Neutron manganese dioxide

To synthesize Pa-233, thorium nitrate is irradiated with neutron. Pa-233 formed, as shown above, is dissolved in 3M nitric acid. The solution is heated. A manganous salt and permanganate are added to this solution. Manganese dioxide, Mn02, is precipitated. Pa-233 co-deposits onto this precipitate. The precipitate is washed with water. It is then dissolved in 6M hydrochloric acid. 

Modern inelastic neutron scattering technique has made it possible to discover free protons in solids [49] that is, free protons have been found in manganese dioxides, coals, graphite nitric acid intercalation compounds, polypyrolles and polyanilines, and fi-alumina. Perhaps the said compounds may be called protonic conductors as well, though in the solids the density of free protons is very small and the distribution of proton kinetic momentum is hidden by the zero-point oscillations of the host matrix [49]. 

Ammundesn B, Jones DJ, Rosiere J, Berg H, Tellgren, Thomas JO (1998) Ion exchange in manganese dioxide spinel proton, deuteron and lithium sites determined from neutron powder diffraction data Chem Mater 10 1680-1687... 

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