Chemistry:Radium sulfate

From HandWiki
Radium sulfate
3D model (JSmol)
Molar mass 322 g·mol−1
Related compounds
Other cations
strontium sulfate, barium sulfate, lead(II) sulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Radium sulfate (or radium sulphate) is an inorganic compound with the formula RaSO4 and an average molecular mass of 322.088 g/mol.[3] This salt is the least soluble of all known sulfate salts.[4] It was formerly used in radiotherapy and smoke detectors, but this has been phased out in favor of less hazardous alternatives.


Radium sulfate crystallises in a solid in the same structure as barium sulfate. It forms crystals in the orthorhombic crystal system, with a unit cell of dimensions a = 9.07 b=5.52 and c = 7.28 Å. The unit cell volume is 364 Å3. Distance from the radium ion to oxygen is 2.96  Å and the sulfur to oxygen bond length in the sulfate ion is 1.485  Å. In this compound the ionic radius of the radium ion is 1.66 Å, and it is in ten coordination.[5]

Radium sulfate can form solid solutions with the sulfates of strontium, barium or lead.[5]


  1. Chambers, Michael. "ChemIDplus - 7446-16-4 - MXQFUMUIEZBICJ-UHFFFAOYSA-L - Sulfuric acid, radium salt (1:1) - Similar structures search, synonyms, formulas, resource links, and other chemical information." (in en). 
  2. John Rumble (June 18, 2018) (in English). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–189. ISBN 978-1138561632. 
  3. "Radium sulfate | O4RaS | ChemSpider". 
  4. Kirby, H. W.; Salutsky, Murrell L. (1964). The Radiochemistry of Radium. National Academies Press. p. 12. 
  5. 5.0 5.1 Hedström, Hanna; Persson, Ingmar; Skarnemark, Gunnar; Ekberg, Christian (2013-05-22). "Characterization of Radium Sulphate". Journal of Nuclear Chemistry 2013: 1–4. doi:10.1155/2013/940701.