a mixture of strontium oxide andstrontium nitride. It also forms from the decomposition ofstrontium carbonate SrCO3. It is a strongly basic oxide.
About 8% by weight ofcathode-ray tubes is strontium oxide, which has been the major use of strontium since 1970.[3][4] 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 blockX-ray emission (these X-ray emitting TVs are no longer in production).Lead(II) oxide can be used in the neck and funnel, but causes discoloration when used in the faceplate.[5]
Elemental strontium is formed when strontium oxide is heated withaluminium in a vacuum.[1]
