Chemistry: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 | |
3D model (JSmol)
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PubChem CID
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| UNII | |
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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 | |
Refractive index (nD)
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1.810 [2] |
| Structure | |
| Halite (cubic), cF8 | |
| Fm3m, No. 225 | |
| Octahedral (Sr2+); octahedral (O2−) | |
| Thermochemistry | |
Heat capacity (C)
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44.3 J·mol−1·K−1 |
Std molar
entropy (S |
57.2 J·mol−1·K−1 |
Std enthalpy of
formation (ΔfH⦵298) |
-592.0 kJ·mol−1 |
| Hazards | |
| Flash point | Non-flammable |
| Related compounds | |
Other anions
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Strontium sulfide |
Other cations
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Beryllium oxide Magnesium oxide Calcium oxide Barium oxide |
Related compounds
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Strontium hydroxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (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.
Uses
About 8% by weight of cathode 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 block X-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]
Reactions
Elemental strontium is formed when strontium oxide is heated with aluminium in a vacuum.[1]
References
- ↑ 1.0 1.1 Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–87. ISBN 0-8493-0594-2.
- ↑ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN:0-07-049439-8
- ↑ Ober, Joyce A.; Polyak, Désirée E.. "Mineral Yearbook 2007:Strontium". United States Geological Survey. http://minerals.usgs.gov/minerals/pubs/commodity/strontium/myb1-2007-stron.pdf.
- ↑ Minerals Yearbook. Bureau of Mines. May 8, 2011. ISBN 9781411332270. https://books.google.com/books?id=G6c7AQAAMAAJ&dq=faceplate+glass+production+%2C+strontium%27s+major+end+use+since+the+early+1970s&pg=RA6-SA74-PA1.
- ↑ Méar, F; Yot, P; Cambon, M; Ribes, M (2006). "The characterization of waste cathode-ray tube glass.". Waste Management 26 (12): 1468–76. doi:10.1016/j.wasman.2005.11.017. ISSN 0956-053X. PMID 16427267. Bibcode: 2006WaMan..26.1468M.
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