Chemical compound

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][5] 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.[6]


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

Oxidation Numbers

The oxidation number of strontium is +2. The oxidation number of oxygen is -2.


  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. ^ Ropp, Richard C. (December 31, 2012). Encyclopedia of the Alkaline Earth Compounds. Newnes. ISBN 9780444595539 – via Google Books.
  5. ^ Minerals Yearbook. Bureau of Mines. May 8, 2011. ISBN 9781411332270 – via Google Books.
  6. ^ 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.

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