Strontium oxide[1]
__ Sr2+     __ O2−
IUPAC name
Strontium oxide
Other names
3D model (JSmol)
ECHA InfoCard 100.013.837 Edit this at Wikidata
EC Number
  • 215-219-9
  • InChI=1S/O.Sr/q-2;+2
  • [O-2].[Sr+2]
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
1.810 [2]
Halite (cubic), cF8
Fm3m, No. 225
Octahedral (Sr2+); octahedral (O2−)
44.3 J·mol−1·K−1
57.2 J·mol−1·K−1
-592.0 kJ·mol−1
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).
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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.[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]


Elemental strontium is formed when strontium oxide is heated with aluminium in a vacuum.[1]


  1. ^ 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.
  2. ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
  3. ^ Ober, Joyce A.; Polyak, Désirée E. "Mineral Yearbook 2007:Strontium" (PDF). United States Geological Survey. Retrieved 2009-09-14.
  4. ^ Minerals Yearbook. Bureau of Mines. May 8, 2011. ISBN 9781411332270 – via Google Books.
  5. ^ 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.