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Strontium oxide

 
Sci-Tech Dictionary: strontium oxide
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(′strän·tē·əm ′äk′sīd)

(inorganic chemistry) SrO A grayish powder, melts at 2430°C, becomes the hydroxide in water; used in medicine, pyrotechnics, pigments, greases, soaps, and as a chemicals intermediate. Also known as strontia.

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Wikipedia: Strontium oxide
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Strontium oxide[1]
__ Sr2+     __ O2-
NaCl polyhedra.png
IUPAC name
Other names Strontia
Identifiers
CAS number 1314-11-0 Yes check.svgY
Properties
Molecular formula SrO
Molar mass 103.62 g/mol
Appearance colorless cubic crystals
Density 4.70 g/cm3
Melting point

2531°C
Boiling point

> 3000 °C (decomp)
Solubility in water reacts, forms Sr(OH)2
Solubility miscible with caustic potash
slightly soluble in alcohol
insoluble in acetone and ether
Refractive index (nD) 1.810 [2]
Structure
Crystal structure Halite (cubic), cF8
Space group Fm3m, No. 225
Coordination
geometry		 Octahedral (Sr2+); octahedral (O2–)
Thermochemistry
Std enthalpy of
formation ΔfHo298		 -592.0 kJ·mol-1
Standard molar
entropy So298		 57.2 J·mol-1·K-1
Specific heat capacity, C 44.3 J·mol-1·K-1
Hazards
EU Index Not listed
Flash point Non-flammable
Related compounds
Other anions Strontium sulfide
Other cations Beryllium oxide
Magnesium oxide
Calcium oxide
Barium oxide
Related compounds Strontium hydroxide
 Yes check.svgY (what is this?)  (verify)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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.

Contents

Uses

About 8% by weight of television picture tube glass is strontium oxide, which has been the major use of strontium since 1970.[3]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. (Lead oxide can be used in the neck and funnel, but causes discoloration when used in the faceplate.)[4]

Reactions

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

References

  1. ^ a b Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, FL: CRC Press. pp. 4–87. ISBN 0849305942. 
  2. ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0070494398
  3. ^ 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. Retrieved 2009-09-14. 
  4. ^ Méar, F; Yot, P; Cambon, M; Ribes, M (2006). "The characterization of waste cathode-ray tube glass.". Waste management (New York, N.Y.) 26 (12): 1468–76. doi:10.1016/j.wasman.2005.11.017. ISSN 0956-053X. PMID 16427267. 

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