Strontium oxide

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.

Strontium oxide^[1]

__ Sr2+     __ O2−
Names
IUPAC name Strontium oxide
Other names Strontia
Identifiers
CAS Number	1314-11-0 Y
3D model (JSmol)	Interactive image
ECHA InfoCard	100.013.837
EC Number	215-219-9
PubChem CID	73975
UNII	64RA22280P Y
CompTox Dashboard (EPA)	DTXSID00893853
InChI InChI=1S/O.Sr/q-2;+2
SMILES [O-2].[Sr+2]
Properties
Chemical formula	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)
Solubility in water	reacts, forms Sr(OH)2
Solubility	miscible with potassium hydroxide slightly soluble in alcohol insoluble in acetone and ether
Magnetic susceptibility (χ)	−35.0·10−6 cm3/mol
Refractive index (nD)	1.810 [2]
Structure
Crystal structure	Halite (cubic), cF8
Space group	Fm3m, No. 225
Coordination geometry	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). N verify (what is YN ?) Infobox references

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]