Title: Polonium Dioxide
CAS Registry Number: 7446-06-2
Molecular Formula: O2Po
Molecular Weight: 240.98
Percent Composition: O 13.28%, Po 86.72%
Line Formula: PoO2
Literature References: Formed from the elements at 250°: Martin, J. Phys. Chem. 58, 911 (1954).
Properties: Two crystal modifications: yellow, low temperature form, face-centered cubic symmetry; red, high-temperature form, tetragonal symmetry. Darkens in color on heating, chocolate brown at sublimation temp of 885°. Dec into the elements at 500° under vacuum; slowly reduced to the metal in hydrogen at 200°. Heat of formation ~30 kcal/mole. Sol in aq solns of ammonium carbonate, phosphoric acid.
Status: This monograph has been retired and is no longer subject to revision or update. |