Strontium oxide
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Names | |
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IUPAC name Strontium oxide | |
Other names Strontia | |
Identifiers | |
3D model (JSmol) | |
ECHA InfoCard | 100.013.837 |
EC Number |
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PubChem CID | |
UNII | |
CompTox Dashboard (EPA) | |
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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) | 1.810 [2] |
Structure | |
Halite (cubic), cF8 | |
Fm3m, No. 225 | |
Octahedral (Sr2+); octahedral (O2−) | |
Thermochemistry | |
Heat capacity (C) | 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 | |
Flash point | Non-flammable |
Related compounds | |
Other anions | Strontium sulfide |
Other cations | Beryllium oxide Magnesium oxide Calcium oxide Barium oxide |
Related compounds | Strontium hydroxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
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
[edit]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
[edit]Elemental strontium is formed when strontium oxide is heated with aluminium in a vacuum.[1]
References
[edit]- ^ a b 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" (PDF). United States Geological Survey. Retrieved 2009-09-14.
- ^ Minerals Yearbook. Bureau of Mines. May 8, 2011. ISBN 9781411332270 – via Google Books.
- ^ Méar, F; Yot, P; Cambon, M; Ribes, M (2006). "The characterization of waste cathode-ray tube glass". Waste Management. 26 (12): 1468–76. Bibcode:2006WaMan..26.1468M. doi:10.1016/j.wasman.2005.11.017. ISSN 0956-053X. PMID 16427267.